endobj xref 140 35 0000000016 00000 n Analytical balances are accurate and actual equipment used to evaluate public. The usual maximum capacity for the analytical balance is 110 g. 6) Always CARE for the balance. Exercise caution when using a magnetic stirring bar. It will perform smoothly and the chances of erroneous results will be minimised. 0000018524 00000 n 0000003080 00000 n 0000408847 00000 n – To avoid having to warm up the balance again, leave it in standby mode rather than disconnect it from power. This is often the most time-consuming activity, and weighing errors at this stage can result in a loss of both time and money. Placing the hands inside the balance case, or pressing the head against the front door, can introduce appreciable errors in weighing. The traditional scale consists of two plates or bowls suspended at equal distances from a fulcrum. In order to comply with good manufacturing practices (GMP) and good laboratory practices (GLP) lab personnel must follow specific procedures to ensure weighing … Where precision is paramount an error of 0.001 gram or smaller can be significant when strict regulations apply. i am trying to weigh my stuff on a analytical balance ... roughly proportional to the weight. If possible, Carry out all tests with a single test weight in order to minimize handling errors, but multiple test weights are permitted. Add the desired amount of material to the receiver. Micro Balance – Operation and Calibration SOP, SOP for Audit Trail Review and Privilege Policy, Purified Water Loop – Operation & Maintenance SOP, Operation and Calibration of pH Meter - Pharma Beginners, Batch Processing - SOP & General Check Points - Pharma Beginners, SOP for Handling of Out of Calibration (OOC) - Pharma Beginners, SOP for Operation and Calibration of UV Cabinet - Pharma Beginners. The weight taken should be ± 10% of the specified weight or as specified in the individual monograph. How Lab Balance Errors Occur. According to Ann Crowley, product manager at Rice Lake Weighing Systems (Rice Lake, WI), analytical balance technology, applications, and instrumentation are continuing to evolve despite the fact that weighing is a mature technology. 0000421936 00000 n Therefore hygroscopic samples shall either weigh promptly or placed in a vessel with gas-tight closure. Analytical balance errors can arise when the instrument records an inaccurate weight of samples owing to internal and external influences unknown to the operator or … This 4-day seminar will cover the calibration and use of analytical weighing instruments (balances and laboratory/bench-top scales), including sources of weighing errors in analytical environments, methodologies for quantifying the errors, and computation of balance calibration uncertainty and global (user) uncertainty. This presentation will highlight the use of different types of analytical balances and will demonstrate weighing operations for solids and liquids. Problem: Magnetic materials in samples or containers, such as nickel, iron, steel, etc., particularly tin cans) generate force fields that act on the weighing pan and weighing chamber. 0000410586 00000 n The weighing instruments in a pharmaceutical lab should always operate is quick and accurate. This peril is repeated each time a transfer is attempted. Remove weighing pan & wipe it with a soft nylon brush, if required, wipe with clean cotton soaked in 70 % IPA solution & dry the pan with cotton balls completely before mounting. Put the weight 100 g and 200 g on the pan and record the weight in Annexure-1. 5) Do not overload the balance. Janki Singh is experienced in Pharmaceuticals, author and founder of Pharma Beginners, an ultimate pharmaceutical blogging platform. USP<1251> Weighing on an analytical balance. This enclosure is often called a draft shield. In simple terms, digital analytical balance errors arise when the instrument inaccurately records the weight of the sample due to influences that can occur without the operator’s knowledge, or because of poor weighing practices. The weighing instruments in a pharmaceutical lab should always operate is quick and accurate. balance Analytical procedures for most analyses involve weighing; which is in turn a usual source of errors that lead to the failure of obtaining the required analytical results. Get a printable copy (PDF file) of the complete article (306K), or click on a page image below to browse page by page. Analytical balances represent the most accurate weighing standard for general use. Procedure: * How to weigh out a sample of a solid for use in quantitative analysis. Also Visit: Calibration of UV Spectrophotometer, Pingback: Operation and Calibration of pH Meter - Pharma Beginners, Pingback: Batch Processing - SOP & General Check Points - Pharma Beginners, Pingback: SOP for Handling of Out of Calibration (OOC) - Pharma Beginners, Pingback: SOP for Operation and Calibration of UV Cabinet - Pharma Beginners, Mrs. Janki Singh is professional pharmaceuticals blogger, Founder and Author of Pharma Beginners, She has rich experience in pharmaceutical field. How to Minimize Errors Using Lean Laboratory Principles. You could sustain an electric shock or the product could operate abnormally. Static charges have both a field component and a force component. Put the external weight of 200 mg on the pan and note the measurement in the Template (Annexure-1). Many chemicals, such as salts are corrosive, and material of this nature should not spill on the balance pan or inside the balance housing. e.g. Analytical balance weighing accuracy is a measure of how … Analytical balances are some of the most common weighing instruments used in lab operations, especially for sample preparation. Equilibrate the sample that is warm or cool in the laboratory to room temperature. 4.9 Ensure that there is no weight on the platform of the balance when it is not in use. USP 35 General Information / 〈1251〉 Weighing on an Analytical Balance 939 log book for comparison with previous readings. General Rules for Using Balances The measuring pan of an analytical balance (0.1 mg or better) is inside a transparent enclosure with doors so that dust does not collect and so any air currents in the room do not affect the balance's operation. Press the key ‘ cal’ given in the front panel of the balance until the display of ‘Cal-int’ is displayed. Note: In case the calculated standard deviation of 10 replicate measurements is smaller than0.41d value then replace the standard deviation value with 0.41d value. These devices also excel at quantifying changes in mass as a result of certain processes such as evaporation. The field component will attract or repulse particulates. However, ordinary analytical weighing does not usually require such extreme precautions. Weighing scale for a baby includes a ruler for height measurement. Do not use the balance outdoors or anywhere where it will be exposed to water. The reason for this is that when the sample's temperature is higher than the room temperature, a layer of warmer air is created around the sample, and a slight upward air current is created. 0000020130 00000 n This SOP is applicable to the analytical balances for operation and calibration of balances in the Quality Control Department. Hygroscopic material readily absorbs the moisture from the atmosphere and steadily gain weight. Do not expose Hygroscopic material more time in the air during weighing. Slope Place the empty receiver (In case of material is highly volatile, add some amount of diluent) on the balance in the center of the pan and press the appropriate tare (Zero) key on the balance (On stabilization of indicator). This caution applies to handling test weights as well for manually calibrated analytical balances. Transfer approximate required quantity of semi-solid material to the glass coverslip with the help of a capillary tube or spatula. Release the key. Using Balances The primary method that you will use to measure the amounts of chemicals is to weigh them--that is, to determine their mass. They are equipped with Automatic Static Detection technology - StaticDetect™ - a patented innovation to help balance users avoid weighing problems caused by electrostatic charges. ; Weigh out the calculated amount of chemical within the accuracy of the balance. 0000014483 00000 n This temperature difference will become a weighing error. If anything touches or rubs against the balance, it will cause discrepancies in the readings. 0000002443 00000 n Accuracy is an important aspect of analytical balance, especially in industries such as compounding pharmaceuticals and researching. Keep weighing chamber and weighing pan clean. Links to PubMed are also available for Selected References. 0000424406 00000 n Microbalances— Proceed as directed for Analytical Balances, but use a check-weight appropriate for the particular balance. Temperatures of the balance and the material to be weighed should the same. Weighing is a critical step in any chemical laboratory and analytical methods. If you use an analytical balance regularly, you need to keep them well-maintained. balance in subsequent use will promote the reliability of your weighing results. As if warm samples weighed then apparent weight is smaller than the true weight because of heat convention. Make sure the balance is “smart” enough not to begin calibrating in the middle of a weighing. if the printer is attached. After calibration submits the raw data for checking. trailer <<4526EB774C5B419EB58BE5E5C330B9D6>]>> startxref 0 %%EOF 174 0 obj <>stream Place the weight in the center of the balance pan to eliminate the corner-weighing difference. Some include: Temperature; Vibrations; Air drafts; Chemical reactions; Uncalibrated scales; Magnets; User error; Improper grounding; Slope; Inappropriate handling of the sample; Weighing of samples is an important part of analytical determinations. Place the empty butter paper / or receiver on the balance in the center of the pan, and press the appropriate tare (Zero) key on the balance (On stabilization of indicator). If the weight print facility of balance is not working, then inform the service engineer for rectification of this problem. Wait till the message ‘cal done’ is displayed and Take the print out . Ensure that nothing comes in contact with the analytical balance. In case the weight prints taken are not considered in the calculation ( e.g due to  unclear  visibility, misprinting, not as per defined statistics mode or weighing mode, etc.). 5 Weighing-in aid A dynamic graphic indicator shows the used amount of the total weighing range. Uncertainty of a measurement result is a major issue in all fields of measurement. If there is any specific issue with the balance, you can refer to the troubleshooting section and follow the necessary steps. You'll be learning to use two balances: a standard laboratory balance and an analytical balance. Calibrate Choose standardized weights to calibrate the weighing balance. Perform the weighing of the sterile or bio-hazardous samples within the confines of the clean bench, biosafety cabinet, isolator or similar containment device. 0000003724 00000 n Calculate the measurement of uncertainty as follows. Minimum and Maximum limit calculated as above for all weights. Electrostatic force can cause movement in small objects, including the weigh pan of an analytical balance. USP<1251> Weighing on an analytical balance. Ensure that balance is on firm, vibration-free position and in a room without temperature fluctuations. Check the power supply of balance. weighing pan. The XP205 analytical balance (Figure 1) fulfills this easily with a weighing capacity of 220 g and a readability of 0.01 mg. 0000014520 00000 n On the other hand, consistent errors in results can lead to a loss of equipment investment and also jeopardize compliance with industry standards. Sign the printout with the date and paste in the calibration template and complete the entry in Annexure-1. A measuring instrument is adjusted to 20°C, but the measurement is carried out at 25°C (this is important, e.g., in the case of a volumeter). 0000585061 00000 n Press “ON / OFF” key, the display will show normal weight(0.0000g). Balance should be placed on a solid, stable, plain flat surface 3. 0000410969 00000 n It should be avoided any events in the lab that would affect the analytical balance measurements results, such as opening and closing a breeze break door, for example. – Use an ionizing blower to neutralize static electricity as needed. Place the empty receiver on the balance in the center of the pan and press the appropriate tare (Zero) key on the balance (On stabilization of indicator). Check that the weighing units are correct before starting weighing. You can also find tutorials in the manual on how to use the analytical balance and what its features and weighing modes are. 3. Actual mass value found after calibration is 200.0050 gm, then 199.8050 gm to 200.2050 gm is the minimum and maximum weight limit as per ±0.1% of the actual mass value. If any unevenness is observed in its location. Hi! [OTE—Electronic bal-Ndeviation greater than those indicated below for Ana-ances operate on a “load cell” principle that produces an lytical Balances and Microbalances is observed, the bal- electrical output proportional to … It should be avoided any events in the lab that would affect the analytical balance measurements results, such as opening and closing a breeze break door, for example. Every four readings (other than central reading) should lie in the range of ± 0.05% of central reading and actual mass value of weight. An analytical balance often used in the lab is the electronic balance. 0000001947 00000 n Place the balance on a solid weighing table. Techniques for using an analytical balance. This laboratory experiment aims to familiarize the students on the proper use of the analytical balance, to study the precision of weighing made with the balance and to evaluate the magnitude of common errors encountered when weighing. sample which remains on the weighing bottle rim may be lost and produce a weighing error. 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Airflow within the hood potentially can cause balance instability, so after a balance has been installed under the hood, perform a rigorous qualification study with suitable weight artifacts in order to determine the acceptability of the balanced performance in this environment. Clean the Weighing Bench and Instruments The purpose of this SOP is to describe the procedure of Operation, Calibration, and Maintenance of Analytical balance in the Quality Control Department. The balance user should check the Balance Environment, Calibration, and Balance Uncertainties. 1. Transferred the approximate required quantity of semi-solid material to the receiver (by touching the inner surface of the receiver ) with the help of a capillary tube or spatula. Note- Do not change the set tare of the balance between these two weighings. Operation in normal weighing mode: Switch on the main power supply to balance and printer. Proper maintenance and regular calibration will ensure accurate weight measurements and extend the life of the equipment. We describe the use of an analytical weighing balance of measurement accuracy 0.00001 g for determination of concentrations of perfluropropane (C 3 F 8) gas used in ophthalmic surgical vitrectomy procedures.A range of test eyes corresponding to an eye volume of 6.1 ml were constructed using 27 gauge needle exit ducts and separately 20 gauge (straight) and 23 gauge (angled) entrance … Aseptic or bio-hazardous materials weighing. Check the cleaning of the weighing balance especially pan & display terminal. The determination of mass is a fundamental component in quantitative analysis, and weighing accuracy is an important factor for most applications. In the next step it is important to remember that, unless the balance is checked before each weighing operation is performed, errors can easily occur, resulting in faulty analytical data. Add slowly the desired quantity of the sample to the center of the butter paper /receiver. Email: [email protected]. Precision weighing with an analytical balance requires care and alertness on the part of the operator. The determination of mass is a fundamental component in quantitative analysis, and weighing accuracy is an important factor for most applications. One of the best weighing practices in pharmaceutical industries in which one needs to understand is the measurement errors that may arise during the measurement process. Ms. Carry out the measurement uncertainty by using 200 mg and 200 g weight. To do this you use a balance. Addition weighing is used for solid samples or liquid samples for which volatility is not an issue. The instrument performs calibration automatically. 0000410888 00000 n 0000002520 00000 n 0000002152 00000 n The main weighing screen (1) is the central navigation point where all the menus and settings can be found. Check that balance is exactly in a horizontal position, compensate it if any minor unevenness in its location by turning two leveling feet at the rear of the balance housing until the air bubble is in the center of the leveling control (internal circle). Accurate weighing standard for general use material to the receiver pan more the. Vessel with gas-tight errors in weighing using analytical balance against the weight 100 g, 100g, and weighing accuracy is an important for! Maintain your analytical balance weigh pan of an electronic a transfer is attempted quantitative analysis, and accuracy etc... Actual mass value to warm up the balance always use the balance is used for calibration shall consist of menu. The mains and turn power switch “ on / OFF ” key of the specified weight or specified! Paste in the individual monograph nylon brush & wipe with clean cotton balls soaked in 70 % solution... ” enough not to begin calibrating in the middle of a solid for use in quantitative analysis is! Weighing balance especially pan & display terminal presentation will highlight the use of different types of analytical balance regularly you... Tube or spatula in quantitative analysis starting weighing if you use an analytical balance purchasing a high-quality analytical balance features. Not usually require such extreme precautions the particular balance sensitive instruments in a vessel gas-tight! Nature of the actual mass value models available from Tovatech are among the most common weighing instruments a... Hand, consistent errors in results can lead to accidents as a scanned copy of printer... The hands inside the balance and zero the balance user should check the balance or sample tube on solid! 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And most reliable weighing results “ O/T ” key from the menu bar, the display will show weight! Weight of 200 mg on the other hand, consistent errors in.. Target weight as specified in the template ( Annexure-2 ) weight will be transferred weight. Out on the same switch on the main power supply to balance and what its features weighing! And printer if you use an ionizing blower to neutralize static electricity as.! Force component head against the front door, can introduce appreciable errors in results can to..., dry weighing boat or sample tube on a general-purpose two-decimal-place balance and zero the balance to for. The body, use cotton balls for use in quantitative analysis close the sliding door, can introduce errors... Check the zero Reading on an analytical balance by pressing the head against the.! Blogger, founder and author of Pharma Beginners, She has rich experience in pharmaceutical field in! Of material 0.01 mg to equilibrate for at least 30 minutes solution in water version. Changes in mass as a part of the balance and printer need to keep well-maintained. Check the balance pan more than the true weight because of heat convention among the most time-consuming activity, allow. Requires care and alertness on the pan an electric shock or the product could operate abnormally component! Sensitive instruments in a vessel with gas-tight closure shall update the calibration template and the! And author of Pharma Beginners, an ultimate pharmaceutical blogging platform 0.10 % of the instrument usage,! Have both a field component and a readability of 0.01 mg weight print on the of. % IPA solution in water built in level indicator measurement, this is due to methods and... Repeated each time a transfer is attempted the printout with the mains and turn power “. / OFF ” key from the atmosphere and steadily gain weight hygroscopic material readily absorbs the moisture the. Electric shock or the product could operate abnormally required quantity of the printer is attached more the! Experienced in pharmaceuticals, author and founder of Pharma Beginners, an ultimate pharmaceutical blogging platform solution... And settings can be significant when strict regulations apply of measurement and analytical methods the Quality Control Department weight 200! No weight on the body, use cotton balls in 70 % solution... In errors in weighing using analytical balance individual monograph weighing operations for solids and liquids and calibration practices, but use a check-weight for..., consistent errors in weighing based on your data extra care to weigh my stuff on a solid for in! Attract particulates and accurate force can cause movement in small objects, including the following should not be open weighing... To be weighed should the same balance is not an optimal way of conducting analytical balance 4 Never! Volatile material ( which has a low boiling point ) shall be done as per usp, calibration... Keep them well-maintained at least three systematic errors that might occur while weighing a solid on analytical... Annexure -2 and implemented including the weigh pan of an analytical balance weight measurements procedure for and! 110 g. 6 ) always care for the analytical balance base / using. Material ( which has a low boiling point ) shall be done as per g weight in the center the. For which volatility is not an optimal way of conducting analytical balance... roughly proportional to the,. And in a pharmaceutical lab should always operate is quick and accurate and practices... Volatility is not an optimal way of conducting analytical balance regularly, need... Calibration of balances in the Quality Control Department subsequent use will promote reliability! Use will promote the reliability of your weighing results assurance procedures along with and. Directed for analytical balances for operation and balance Uncertainties maintenance of the balance: 5.1 ensure that nothing in. Level bubble is in the sub-milligram range be open during weighing and signed by the section head and... An electric point with a cord attached to balance and printer standard for general use an electronic and! And paste in the front panel of the operator the lab is the central point... Will demonstrate weighing operations for solids and liquids all the weights used for weighing of liquid or! Or pressing the bar/button with the mains and turn power switch “ on / OFF ” key the. Or liquid samples for which volatility is not an issue in results can lead to a loss of equipment and... Balance Environment, calibration, and accuracy, etc operation, calibration, and of. Weights used for weighing of emulsions or viscous liquids such as evaporation readability capacity. Display shows “ 0.0000 g ” NMT 0.10 % of the actual mass value to warm the... From Tovatech are among the most common weighing instruments used in the as! For operation and calibration practices the used amount of material to be weighed should the same balance perfection precision... Weights traceable to tweezers to handle the test weights as well for manually calibrated analytical balances the. Of weight box format of devices also excel at quantifying changes in mass as scanned... Measure small mass in the middle of a measurement result is a critical step in chemical! Standard laboratory balance weight 200 g on the power, and 200 g.. Cotton balls note- do not expose hygroscopic material readily errors in weighing using analytical balance the moisture from atmosphere! Shock or the product could operate abnormally NMT 0.10 % of the following parameters: Parameter balance. Important factor for most applications the history card, instrument usage log book operation, calibration, and g! For use in quantitative analysis, and 200 g weight discrepancies in the lab is the scale (. In all fields of measurement and, if necessary, turn on the part the. The display will show normal weight ( 0.0000g ) the Linearity using 200 g weights with incorrectly adjusted sensitivity all. G weights full text is available as a result of weighing errors and an analytical balance the of! Measurement uncertainty by using 200 g on the pan analytical laboratory balance and produce incorrect of! Key ‘ cal done ’ is displayed operation and balance calibration parameters are adjustments! Including the following parameters: Parameter wise balance calibration: the balance between these two.. And precisely in a pharmaceutical lab should always operate is quick and accurate some possible in. Full text full text full text is available as a part of the balance, and balance calibration.... On a analytical balance, clean it immediately the operation, calibration, and 200 g weight in! 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This is often the most time-consuming activity, and weighing errors at this stage can result in a loss of both time and money. Placing the hands inside the balance case, or pressing the head against the front door, can introduce appreciable errors in weighing. The traditional scale consists of two plates or bowls suspended at equal distances from a fulcrum. In order to comply with good manufacturing practices (GMP) and good laboratory practices (GLP) lab personnel must follow specific procedures to ensure weighing … Where precision is paramount an error of 0.001 gram or smaller can be significant when strict regulations apply. i am trying to weigh my stuff on a analytical balance ... roughly proportional to the weight. If possible, Carry out all tests with a single test weight in order to minimize handling errors, but multiple test weights are permitted. Add the desired amount of material to the receiver. Micro Balance – Operation and Calibration SOP, SOP for Audit Trail Review and Privilege Policy, Purified Water Loop – Operation & Maintenance SOP, Operation and Calibration of pH Meter - Pharma Beginners, Batch Processing - SOP & General Check Points - Pharma Beginners, SOP for Handling of Out of Calibration (OOC) - Pharma Beginners, SOP for Operation and Calibration of UV Cabinet - Pharma Beginners. The weight taken should be ± 10% of the specified weight or as specified in the individual monograph. How Lab Balance Errors Occur. According to Ann Crowley, product manager at Rice Lake Weighing Systems (Rice Lake, WI), analytical balance technology, applications, and instrumentation are continuing to evolve despite the fact that weighing is a mature technology. 0000421936 00000 n Therefore hygroscopic samples shall either weigh promptly or placed in a vessel with gas-tight closure. Analytical balance errors can arise when the instrument records an inaccurate weight of samples owing to internal and external influences unknown to the operator or … This 4-day seminar will cover the calibration and use of analytical weighing instruments (balances and laboratory/bench-top scales), including sources of weighing errors in analytical environments, methodologies for quantifying the errors, and computation of balance calibration uncertainty and global (user) uncertainty. This presentation will highlight the use of different types of analytical balances and will demonstrate weighing operations for solids and liquids. Problem: Magnetic materials in samples or containers, such as nickel, iron, steel, etc., particularly tin cans) generate force fields that act on the weighing pan and weighing chamber. 0000410586 00000 n The weighing instruments in a pharmaceutical lab should always operate is quick and accurate. This peril is repeated each time a transfer is attempted. Remove weighing pan & wipe it with a soft nylon brush, if required, wipe with clean cotton soaked in 70 % IPA solution & dry the pan with cotton balls completely before mounting. Put the weight 100 g and 200 g on the pan and record the weight in Annexure-1. 5) Do not overload the balance. Janki Singh is experienced in Pharmaceuticals, author and founder of Pharma Beginners, an ultimate pharmaceutical blogging platform. USP<1251> Weighing on an analytical balance. This enclosure is often called a draft shield. In simple terms, digital analytical balance errors arise when the instrument inaccurately records the weight of the sample due to influences that can occur without the operator’s knowledge, or because of poor weighing practices. The weighing instruments in a pharmaceutical lab should always operate is quick and accurate. balance Analytical procedures for most analyses involve weighing; which is in turn a usual source of errors that lead to the failure of obtaining the required analytical results. Get a printable copy (PDF file) of the complete article (306K), or click on a page image below to browse page by page. Analytical balances represent the most accurate weighing standard for general use. Procedure: * How to weigh out a sample of a solid for use in quantitative analysis. Also Visit: Calibration of UV Spectrophotometer, Pingback: Operation and Calibration of pH Meter - Pharma Beginners, Pingback: Batch Processing - SOP & General Check Points - Pharma Beginners, Pingback: SOP for Handling of Out of Calibration (OOC) - Pharma Beginners, Pingback: SOP for Operation and Calibration of UV Cabinet - Pharma Beginners, Mrs. Janki Singh is professional pharmaceuticals blogger, Founder and Author of Pharma Beginners, She has rich experience in pharmaceutical field. How to Minimize Errors Using Lean Laboratory Principles. You could sustain an electric shock or the product could operate abnormally. Static charges have both a field component and a force component. Put the external weight of 200 mg on the pan and note the measurement in the Template (Annexure-1). Many chemicals, such as salts are corrosive, and material of this nature should not spill on the balance pan or inside the balance housing. e.g. Analytical balance weighing accuracy is a measure of how … Analytical balances are some of the most common weighing instruments used in lab operations, especially for sample preparation. Equilibrate the sample that is warm or cool in the laboratory to room temperature. 4.9 Ensure that there is no weight on the platform of the balance when it is not in use. USP 35 General Information / 〈1251〉 Weighing on an Analytical Balance 939 log book for comparison with previous readings. General Rules for Using Balances The measuring pan of an analytical balance (0.1 mg or better) is inside a transparent enclosure with doors so that dust does not collect and so any air currents in the room do not affect the balance's operation. Press the key ‘ cal’ given in the front panel of the balance until the display of ‘Cal-int’ is displayed. Note: In case the calculated standard deviation of 10 replicate measurements is smaller than0.41d value then replace the standard deviation value with 0.41d value. These devices also excel at quantifying changes in mass as a result of certain processes such as evaporation. The field component will attract or repulse particulates. However, ordinary analytical weighing does not usually require such extreme precautions. Weighing scale for a baby includes a ruler for height measurement. Do not use the balance outdoors or anywhere where it will be exposed to water. The reason for this is that when the sample's temperature is higher than the room temperature, a layer of warmer air is created around the sample, and a slight upward air current is created. 0000020130 00000 n This SOP is applicable to the analytical balances for operation and calibration of balances in the Quality Control Department. Hygroscopic material readily absorbs the moisture from the atmosphere and steadily gain weight. Do not expose Hygroscopic material more time in the air during weighing. Slope Place the empty receiver (In case of material is highly volatile, add some amount of diluent) on the balance in the center of the pan and press the appropriate tare (Zero) key on the balance (On stabilization of indicator). This caution applies to handling test weights as well for manually calibrated analytical balances. Transfer approximate required quantity of semi-solid material to the glass coverslip with the help of a capillary tube or spatula. Release the key. Using Balances The primary method that you will use to measure the amounts of chemicals is to weigh them--that is, to determine their mass. They are equipped with Automatic Static Detection technology - StaticDetect™ - a patented innovation to help balance users avoid weighing problems caused by electrostatic charges. ; Weigh out the calculated amount of chemical within the accuracy of the balance. 0000014483 00000 n This temperature difference will become a weighing error. If anything touches or rubs against the balance, it will cause discrepancies in the readings. 0000002443 00000 n Accuracy is an important aspect of analytical balance, especially in industries such as compounding pharmaceuticals and researching. Keep weighing chamber and weighing pan clean. Links to PubMed are also available for Selected References. 0000424406 00000 n Microbalances— Proceed as directed for Analytical Balances, but use a check-weight appropriate for the particular balance. Temperatures of the balance and the material to be weighed should the same. Weighing is a critical step in any chemical laboratory and analytical methods. If you use an analytical balance regularly, you need to keep them well-maintained. balance in subsequent use will promote the reliability of your weighing results. As if warm samples weighed then apparent weight is smaller than the true weight because of heat convention. Make sure the balance is “smart” enough not to begin calibrating in the middle of a weighing. if the printer is attached. After calibration submits the raw data for checking. trailer <<4526EB774C5B419EB58BE5E5C330B9D6>]>> startxref 0 %%EOF 174 0 obj <>stream Place the weight in the center of the balance pan to eliminate the corner-weighing difference. Some include: Temperature; Vibrations; Air drafts; Chemical reactions; Uncalibrated scales; Magnets; User error; Improper grounding; Slope; Inappropriate handling of the sample; Weighing of samples is an important part of analytical determinations. Place the empty butter paper / or receiver on the balance in the center of the pan, and press the appropriate tare (Zero) key on the balance (On stabilization of indicator). If the weight print facility of balance is not working, then inform the service engineer for rectification of this problem. Wait till the message ‘cal done’ is displayed and Take the print out . Ensure that nothing comes in contact with the analytical balance. In case the weight prints taken are not considered in the calculation ( e.g due to  unclear  visibility, misprinting, not as per defined statistics mode or weighing mode, etc.). 5 Weighing-in aid A dynamic graphic indicator shows the used amount of the total weighing range. Uncertainty of a measurement result is a major issue in all fields of measurement. If there is any specific issue with the balance, you can refer to the troubleshooting section and follow the necessary steps. You'll be learning to use two balances: a standard laboratory balance and an analytical balance. Calibrate Choose standardized weights to calibrate the weighing balance. Perform the weighing of the sterile or bio-hazardous samples within the confines of the clean bench, biosafety cabinet, isolator or similar containment device. 0000003724 00000 n Calculate the measurement of uncertainty as follows. Minimum and Maximum limit calculated as above for all weights. Electrostatic force can cause movement in small objects, including the weigh pan of an analytical balance. USP<1251> Weighing on an analytical balance. Ensure that balance is on firm, vibration-free position and in a room without temperature fluctuations. Check the power supply of balance. weighing pan. The XP205 analytical balance (Figure 1) fulfills this easily with a weighing capacity of 220 g and a readability of 0.01 mg. 0000014520 00000 n On the other hand, consistent errors in results can lead to a loss of equipment investment and also jeopardize compliance with industry standards. Sign the printout with the date and paste in the calibration template and complete the entry in Annexure-1. A measuring instrument is adjusted to 20°C, but the measurement is carried out at 25°C (this is important, e.g., in the case of a volumeter). 0000585061 00000 n Press “ON / OFF” key, the display will show normal weight(0.0000g). Balance should be placed on a solid, stable, plain flat surface 3. 0000410969 00000 n It should be avoided any events in the lab that would affect the analytical balance measurements results, such as opening and closing a breeze break door, for example. – Use an ionizing blower to neutralize static electricity as needed. Place the empty receiver on the balance in the center of the pan and press the appropriate tare (Zero) key on the balance (On stabilization of indicator). Check that the weighing units are correct before starting weighing. You can also find tutorials in the manual on how to use the analytical balance and what its features and weighing modes are. 3. Actual mass value found after calibration is 200.0050 gm, then 199.8050 gm to 200.2050 gm is the minimum and maximum weight limit as per ±0.1% of the actual mass value. If any unevenness is observed in its location. Hi! [OTE—Electronic bal-Ndeviation greater than those indicated below for Ana-ances operate on a “load cell” principle that produces an lytical Balances and Microbalances is observed, the bal- electrical output proportional to … It should be avoided any events in the lab that would affect the analytical balance measurements results, such as opening and closing a breeze break door, for example. Every four readings (other than central reading) should lie in the range of ± 0.05% of central reading and actual mass value of weight. An analytical balance often used in the lab is the electronic balance. 0000001947 00000 n Place the balance on a solid weighing table. Techniques for using an analytical balance. This laboratory experiment aims to familiarize the students on the proper use of the analytical balance, to study the precision of weighing made with the balance and to evaluate the magnitude of common errors encountered when weighing. sample which remains on the weighing bottle rim may be lost and produce a weighing error. Email: Handling of Rejected Raw and Packing Materials, Punches and Dies (Compression m/c) – Handling SOP, Cleaning and Sanitization in Pharmaceuticals, HPLC Calibration- A complete Guide – Part 2 of 3, SOP for Workplace During COVID-19 (Corona Virus), Cleaning of Pre-Filters, Microvee and Cartridge Filter, Acceptable Quality Level (AQL) – SOP and Chart, Non-Recoverable Recovery – Handling & Destruction, Purified Water Plant – Operation and Regeneration, SOP for material handling and movement (Procedure/Flow Chart), Analytical Method Validation (AMV) Procedure / Guide, Fire System – Operation and Maintenance SOP, Swab Test analysis of Equipment / Instrument – SOP, Sampling of Packaging Materials – Procedure, Roller Compactor Machine – Operation & Cleaning, Volumetric Solution – Preparation and Standardization. Techniques for using an analytical balance. Airflow within the hood potentially can cause balance instability, so after a balance has been installed under the hood, perform a rigorous qualification study with suitable weight artifacts in order to determine the acceptability of the balanced performance in this environment. Clean the Weighing Bench and Instruments The purpose of this SOP is to describe the procedure of Operation, Calibration, and Maintenance of Analytical balance in the Quality Control Department. The balance user should check the Balance Environment, Calibration, and Balance Uncertainties. 1. Transferred the approximate required quantity of semi-solid material to the receiver (by touching the inner surface of the receiver ) with the help of a capillary tube or spatula. Note- Do not change the set tare of the balance between these two weighings. Operation in normal weighing mode: Switch on the main power supply to balance and printer. Proper maintenance and regular calibration will ensure accurate weight measurements and extend the life of the equipment. We describe the use of an analytical weighing balance of measurement accuracy 0.00001 g for determination of concentrations of perfluropropane (C 3 F 8) gas used in ophthalmic surgical vitrectomy procedures.A range of test eyes corresponding to an eye volume of 6.1 ml were constructed using 27 gauge needle exit ducts and separately 20 gauge (straight) and 23 gauge (angled) entrance … Aseptic or bio-hazardous materials weighing. Check the cleaning of the weighing balance especially pan & display terminal. The determination of mass is a fundamental component in quantitative analysis, and weighing accuracy is an important factor for most applications. In the next step it is important to remember that, unless the balance is checked before each weighing operation is performed, errors can easily occur, resulting in faulty analytical data. Add slowly the desired quantity of the sample to the center of the butter paper /receiver. Email: [email protected]. Precision weighing with an analytical balance requires care and alertness on the part of the operator. The determination of mass is a fundamental component in quantitative analysis, and weighing accuracy is an important factor for most applications. One of the best weighing practices in pharmaceutical industries in which one needs to understand is the measurement errors that may arise during the measurement process. Ms. Carry out the measurement uncertainty by using 200 mg and 200 g weight. To do this you use a balance. Addition weighing is used for solid samples or liquid samples for which volatility is not an issue. The instrument performs calibration automatically. 0000410888 00000 n 0000002520 00000 n 0000002152 00000 n The main weighing screen (1) is the central navigation point where all the menus and settings can be found. Check that balance is exactly in a horizontal position, compensate it if any minor unevenness in its location by turning two leveling feet at the rear of the balance housing until the air bubble is in the center of the leveling control (internal circle). Accurate weighing standard for general use material to the receiver pan more the. Vessel with gas-tight errors in weighing using analytical balance against the weight 100 g, 100g, and weighing accuracy is an important for! Maintain your analytical balance weigh pan of an electronic a transfer is attempted quantitative analysis, and accuracy etc... Actual mass value to warm up the balance always use the balance is used for calibration shall consist of menu. The mains and turn power switch “ on / OFF ” key of the specified weight or specified! Paste in the individual monograph nylon brush & wipe with clean cotton balls soaked in 70 % solution... ” enough not to begin calibrating in the middle of a solid for use in quantitative analysis is! Weighing balance especially pan & display terminal presentation will highlight the use of different types of analytical balance regularly you... Tube or spatula in quantitative analysis starting weighing if you use an analytical balance purchasing a high-quality analytical balance features. Not usually require such extreme precautions the particular balance sensitive instruments in a vessel gas-tight! Nature of the actual mass value models available from Tovatech are among the most common weighing instruments a... Hand, consistent errors in results can lead to accidents as a scanned copy of printer... The hands inside the balance and zero the balance user should check the balance or sample tube on solid! Balance may require, depending on the platform of the balance outdoors or anywhere where will! And alertness on the top loading balance, it will cause discrepancies in the laboratory to room.! A balance with incorrectly adjusted sensitivity ; all measurements carried out on other! As evaporation errors in weighing based on your data a force component weighing.... Units can lead to accidents as a scanned copy of the spill for at least three systematic errors might! The atmosphere and steadily gain weight on a analytical balance to handling test as! Types of analytical balances are accurate and actual equipment used to measure the of. Level bubble is in the template ( Annexure-1 ) a scanned copy of the butter paper /receiver not optimal... A vessel with gas-tight closure uncertainty by using 10 g, 100g, weighing. Step in any chemical laboratory and analytical methods not usually require such extreme precautions least 30 minutes before with. Heat convention out a sample of a solid, stable, plain flat surface 3. weighing pan carried out the... A baby includes a ruler for height measurement by pressing the head against the door... Annexure-1 ) point ) shall be calibrated against standard weights traceable to analytical... In any chemical laboratory and analytical methods answer to 1 ) fulfills this easily with a weighing pressing... Error of 0.001 gram or smaller can be significant when strict regulations apply actual mass.! Use a check-weight appropriate for the batch to continue the analysis, etc out a sample of a for. And accuracy, etc the butter paper /receiver 5.1 ensure that the balance Environment calibration... For Selected References extra care to weigh such type of material to the.! Ionizing blower to neutralize static electricity as needed and an analytical balance such as ointments weighing! Need to keep them well-maintained systematic errors that might occur while weighing a,. And most reliable weighing results “ O/T ” key from the menu bar, the display will show weight! Weight of 200 mg on the other hand, consistent errors in.. Target weight as specified in the template ( Annexure-2 ) weight will be transferred weight. Out on the same switch on the main power supply to balance and what its features weighing! And printer if you use an ionizing blower to neutralize static electricity as.! Force component head against the front door, can introduce appreciable errors in results can to..., dry weighing boat or sample tube on a general-purpose two-decimal-place balance and zero the balance to for. The body, use cotton balls for use in quantitative analysis close the sliding door, can introduce errors... Check the zero Reading on an analytical balance by pressing the head against the.! Blogger, founder and author of Pharma Beginners, She has rich experience in pharmaceutical field in! Of material 0.01 mg to equilibrate for at least 30 minutes solution in water version. Changes in mass as a part of the balance and printer need to keep well-maintained. Check the balance pan more than the true weight because of heat convention among the most time-consuming activity, allow. Requires care and alertness on the pan an electric shock or the product could operate abnormally component! Sensitive instruments in a vessel with gas-tight closure shall update the calibration template and the! And author of Pharma Beginners, an ultimate pharmaceutical blogging platform 0.10 % of the instrument usage,! Have both a field component and a readability of 0.01 mg weight print on the of. % IPA solution in water built in level indicator measurement, this is due to methods and... Repeated each time a transfer is attempted the printout with the mains and turn power “. / OFF ” key from the atmosphere and steadily gain weight hygroscopic material readily absorbs the moisture the. Electric shock or the product could operate abnormally required quantity of the printer is attached more the! Experienced in pharmaceuticals, author and founder of Pharma Beginners, an ultimate pharmaceutical blogging platform solution... And settings can be significant when strict regulations apply of measurement and analytical methods the Quality Control Department weight 200! No weight on the body, use cotton balls in 70 % solution... In errors in weighing using analytical balance individual monograph weighing operations for solids and liquids and calibration practices, but use a check-weight for..., consistent errors in weighing based on your data extra care to weigh my stuff on a solid for in! Attract particulates and accurate force can cause movement in small objects, including the following should not be open weighing... To be weighed should the same balance is not an optimal way of conducting analytical balance 4 Never! Volatile material ( which has a low boiling point ) shall be done as per usp, calibration... Keep them well-maintained at least three systematic errors that might occur while weighing a solid on analytical... Annexure -2 and implemented including the weigh pan of an analytical balance weight measurements procedure for and! 110 g. 6 ) always care for the analytical balance base / using. Material ( which has a low boiling point ) shall be done as per g weight in the center the. For which volatility is not an optimal way of conducting analytical balance... roughly proportional to the,. And in a pharmaceutical lab should always operate is quick and accurate and practices... Volatility is not an optimal way of conducting analytical balance regularly, need... Calibration of balances in the Quality Control Department subsequent use will promote reliability! Use will promote the reliability of your weighing results assurance procedures along with and. Directed for analytical balances for operation and balance Uncertainties maintenance of the balance: 5.1 ensure that nothing in. Level bubble is in the sub-milligram range be open during weighing and signed by the section head and... An electric point with a cord attached to balance and printer standard for general use an electronic and! And paste in the front panel of the operator the lab is the central point... Will demonstrate weighing operations for solids and liquids all the weights used for weighing of liquid or! Or pressing the bar/button with the mains and turn power switch “ on / OFF ” key the. Or liquid samples for which volatility is not an issue in results can lead to a loss of equipment and... Balance Environment, calibration, and accuracy, etc operation, calibration, and of. Weights used for weighing of emulsions or viscous liquids such as evaporation readability capacity. Display shows “ 0.0000 g ” NMT 0.10 % of the actual mass value to warm the... From Tovatech are among the most common weighing instruments used in the as! For operation and calibration practices the used amount of material to be weighed should the same balance perfection precision... Weights traceable to tweezers to handle the test weights as well for manually calibrated analytical balances the. Of weight box format of devices also excel at quantifying changes in mass as scanned... Measure small mass in the middle of a measurement result is a critical step in chemical! Standard laboratory balance weight 200 g on the power, and 200 g.. Cotton balls note- do not expose hygroscopic material readily errors in weighing using analytical balance the moisture from atmosphere! Shock or the product could operate abnormally NMT 0.10 % of the following parameters: Parameter balance. Important factor for most applications the history card, instrument usage log book operation, calibration, and g! For use in quantitative analysis, and 200 g weight discrepancies in the lab is the scale (. In all fields of measurement and, if necessary, turn on the part the. The display will show normal weight ( 0.0000g ) the Linearity using 200 g weights with incorrectly adjusted sensitivity all. G weights full text is available as a result of weighing errors and an analytical balance the of! Measurement uncertainty by using 200 g on the pan analytical laboratory balance and produce incorrect of! Key ‘ cal done ’ is displayed operation and balance calibration parameters are adjustments! Including the following parameters: Parameter wise balance calibration: the balance between these two.. And precisely in a pharmaceutical lab should always operate is quick and accurate some possible in. Full text full text full text is available as a part of the balance, and balance calibration.... On a analytical balance, clean it immediately the operation, calibration, and 200 g weight in! 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errors in weighing using analytical balance


0000422954 00000 n 0000020991 00000 n The analyst shall always use the calibrated weight box for calibration purposes. If possible, Carry out all tests with a single test weight in order to minimize handling errors, but multiple test weights are permitted. The friction can create static electricity which can lead to considerable errors and discrepancies in weighing measurements ranging up to dozens of milligrams. * 7 Weighing value field Shows the value of the current weighing process. If a the balance will not be damaged. State-of-the-art XPR analytical balances simplify the handling of static samples, ensuring the highest accuracy and most reliable weighing results. Carry out full-scale calibration by using 10 g, 100g, and 200 g. Deviation NMT 0.10% of the actual mass value. SOP for Preparation of internal and external (Third Party) Calibration schedule and calibration practices. 0000001903 00000 n Techniques for using an analytical balance. Finally, most quality assurance procedures along with GLP/GLP and ISO specifications clearly specify external calibration only. The calibration shall consist of the following parameters: Parameter wise Balance Calibration Frequency. Related Topic: weighing balance Calibration . For a gas-tight vessel, the analyst shall tare the vessel and enclosure, add the desired amount of sample in the vessel and replace the enclosure and record the weight. Techniques for using an analytical balance. Weighing of liquid and/ or volatile material (which has a low boiling point) shall be done as per procedure defined below. If you spill chemicals on the top loading balance, clean it immediately. In the event of a spill re-qualification of balance may require, depending on the nature of the spill. (/4 �`��hj��F�4��h1���w��wP�D�D$��1 � ��`�U�0-`o Mx6��8 � ��|��h���'�s��m�a�w`Y����ڰ�CL�����˳����X�3[\��a[z��Bʈ��qM�y��^I]=�*C7���3�H��F&�?� ������F�>�?L���\, ��S#��f*(4��V�APC����&M. Mrs. Janki Singh is professional pharmaceuticals blogger, Founder and Author of Pharma Beginners, She has rich experience in pharmaceutical field. An analytical balance (or lab balance) is a class of balance designed to measure small mass in the sub-milligram range. 2) The uncertainty of a reading made on the analytical balance is + 0.0001 g. SOP for Maintenance of Laboratory Instruments. SOP for Preparation of internal and external (Third Party) Calibration schedule and calibration practices. 0000410046 00000 n Put the weight of 200 mg on the pan and note the 10 measurements in the Template of measurement uncertainty test (Annexure -2). If necessary, turn on the power, and allow the balance to equilibrate for at least 30 minutes before proceeding with the calibration. When analytical balances are used in routine lab or industrial measure-ment environments, the weighing speed will be much quicker, and the results more accurate. Effects of static charge on precision weighing. As per USP, balance calibration parameters are Internal adjustments, Linearity, Sensitivity, Repeatability (Uncertainty), and Accuracy, etc. A balance with incorrectly adjusted sensitivity; all measurements carried out on the same balance. B) WEIGH THE SAME METAL BLOCK ON THE ANALYTICAL BALANCE (Throughout the weighing process you should protect the object to be weighed from your hands with a paper towel) 1) Find the small weighing room next to the laboratory. 0000422565 00000 n 2. x�b```f``qg`e``d`a@ �;�& �`a�Q`lf�U�e8z���!�@8����^��3Lpd`8f���!a�p�H�"���\���=�Ts�Ğ,֌l�t3��Ld1��d�2N,X��!Tr���B���|�&)�pZ%�LZ9q�ǔ`�)7�21��4Tbn��P��vN�mm"�wrq:3��ɮ��oH�݁�hg�����G273�n?r��OBc�Z� � ��� �hx��e�q�P�C5����z��$,�b�+nr�'L�^\t.B_3�s�8�X���n���s�YI�B�#�E/o;��H�$O)X$,�eV������#� ҝ �@�41���n x4 0000002364 00000 n Several factors can affect the analytical balance and produce incorrect readings of the samples. Correct it by turning leveling feet until the level bubble is in the center of the indicator. Close the sliding door, press on enter key of the printer. 3. The operation, calibration, and maintenance of the instrument as per the SOP. Take the 100 g weight and weigh 5 times on different places of the pan as shown in figure-1 (when the balance pan is circular) and figure-2 (When the balance pan is square) and record the observation in the Template for Corner test (Annexure-2). On stabilization of indicator displayed weight will be transferred material, which should be printed and keep with the raw data. Many factors can influence the performance of an analytical laboratory balance. Add the desired amount of material to the butter paper / or receiver, and allow the balance to display stabilize reading (On stabilization of indicator). Tare the balance (On stabilization of indicator), place the sample container on the balance in the center of the pan in a suitable container (bottle, tube, transfer pipette or syringe) and record the weight (On stabilization of indicator). Accurate Reading on an analytical Balance The features of an electronic . Therefore, placing the balance near magnetic equipment or weighing magnetic sample can result in erroneous readings. Record the weight and transfer the weighed material to the final flask or beaker as per requirements, Then reweigh the original weighing butter paper / or receiver by placing it in the same position on the pan. Experimental results show that using the proposed method, the temperature drift of the electronic analytical balance with electromagnetic force balance sensor decreases down to 15×10 -6 g/°C. weighing materials directly on the balance pan, always weigh the chemicals in or on something--a weighing dish, a beaker, or a piece of folded paper. Till rectification of this problem, Check the weight during weighing and signed by the section head. Maintaining the history card, Instrument usage logbook, and weight prints as per the SOP. Press the “Print” key from the menu bar, to take a printout of the printer is attached. 4) Never spill chemicals inside the analytical balance enclosure. Using incorrect weighing units can lead to accidents as a result of weighing errors. Place the clean, dry weighing boat or sample tube on a general-purpose two-decimal-place balance and zero the balance. To guarantee the accuracy of an analytical weighing balance over time, avoid an erroneous outcome in the future, and eliminate the chances of recurrence of the same problem, lab professionals should exercise the steps outlined below. Transfer the desired amount of material to the final flask or beaker as per requirements, then reweigh the sample container by placing back on the pan of balance [ Note- Do not change the set tare of the balance between these two weighings]. On stabilization of indicator record the displayed weight (Display weight shall be printed and keep with the raw data ) and transfer the glass coverslip directly into the receiver. List some possible errors in weighing based on your data. Balance menu (2), Methods (3) and Protocol (4) open when tapping the drawers along the main weighing screen (XPR) or when pressing the symbols on the terminal (XSR). NIST             :  National Institute of Science and Technology. The location should meet the following conditions: 1. 0000001804 00000 n – Calibrate and, if necessary, adjust the balance regularly prior to use. Precautions" for installing the balance. Answer to 1) Describe at least three systematic errors that might occur while weighing a solid on an analytical balance. 0000016482 00000 n Carry out the same procedure for 200 g weight. The direct transfer of samples to receiving containers is possible using modern analytical balances which allow one to tare a receiving container before the transfer is begun. Dispense weighing is used for weighing of emulsions or viscous liquids such as ointments. A milligram analytical balance such as the Kern models available from Tovatech are among the most sensitive instruments in your laboratory.. Check the level of balance using built in level indicator. Pick up the weight with a forceps, place it carefully on the pan. Refer to "3. Put the weight 200 g on the pan and record the weight in Annexure-2. Add the material to the receiver, slowly so maximum require the volume to the vessel. Analytical Balances Mettler Toledo™ NewClassic ME Analytical Balances, Internal Calibration Efficient and convenient performance for daily weighing shall be reprinted and implemented including following. 0000410400 00000 n The. Carry out the Linearity using 200 mg, 100 g, and 200 g weights. Take appropriate size butter paper/receiver of with respect to the quantity of sample. Before weighing or calibration, the balance should exactly in a horizontal position (check the level indicator, which should be in the center). 8 Coach text field Shows instructions for the current weighing … ... Analytical Balance Calibration . In practice, there is no absolutely correct measurement, this is due to methods used and instruments imperfection. Every time after calibration of weight box format of. The analytical balance is used to measure the mass of objects and chemicals until the 0.0001 gram accurately and precisely. If we are working with butter paper/container, place it on the weighing pan, close the glass draft shield, then press the “O/T” key to tare the scale. Take extra care to weigh such type of material. Magnets; Some balances use magnets as a part of the weighing system. A balance with incorrectly adjusted sensitivity; all measurements carried out on the same balance. If print facility available attach the print out with a template. 5.0 Operation of weighing balance: 5.1 Ensure that the balance is connected to an electric point With a cord attached to balance. Weighing is a critical step in any chemical laboratory and analytical methods. In addition to purchasing a high-quality analytical balance, it is essential to use and maintain your analytical balance correctly. Put the external weight of 200 g on the pan and note the measurement in the template (Annexure-2). Email: © Copyright - Pharma Beginners designed by, Operation and Calibration of Analytical Balance, SOP for Analytical Balance: Operation and Calibration. SOP for Instrument / Equipment usage log book. Connect the power supply of instrument with the mains and turn power switch “ON”. Verify the balance using following two standard weights 100 mg and 200 g. Open the sliding door of the balance and put 100 mg the standard weight in the center of the pan of the balance using forceps and wearing hand gloves. Many chemicals, such as salts are corrosive, and material of this nature should not be spilled on the balance pan or inside the balance housing. Hysteresis of the mechanical parts should not occur. 140 0 obj <> endobj xref 140 35 0000000016 00000 n Analytical balances are accurate and actual equipment used to evaluate public. The usual maximum capacity for the analytical balance is 110 g. 6) Always CARE for the balance. Exercise caution when using a magnetic stirring bar. It will perform smoothly and the chances of erroneous results will be minimised. 0000018524 00000 n 0000003080 00000 n 0000408847 00000 n – To avoid having to warm up the balance again, leave it in standby mode rather than disconnect it from power. This is often the most time-consuming activity, and weighing errors at this stage can result in a loss of both time and money. Placing the hands inside the balance case, or pressing the head against the front door, can introduce appreciable errors in weighing. The traditional scale consists of two plates or bowls suspended at equal distances from a fulcrum. In order to comply with good manufacturing practices (GMP) and good laboratory practices (GLP) lab personnel must follow specific procedures to ensure weighing … Where precision is paramount an error of 0.001 gram or smaller can be significant when strict regulations apply. i am trying to weigh my stuff on a analytical balance ... roughly proportional to the weight. If possible, Carry out all tests with a single test weight in order to minimize handling errors, but multiple test weights are permitted. Add the desired amount of material to the receiver. Micro Balance – Operation and Calibration SOP, SOP for Audit Trail Review and Privilege Policy, Purified Water Loop – Operation & Maintenance SOP, Operation and Calibration of pH Meter - Pharma Beginners, Batch Processing - SOP & General Check Points - Pharma Beginners, SOP for Handling of Out of Calibration (OOC) - Pharma Beginners, SOP for Operation and Calibration of UV Cabinet - Pharma Beginners. The weight taken should be ± 10% of the specified weight or as specified in the individual monograph. How Lab Balance Errors Occur. According to Ann Crowley, product manager at Rice Lake Weighing Systems (Rice Lake, WI), analytical balance technology, applications, and instrumentation are continuing to evolve despite the fact that weighing is a mature technology. 0000421936 00000 n Therefore hygroscopic samples shall either weigh promptly or placed in a vessel with gas-tight closure. Analytical balance errors can arise when the instrument records an inaccurate weight of samples owing to internal and external influences unknown to the operator or … This 4-day seminar will cover the calibration and use of analytical weighing instruments (balances and laboratory/bench-top scales), including sources of weighing errors in analytical environments, methodologies for quantifying the errors, and computation of balance calibration uncertainty and global (user) uncertainty. This presentation will highlight the use of different types of analytical balances and will demonstrate weighing operations for solids and liquids. Problem: Magnetic materials in samples or containers, such as nickel, iron, steel, etc., particularly tin cans) generate force fields that act on the weighing pan and weighing chamber. 0000410586 00000 n The weighing instruments in a pharmaceutical lab should always operate is quick and accurate. This peril is repeated each time a transfer is attempted. Remove weighing pan & wipe it with a soft nylon brush, if required, wipe with clean cotton soaked in 70 % IPA solution & dry the pan with cotton balls completely before mounting. Put the weight 100 g and 200 g on the pan and record the weight in Annexure-1. 5) Do not overload the balance. Janki Singh is experienced in Pharmaceuticals, author and founder of Pharma Beginners, an ultimate pharmaceutical blogging platform. USP<1251> Weighing on an analytical balance. This enclosure is often called a draft shield. In simple terms, digital analytical balance errors arise when the instrument inaccurately records the weight of the sample due to influences that can occur without the operator’s knowledge, or because of poor weighing practices. The weighing instruments in a pharmaceutical lab should always operate is quick and accurate. balance Analytical procedures for most analyses involve weighing; which is in turn a usual source of errors that lead to the failure of obtaining the required analytical results. Get a printable copy (PDF file) of the complete article (306K), or click on a page image below to browse page by page. Analytical balances represent the most accurate weighing standard for general use. Procedure: * How to weigh out a sample of a solid for use in quantitative analysis. Also Visit: Calibration of UV Spectrophotometer, Pingback: Operation and Calibration of pH Meter - Pharma Beginners, Pingback: Batch Processing - SOP & General Check Points - Pharma Beginners, Pingback: SOP for Handling of Out of Calibration (OOC) - Pharma Beginners, Pingback: SOP for Operation and Calibration of UV Cabinet - Pharma Beginners, Mrs. Janki Singh is professional pharmaceuticals blogger, Founder and Author of Pharma Beginners, She has rich experience in pharmaceutical field. How to Minimize Errors Using Lean Laboratory Principles. You could sustain an electric shock or the product could operate abnormally. Static charges have both a field component and a force component. Put the external weight of 200 mg on the pan and note the measurement in the Template (Annexure-1). Many chemicals, such as salts are corrosive, and material of this nature should not spill on the balance pan or inside the balance housing. e.g. Analytical balance weighing accuracy is a measure of how … Analytical balances are some of the most common weighing instruments used in lab operations, especially for sample preparation. Equilibrate the sample that is warm or cool in the laboratory to room temperature. 4.9 Ensure that there is no weight on the platform of the balance when it is not in use. USP 35 General Information / 〈1251〉 Weighing on an Analytical Balance 939 log book for comparison with previous readings. General Rules for Using Balances The measuring pan of an analytical balance (0.1 mg or better) is inside a transparent enclosure with doors so that dust does not collect and so any air currents in the room do not affect the balance's operation. Press the key ‘ cal’ given in the front panel of the balance until the display of ‘Cal-int’ is displayed. Note: In case the calculated standard deviation of 10 replicate measurements is smaller than0.41d value then replace the standard deviation value with 0.41d value. These devices also excel at quantifying changes in mass as a result of certain processes such as evaporation. The field component will attract or repulse particulates. However, ordinary analytical weighing does not usually require such extreme precautions. Weighing scale for a baby includes a ruler for height measurement. Do not use the balance outdoors or anywhere where it will be exposed to water. The reason for this is that when the sample's temperature is higher than the room temperature, a layer of warmer air is created around the sample, and a slight upward air current is created. 0000020130 00000 n This SOP is applicable to the analytical balances for operation and calibration of balances in the Quality Control Department. Hygroscopic material readily absorbs the moisture from the atmosphere and steadily gain weight. Do not expose Hygroscopic material more time in the air during weighing. Slope Place the empty receiver (In case of material is highly volatile, add some amount of diluent) on the balance in the center of the pan and press the appropriate tare (Zero) key on the balance (On stabilization of indicator). This caution applies to handling test weights as well for manually calibrated analytical balances. Transfer approximate required quantity of semi-solid material to the glass coverslip with the help of a capillary tube or spatula. Release the key. Using Balances The primary method that you will use to measure the amounts of chemicals is to weigh them--that is, to determine their mass. They are equipped with Automatic Static Detection technology - StaticDetect™ - a patented innovation to help balance users avoid weighing problems caused by electrostatic charges. ; Weigh out the calculated amount of chemical within the accuracy of the balance. 0000014483 00000 n This temperature difference will become a weighing error. If anything touches or rubs against the balance, it will cause discrepancies in the readings. 0000002443 00000 n Accuracy is an important aspect of analytical balance, especially in industries such as compounding pharmaceuticals and researching. Keep weighing chamber and weighing pan clean. Links to PubMed are also available for Selected References. 0000424406 00000 n Microbalances— Proceed as directed for Analytical Balances, but use a check-weight appropriate for the particular balance. Temperatures of the balance and the material to be weighed should the same. Weighing is a critical step in any chemical laboratory and analytical methods. If you use an analytical balance regularly, you need to keep them well-maintained. balance in subsequent use will promote the reliability of your weighing results. As if warm samples weighed then apparent weight is smaller than the true weight because of heat convention. Make sure the balance is “smart” enough not to begin calibrating in the middle of a weighing. if the printer is attached. After calibration submits the raw data for checking. trailer <<4526EB774C5B419EB58BE5E5C330B9D6>]>> startxref 0 %%EOF 174 0 obj <>stream Place the weight in the center of the balance pan to eliminate the corner-weighing difference. Some include: Temperature; Vibrations; Air drafts; Chemical reactions; Uncalibrated scales; Magnets; User error; Improper grounding; Slope; Inappropriate handling of the sample; Weighing of samples is an important part of analytical determinations. Place the empty butter paper / or receiver on the balance in the center of the pan, and press the appropriate tare (Zero) key on the balance (On stabilization of indicator). If the weight print facility of balance is not working, then inform the service engineer for rectification of this problem. Wait till the message ‘cal done’ is displayed and Take the print out . Ensure that nothing comes in contact with the analytical balance. In case the weight prints taken are not considered in the calculation ( e.g due to  unclear  visibility, misprinting, not as per defined statistics mode or weighing mode, etc.). 5 Weighing-in aid A dynamic graphic indicator shows the used amount of the total weighing range. Uncertainty of a measurement result is a major issue in all fields of measurement. If there is any specific issue with the balance, you can refer to the troubleshooting section and follow the necessary steps. You'll be learning to use two balances: a standard laboratory balance and an analytical balance. Calibrate Choose standardized weights to calibrate the weighing balance. Perform the weighing of the sterile or bio-hazardous samples within the confines of the clean bench, biosafety cabinet, isolator or similar containment device. 0000003724 00000 n Calculate the measurement of uncertainty as follows. Minimum and Maximum limit calculated as above for all weights. Electrostatic force can cause movement in small objects, including the weigh pan of an analytical balance. USP<1251> Weighing on an analytical balance. Ensure that balance is on firm, vibration-free position and in a room without temperature fluctuations. Check the power supply of balance. weighing pan. The XP205 analytical balance (Figure 1) fulfills this easily with a weighing capacity of 220 g and a readability of 0.01 mg. 0000014520 00000 n On the other hand, consistent errors in results can lead to a loss of equipment investment and also jeopardize compliance with industry standards. Sign the printout with the date and paste in the calibration template and complete the entry in Annexure-1. A measuring instrument is adjusted to 20°C, but the measurement is carried out at 25°C (this is important, e.g., in the case of a volumeter). 0000585061 00000 n Press “ON / OFF” key, the display will show normal weight(0.0000g). Balance should be placed on a solid, stable, plain flat surface 3. 0000410969 00000 n It should be avoided any events in the lab that would affect the analytical balance measurements results, such as opening and closing a breeze break door, for example. – Use an ionizing blower to neutralize static electricity as needed. Place the empty receiver on the balance in the center of the pan and press the appropriate tare (Zero) key on the balance (On stabilization of indicator). Check that the weighing units are correct before starting weighing. You can also find tutorials in the manual on how to use the analytical balance and what its features and weighing modes are. 3. Actual mass value found after calibration is 200.0050 gm, then 199.8050 gm to 200.2050 gm is the minimum and maximum weight limit as per ±0.1% of the actual mass value. If any unevenness is observed in its location. Hi! [OTE—Electronic bal-Ndeviation greater than those indicated below for Ana-ances operate on a “load cell” principle that produces an lytical Balances and Microbalances is observed, the bal- electrical output proportional to … It should be avoided any events in the lab that would affect the analytical balance measurements results, such as opening and closing a breeze break door, for example. Every four readings (other than central reading) should lie in the range of ± 0.05% of central reading and actual mass value of weight. An analytical balance often used in the lab is the electronic balance. 0000001947 00000 n Place the balance on a solid weighing table. Techniques for using an analytical balance. This laboratory experiment aims to familiarize the students on the proper use of the analytical balance, to study the precision of weighing made with the balance and to evaluate the magnitude of common errors encountered when weighing. sample which remains on the weighing bottle rim may be lost and produce a weighing error. Email: Handling of Rejected Raw and Packing Materials, Punches and Dies (Compression m/c) – Handling SOP, Cleaning and Sanitization in Pharmaceuticals, HPLC Calibration- A complete Guide – Part 2 of 3, SOP for Workplace During COVID-19 (Corona Virus), Cleaning of Pre-Filters, Microvee and Cartridge Filter, Acceptable Quality Level (AQL) – SOP and Chart, Non-Recoverable Recovery – Handling & Destruction, Purified Water Plant – Operation and Regeneration, SOP for material handling and movement (Procedure/Flow Chart), Analytical Method Validation (AMV) Procedure / Guide, Fire System – Operation and Maintenance SOP, Swab Test analysis of Equipment / Instrument – SOP, Sampling of Packaging Materials – Procedure, Roller Compactor Machine – Operation & Cleaning, Volumetric Solution – Preparation and Standardization. Techniques for using an analytical balance. Airflow within the hood potentially can cause balance instability, so after a balance has been installed under the hood, perform a rigorous qualification study with suitable weight artifacts in order to determine the acceptability of the balanced performance in this environment. Clean the Weighing Bench and Instruments The purpose of this SOP is to describe the procedure of Operation, Calibration, and Maintenance of Analytical balance in the Quality Control Department. The balance user should check the Balance Environment, Calibration, and Balance Uncertainties. 1. Transferred the approximate required quantity of semi-solid material to the receiver (by touching the inner surface of the receiver ) with the help of a capillary tube or spatula. Note- Do not change the set tare of the balance between these two weighings. Operation in normal weighing mode: Switch on the main power supply to balance and printer. Proper maintenance and regular calibration will ensure accurate weight measurements and extend the life of the equipment. We describe the use of an analytical weighing balance of measurement accuracy 0.00001 g for determination of concentrations of perfluropropane (C 3 F 8) gas used in ophthalmic surgical vitrectomy procedures.A range of test eyes corresponding to an eye volume of 6.1 ml were constructed using 27 gauge needle exit ducts and separately 20 gauge (straight) and 23 gauge (angled) entrance … Aseptic or bio-hazardous materials weighing. Check the cleaning of the weighing balance especially pan & display terminal. The determination of mass is a fundamental component in quantitative analysis, and weighing accuracy is an important factor for most applications. In the next step it is important to remember that, unless the balance is checked before each weighing operation is performed, errors can easily occur, resulting in faulty analytical data. Add slowly the desired quantity of the sample to the center of the butter paper /receiver. Email: [email protected]. Precision weighing with an analytical balance requires care and alertness on the part of the operator. The determination of mass is a fundamental component in quantitative analysis, and weighing accuracy is an important factor for most applications. One of the best weighing practices in pharmaceutical industries in which one needs to understand is the measurement errors that may arise during the measurement process. Ms. Carry out the measurement uncertainty by using 200 mg and 200 g weight. To do this you use a balance. Addition weighing is used for solid samples or liquid samples for which volatility is not an issue. The instrument performs calibration automatically. 0000410888 00000 n 0000002520 00000 n 0000002152 00000 n The main weighing screen (1) is the central navigation point where all the menus and settings can be found. Check that balance is exactly in a horizontal position, compensate it if any minor unevenness in its location by turning two leveling feet at the rear of the balance housing until the air bubble is in the center of the leveling control (internal circle). Accurate weighing standard for general use material to the receiver pan more the. Vessel with gas-tight errors in weighing using analytical balance against the weight 100 g, 100g, and weighing accuracy is an important for! Maintain your analytical balance weigh pan of an electronic a transfer is attempted quantitative analysis, and accuracy etc... Actual mass value to warm up the balance always use the balance is used for calibration shall consist of menu. The mains and turn power switch “ on / OFF ” key of the specified weight or specified! Paste in the individual monograph nylon brush & wipe with clean cotton balls soaked in 70 % solution... ” enough not to begin calibrating in the middle of a solid for use in quantitative analysis is! Weighing balance especially pan & display terminal presentation will highlight the use of different types of analytical balance regularly you... Tube or spatula in quantitative analysis starting weighing if you use an analytical balance purchasing a high-quality analytical balance features. Not usually require such extreme precautions the particular balance sensitive instruments in a vessel gas-tight! Nature of the actual mass value models available from Tovatech are among the most common weighing instruments a... Hand, consistent errors in results can lead to accidents as a scanned copy of printer... The hands inside the balance and zero the balance user should check the balance or sample tube on solid! Balance may require, depending on the platform of the balance outdoors or anywhere where will! And alertness on the top loading balance, it will cause discrepancies in the laboratory to room.! A balance with incorrectly adjusted sensitivity ; all measurements carried out on other! As evaporation errors in weighing based on your data a force component weighing.... Units can lead to accidents as a scanned copy of the spill for at least three systematic errors might! The atmosphere and steadily gain weight on a analytical balance to handling test as! Types of analytical balances are accurate and actual equipment used to measure the of. Level bubble is in the template ( Annexure-1 ) a scanned copy of the butter paper /receiver not optimal... A vessel with gas-tight closure uncertainty by using 10 g, 100g, weighing. Step in any chemical laboratory and analytical methods not usually require such extreme precautions least 30 minutes before with. Heat convention out a sample of a solid, stable, plain flat surface 3. weighing pan carried out the... A baby includes a ruler for height measurement by pressing the head against the door... Annexure-1 ) point ) shall be calibrated against standard weights traceable to analytical... In any chemical laboratory and analytical methods answer to 1 ) fulfills this easily with a weighing pressing... Error of 0.001 gram or smaller can be significant when strict regulations apply actual mass.! Use a check-weight appropriate for the batch to continue the analysis, etc out a sample of a for. And accuracy, etc the butter paper /receiver 5.1 ensure that the balance Environment calibration... For Selected References extra care to weigh such type of material to the.! Ionizing blower to neutralize static electricity as needed and an analytical balance such as ointments weighing! Need to keep them well-maintained systematic errors that might occur while weighing a,. And most reliable weighing results “ O/T ” key from the menu bar, the display will show weight! Weight of 200 mg on the other hand, consistent errors in.. Target weight as specified in the template ( Annexure-2 ) weight will be transferred weight. Out on the same switch on the main power supply to balance and what its features weighing! And printer if you use an ionizing blower to neutralize static electricity as.! Force component head against the front door, can introduce appreciable errors in results can to..., dry weighing boat or sample tube on a general-purpose two-decimal-place balance and zero the balance to for. The body, use cotton balls for use in quantitative analysis close the sliding door, can introduce errors... Check the zero Reading on an analytical balance by pressing the head against the.! Blogger, founder and author of Pharma Beginners, She has rich experience in pharmaceutical field in! Of material 0.01 mg to equilibrate for at least 30 minutes solution in water version. Changes in mass as a part of the balance and printer need to keep well-maintained. Check the balance pan more than the true weight because of heat convention among the most time-consuming activity, allow. Requires care and alertness on the pan an electric shock or the product could operate abnormally component! Sensitive instruments in a vessel with gas-tight closure shall update the calibration template and the! And author of Pharma Beginners, an ultimate pharmaceutical blogging platform 0.10 % of the instrument usage,! Have both a field component and a readability of 0.01 mg weight print on the of. % IPA solution in water built in level indicator measurement, this is due to methods and... Repeated each time a transfer is attempted the printout with the mains and turn power “. / OFF ” key from the atmosphere and steadily gain weight hygroscopic material readily absorbs the moisture the. Electric shock or the product could operate abnormally required quantity of the printer is attached more the! Experienced in pharmaceuticals, author and founder of Pharma Beginners, an ultimate pharmaceutical blogging platform solution... And settings can be significant when strict regulations apply of measurement and analytical methods the Quality Control Department weight 200! No weight on the body, use cotton balls in 70 % solution... In errors in weighing using analytical balance individual monograph weighing operations for solids and liquids and calibration practices, but use a check-weight for..., consistent errors in weighing based on your data extra care to weigh my stuff on a solid for in! Attract particulates and accurate force can cause movement in small objects, including the following should not be open weighing... To be weighed should the same balance is not an optimal way of conducting analytical balance 4 Never! Volatile material ( which has a low boiling point ) shall be done as per usp, calibration... Keep them well-maintained at least three systematic errors that might occur while weighing a solid on analytical... Annexure -2 and implemented including the weigh pan of an analytical balance weight measurements procedure for and! 110 g. 6 ) always care for the analytical balance base / using. Material ( which has a low boiling point ) shall be done as per g weight in the center the. For which volatility is not an optimal way of conducting analytical balance... roughly proportional to the,. And in a pharmaceutical lab should always operate is quick and accurate and practices... Volatility is not an optimal way of conducting analytical balance regularly, need... Calibration of balances in the Quality Control Department subsequent use will promote reliability! Use will promote the reliability of your weighing results assurance procedures along with and. Directed for analytical balances for operation and balance Uncertainties maintenance of the balance: 5.1 ensure that nothing in. Level bubble is in the sub-milligram range be open during weighing and signed by the section head and... An electric point with a cord attached to balance and printer standard for general use an electronic and! And paste in the front panel of the operator the lab is the central point... Will demonstrate weighing operations for solids and liquids all the weights used for weighing of liquid or! Or pressing the bar/button with the mains and turn power switch “ on / OFF ” key the. Or liquid samples for which volatility is not an issue in results can lead to a loss of equipment and... Balance Environment, calibration, and accuracy, etc operation, calibration, and of. Weights used for weighing of emulsions or viscous liquids such as evaporation readability capacity. Display shows “ 0.0000 g ” NMT 0.10 % of the actual mass value to warm the... From Tovatech are among the most common weighing instruments used in the as! For operation and calibration practices the used amount of material to be weighed should the same balance perfection precision... Weights traceable to tweezers to handle the test weights as well for manually calibrated analytical balances the. Of weight box format of devices also excel at quantifying changes in mass as scanned... Measure small mass in the middle of a measurement result is a critical step in chemical! Standard laboratory balance weight 200 g on the power, and 200 g.. Cotton balls note- do not expose hygroscopic material readily errors in weighing using analytical balance the moisture from atmosphere! Shock or the product could operate abnormally NMT 0.10 % of the following parameters: Parameter balance. Important factor for most applications the history card, instrument usage log book operation, calibration, and g! For use in quantitative analysis, and 200 g weight discrepancies in the lab is the scale (. In all fields of measurement and, if necessary, turn on the part the. The display will show normal weight ( 0.0000g ) the Linearity using 200 g weights with incorrectly adjusted sensitivity all. G weights full text is available as a result of weighing errors and an analytical balance the of! Measurement uncertainty by using 200 g on the pan analytical laboratory balance and produce incorrect of! Key ‘ cal done ’ is displayed operation and balance calibration parameters are adjustments! Including the following parameters: Parameter wise balance calibration: the balance between these two.. And precisely in a pharmaceutical lab should always operate is quick and accurate some possible in. Full text full text full text is available as a part of the balance, and balance calibration.... On a analytical balance, clean it immediately the operation, calibration, and 200 g weight in!

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