Standards and regulations, such as ISO 9001, the US GMP for Pharma, and the SQF Food Safety Code: Food Manufacturing, stipulate that measuring instruments must be periodically calibrated and verified. However, the standards make no statement on how this should be done or how often. GWP™ Verification can provide you with a recommendation on testing, based on your specific needs and internal requirements as well as those of ISO 9001 and other standards.
Mrs. G Nielsson, Quality Control Manager at a major ice cream manufacturer, commented, “The GWP Verification also contains all relevant information about test weights and SOPs. So, I am sure to do the right thing.”
Systematic balance testing minimizes risks and reduces costs. With the right SOPs, testing your balance is quick and straightforward.
Our free standard operating procedures include testing information for industry scales, laboratory microbalances, analytical balances, and precision balances for the three most important routine balance tests:
- Sensitivity
- Repeatability
- Eccentricity
What Is the Sensitivity of a Balance or Scale?
High Accuracy with a Standard Operating Procedure for Periodic Sensitivity Tests
The sensitivity test compares the weight value on your balance display with the defined/accepted value of the applied load (test weight). It reveals any serious problems with your balance or a drift in the results.
What is the general rule for testing the sensitivity of a balance or scale? How should you prepare for a sensitivity test? What can affect the performance of a weighing device, and how can you reduce human error in testing?
Sensitivity and precision of a balance or scale go together—find out how to carry out sensitivity testing to get trustworthy results. Get correct results with the METTLER TOLEDO Standard Operating Procedure for routine sensitivity testing.
What Is the Correct Way to Check the Repeatability of Balances and Scales?
Consistent Outcome Every Time with a Standard Operating Procedure for Periodic Repeatability Tests
Your balance or scale must provide the same result for repeated weighings of the same load under the same measurement conditions. Repeatability tests are carried out less frequently than sensitivity tests. However, they are important when weighing small loads due to the fact that in low weighing ranges, repeatability is the largest contributor to measurement uncertainty.
Discover how to achieve accurate results every time with the METTLER TOLEDO Standard Operating Procedure for routine repeatability testing.
What Measures Reduce Uncertainty in Weighing Due to Eccentricity?
Accurate Results with a Standard Operating Procedure for Periodic Eccentricity Tests
Eccentricity testing assesses the deviation of the weighing value through off-center (eccentric) loading. The purpose of the eccentricity test is to ensure that every eccentric load deviation (corner-load deviation) is within weighing tolerances.
Eccentricity errors can be minimized by handling the load correctly, i.e., placing it in the middle of the weighing pan. This SOP explains how to carry out eccentricity tests and how to handle your test weights.
Ensure you get correct results with the METTLER TOLEDO Standard Operating Procedure for routine eccentricity testing.
