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White paper- Calibrating Weighing Instruments - Part 2

White paper- Calibrating Weighing Instruments - Part 2

Product catalog summary

Introduction
Weighing instruments are crucial in various sectors, including commerce and industry. Despite their accuracy, it is essential to understand their potential inaccuracies. Calibration is a key process to ensure the reliability of these instruments.

Calibration Procedures
Calibration involves several procedures based on guidelines like the EA-10/18. Typical tests include:

Repeatability Test: Measures the consistency of the scale by weighing an object multiple times.
Eccentricity Test: Assesses the impact of the object's position on the load receptor.
Weighing Test: Evaluates errors in scale indication for predefined loads.

In the pharmaceutical industry, additional tests for minimum weighing capability are conducted.

Uncertainty in Calibration
Calibration not only identifies errors but also quantifies the uncertainty of these errors. Factors contributing to uncertainty include weight mass accuracy, air convection, and digital scale resolution. Standard uncertainty is expressed with a coverage probability of 68.27%, while expanded uncertainty is typically extended to 95.45% using a coverage factor of k=2.

Uncertainty of Weighing Results
Post-calibration, the uncertainty of routine weighing results is generally higher due to factors like random loads and environmental changes. Calculating this uncertainty helps determine the instrument's accuracy and calibration frequency.

Example
An example illustrates that at a calibration point of 10 kg, the error might be E = 2.5 g with an uncertainty u(E) = ±0.7 g, indicating a 68.27% probability that the error is between 1.8 g and 3.2 g.

CMX Calibration Software
CMX software facilitates the calibration and testing of weighing instruments, allowing for unique configurations and easy replication across scales. It supports setting error limits and calculating both standard and expanded uncertainties, ensuring compliance with calibration certificate requirements.

Catalog excerpts

White paper- Calibrating Weighing Instruments - Part 2-1

table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:17.00pt "Microsoft Sans Serif", sans-serif; } .font1 { font:6.00pt "Tahoma", sans-serif; } .font2 { font:7.00pt "Tahoma", sans-serif; } .font3 { font:25.00pt "Tahoma", sans-serif; } .font4 { font:29.00pt "Tahoma", sans-serif; } .font5 { font:35.00pt "Tahoma", sans-serif; } Beamex Calibration White Pape [email protected] weighing instruments: Part 2 beamex World-class calibration solutions

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White paper- Calibrating Weighing Instruments - Part 2-2

EN_FICHE DIVA LClean-21x29,7 table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:8.00pt "Arial", sans-serif; } .font1 { font:9.00pt "Arial", sans-serif; } .font2 { font:11.00pt "Arial", sans-serif; } .font3 { font:13.00pt "Arial", sans-serif; } .font4 { font:35.00pt "Arial", sans-serif; } .font5 { font:9.00pt "Times New Roman", serif; } .font6 { font:45.00pt "Times New Roman", serif; } BEAMEX Calibration White Paper Calibrating weighing instruments: Part 2 Any scale is capable of producing incorrect results. W eighing is a common form of measurement in commerce, industries...

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White paper- Calibrating Weighing Instruments - Part 2-3

EN_FICHE DIVA LClean-21x29,7 table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:7.00pt "Arial", sans-serif; } .font1 { font:8.00pt "Arial", sans-serif; } .font2 { font:8.10pt "Arial", sans-serif; } .font3 { font:9.00pt "Arial", sans-serif; } .font4 { font:11.00pt "Arial", sans-serif; } .font5 { font:13.00pt "Arial", sans-serif; } .font6 { font:8.00pt "Georgia", serif; } .font7 { font:9.00pt "Times New Roman", serif; } BEAMEX Calibration White Paper The weights are not in the exact middle of the load receptor. The values of uncertainty determined at each point of calibration...

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White paper- Calibrating Weighing Instruments - Part 2-4

EN_FICHE DIVA LClean-21x29,7 table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:8.00pt "Arial", sans-serif; } .font1 { font:9.00pt "Arial", sans-serif; } .font2 { font:11.00pt "Arial", sans-serif; } .font3 { font:13.00pt "Arial", sans-serif; } .font4 { font:9.00pt "Times New Roman", serif; } BEAMEX Calibration White Paper Calibrating and testing weighing instruments using CMX CMX's scale calibration enables you to uniquely configure calibration and test each weighing instrument. Correspondingly, copying configurations from one scale to another is easy. Error limits...

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