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Workshop on calibration of non-automatic weighing devices

This workshop is intended for the participants from calibration laboratories from GULFMET NMIs, accredited laboratories, and laboratories in the process of accreditation, as well as peer reviewers’ witnesses to measurements, etc. The workshop will explain a consistent approach to good measurement practice leading to and supporting laboratory accreditation.

Workshop on calibration of non-automatic weighing devices

The workshop on calibration of non-automatic weighing devices will provide knowledge and skills related to:

  1. Essential knowledge regarding the metrological quality of non-automatic weighing instruments (NAWI) confirmed by calibration based on EURAMET Calibration Guide No. 18

  2. An introduction to the methodology of measurement uncertainty estimation for NAWI result

  3. An introduction to the requirements of ISO/IEC 17025 for calibration results for NAWI that can be recognized and accepted.

  4. Some elementary examples for calibration of NAWI will be considered

Course Outlines:

First day:

  • Measurement traceability in mass metrology

  • Harmonized approach of confirmation of NAWI metrological quality

  • Difference between calibration/verification

  • General aspects of the calibration

  • Measurement methods (drift due to changes in temperature, air density and other influence factors)

  • Measurement result in calibration

  • Estimation of measurement uncertainty at the calibration

  • Estimation of air density

  • Coverage factor k for expanded uncertainty of measurement

  • Minimum weight and safe weighing range

Second day:

  • Reporting calibration results - Calibration certificate of NAWI according to ISO/IEC 17025

  • Uncertainty budget for calibration of NAWI

  • Expression of CMC for NAWI

  • Ensuring the validity of result by participating in interlaboratory comparisons

  • Protocol for measurements for calibration

  • Examples of calibration of NAWI (practical measurements and calculations)


  • Metrology professionals: This includes staff from National Metrology Institutes (NMIs), accredited calibration laboratories, and manufacturers of NAWI calibration equipment. They would gain in-depth knowledge of calibration procedures, best practices, and regulatory requirements.

  • NAWI users: This encompasses individuals and businesses that rely on NAWI in their daily operations, such as:

    • Manufacturers: Production lines, quality control departments, etc.

    • Healthcare facilities: Laboratories, pharmacies, etc.

    • Scientific research laboratories: Weighing sensitive materials and experiments.

    • Government agencies: Performing inspections and enforcement of NAWI regulations.

    • NAWI technicians and repair personnel: They would learn about proper maintenance and repair procedures to ensure accurate and reliable measurements.

Non-automatic weighing instruments (NAWI) are widely used to determine the value of a load in terms of mass. A regular assessment is fundamental to ensure that a balance provides reliable and accurate weighing results. Calibration is the main means to establish the relation between the balance indications and the reference standards, which will be applied in the use of the balance in order to obtain a traceable result. EURAMET Calibration Guide No. 18 ‘Guidelines on the Calibration of Non-Automatic Weighing Instruments’ is the document used in Europe and worldwide as a reference for the calibration of non-automatic weighing instruments. The purpose of the guide is to enhance the equivalence and mutual recognition of calibration results obtained by laboratories performing calibrations of non-automatic weighing instruments.

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