METROLOGICAL TRACEABILITY

 METROLOGICAL TRACEABILITY

ISO/IEC 17025:2017 Clause 6.5 METROLOGICAL TRACEABILITY

In the world of testing and calibration, confidence in results is non-negotiable. That’s why

Clause 6.5: Measurement Traceability is a cornerstone of ISO/IEC 17025:2017.

What is Metrological Traceability?

It’s the ability to relate individual measurements to established references (usually SI units)

through an unbroken chain of documented calibrations—all with stated uncertainties.

Metrological traceability refers to the process by which measurements are linked to

national or international standards through an unbroken chain of comparisons or

calibrations. In reference to the requirement all calibrations must be traceable to SI Units.

And SI Units are maintained by BIPM, which is situated in Paris, France. The purpose of

having traceable to same units of measurement is to have harmonization of measurement

across the globe there by relating Calibration or measurement in one country accepted in

other country. This ensures that measurements are consistent, accurate, and comparable

across different contexts and locations. The chain of comparisons typically involves

calibrations and verifications at various levels, each providing a documented link to a

recognized reference standard. Also, part made in one country can only be fit in assembly

in other country maintaining same metrological traceability.

Key Takeaways from Clause 6.5:

 Calibration must be performed by accredited labs (or labs meeting ISO/IEC 17025

standards).

 Reference standards and equipment used must have documented traceability to SI

units or internationally recognized references.

 For non-calibration labs, verified and validated procedures are essential to ensure

reliable results.

Metrological traceability is important for several reasons:

1. Accuracy and Consistency: It ensures that measurements are accurate and

consistent across different instruments, laboratories, and locations. This is

essential for reliable data and results, especially in scientific research and industry.

2. Standardization: By linking measurements to recognized national or international

standards, it helps maintain uniformity and standardization across various sectors

and applications.

3. Quality Assurance: In industries such as pharmaceuticals, manufacturing, and

environmental monitoring, metrological traceability is critical for quality control

and assurance. It helps in meeting regulatory requirements and maintaining

product quality.

4. Comparability: It allows for the comparison of measurements taken at different

times or places, which is crucial for longitudinal studies, cross-sectional

comparisons, and global data integration.

5. Reproducibility: Ensuring traceability supports the reproducibility of experiments

and processes, which is a cornerstone of scientific research and technological

development.

Overall, metrological traceability underpins the reliability and credibility of

measurements, which is fundamental for both everyday applications and

advanced scientific and industrial processes.

Why it Matters:

Traceability builds confidence, ensures comparability, and strengthens trust with

customers and regulators. It’s the foundation for reliable, repeatable, and recognized resue