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Assignment of values for a set of in-house developed verification masses using an inter laboratory comparison approach

Published online by Cambridge University Press:  29 June 2011

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Abstract

Traceable measurements are a mandate for the reliability of test results. Although periodic calibration activities ensure traceability, in between verifications are essential to maintain the consistency of results. In analytical laboratories, electronic balances are widely used for quantity estimations. Owing to the inherent instability problems associated with semiconductor strain gauges and performance degradation on aging, they need to be regularly controlled using verification mass. But traceable and calibrated masses are expensive for routine use in laboratories. A mass set is designed, prepared in-house and mass values with uncertainty are assigned to undergo such verification. Steps employed to assign the mass values based on the principle of inter laboratory comparison (ILC) are reported. Reference value and corresponding uncertainty estimations are determined by performing an ILC in five different laboratories. The measurement results with uncertainty from each laboratory were received for individual masses. These results were analyzed for consistency and the values along with the weighted uncertainties were assigned.

Type
Research Article
Copyright
© EDP Sciences 2011

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References

National Association of Testing Authorities (NATA), NATA Technical Note 13: User checks and maintenance of laboratory Balances (NATA, Australia, 2007)
Xiaohua, Lu, Hongmei, Li, Fanmin, ,Jie, Ji, The establishment of a quality evaluation system of reference materials, Accred. Qual. Assur. 14, 329 (2009) Google Scholar
C.M. Sutton, Assuring the Quality of Weighing results, Measurement Standards Laboratory (MSL) Technical Guide 12 (MSL, New Zealand, 2006)
Gonzalez, A.G., Heerrador, M.A., The assessment of electronic balances for accuracy of mass measurements in the analytical laboratory, Accred. Qual. Assur. 12, 21 (2007) CrossRefGoogle Scholar
Committee on reference materials (REMCO), International Organization for standardization (ISO) Guide 34, General requirements for the competence of reference material producers (ISO, Switzerland, 2009)
International Organization of Legal Metrology (OIML) technical committee TC 9/SC 3 Weights, International Recommendation-OIML R 111-1: Weights of classes E1, E2, F1, F2, M1, M1–2, M2, M2–3 and M3 Part 1: Metrological and technical requirements (OIML, Paris, 2004)
D. Benjamin, Metals Handbook: Properties and Selection: Steels, Tool materials and special purpose metals (American Society for Metals (ASM) International, USA, 1980), Vol. 3, pp. 5–34
Committee on reference materials (REMCO), ISO Guide 35, Reference materials, General and statistical principles for certification (ISO, Switzerland, 2006)
Pommé, S., Spasova, Y., A practical procedure for assigning a reference value and uncertainty in the frame of an Interlaboratory comparison, Accred. Qual. Assur. 13, 83 (2008)CrossRefGoogle Scholar