TRACEABILITY AND UNCERTAINTY ANALYSIS FOR A CALIBRATION PROCESS FOR FLOWMETERS, USING CORIOLIS FLOWMETERS AS REFERENCE
Robert DeBoom, Marc Buttler, Andrew Kolbeck, Aart Pruysen
Abstract:
A flow meter manufacturer has recently developed a new system for calibrating its flow instruments. This system is based on the use of Coriolis flow meters as intermediate transfer standards. This new system is referred to as the Transfer Standard Method or TSM.
This paper and presentation will review the test data used to establish the validity of the Coriolis-based TSM, and will describe the process layout and design of the new TSM flow calibration stands. The focus of the paper, however, will be on traceability of the calibrations to national standards and on the uncertainty analysis for the TSM flow stands.
The working mass standards in the MMI (Micro Motion, Inc.) Primary Stand laboratory are traceable to Japanese and United States of America national standards. These working mass standards are used to calibrate and verify the scales of the MMI Primary Stand. The MMI Primary Stand is used to calibrate the reference meters. The reference meters are placed into service in TSM stands.
The uncertainty analysis can be split into four main parts:
A. Uncertainty of the scales in the MMI Primary Stand
B. Uncertainty of the MMI Primary Stand (Best Measurement Capability of the
MMI Primary Stand)
C. Uncertainty of the reference meters, calibrated on the primary stand
D. Uncertainty of the TSM stand (Best Measurement Capability of TSM stand).
This paper and presentation explain, step by step, the uncertainty calculations from scale to flowmeter under test. The end result of this analysis, for worst case conditions, is a Best Measurement Capability of the TSM system of 0.013% on mass and 0.020% on volume.
Keywords:
Coriolis, traceability, uncertainty, transfer standard, flow meter, best measurement capability
Download:
IMEKO-TC9-2000-003.pdf
DOI:
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Event details
IMEKO TC:
TC9
Event name:
FLOMEKO 2000
Title:
10th Conference on Flow Measurement
Place:
Salvador, Bahia, BRAZIL
Time:
04 June 2000 - 08 June 2000
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