Flow measurement uncertainty is estimated using ASME PTC 19.1, and values are dependent on the test line. A generic statement of an uncertainty of 0.2% is used as a conservative guideline. When specific meters are calibrated, the test data may be used to estimate the actual uncertainty. Best uncertainties are listed below for each weigh tank and the secondary standard.
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Facility |
Best Uncertainty |
 | |
 |
Allen 100,000# scale Allen 10,000# scale Allen 1,000# scale
Hooper 50,000# scale Hooper 10,000# scale Hooper 1,000# scale Hooper Secondary Standard |
0.12% 0.06% 0.05%
0.13% 0.18% 0.05%
0.50% |
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