We match each test meter to the calibration facility that is best suited to provide optimum accuracy. Eight of our test loops use the gravimetric method (primary standard) to measure flow. Our largest test line uses a master Venturi to measure flow (a secondary standard). Our test methods meet ASME/ANSI MFC-9M-1988 "Measurement of Liquid Flow in Closed Conduits by Weighing Method" and ISO 4185-1980 "Measurement of Liquid Flow in Closed Conduits - Weighing Method."
Standard calibration includes 12 test points covering a range of Reynolds numbers— from the maximum attainable to about 10% of the maximum. Clients may supply external specifications to supplement our standard test program, including additional test points or modification to the test range for their specific applications. Additionally, our engineers are adept at reproducing upstream piping geometry, including elbows, tees, or flow straighteners, that are used to evaluate the influence of specific upstream piping on flow meter performance.
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 0.25% is used as a conservative guideline. When specific meters are calibrated, the test data may be used to estimate the actual uncertainty.