The orifice meter is a time tested and proven device used for the measurement of gases and fluids, with standards covering every aspect of the meter run. Uncertainty's can me calculated without the needs for flow calibrations. Those uncertainties can be further reduced through flow calibration. The standards have been written and modified over time and continue to evolve. So that repeatable accurate measurement may be achieved. While the orifice meter has the ability to measure either gas or liquid, measurement should be clean single phase for greater accuracy.
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