How Pressure & Temperature Changes Affects Flow Meter Accuracy in Gas Flow Measurements

By Anonymous -
In gas flow measurement, the density of the gas changes as pressure and temperature change. This change in density can affect the accuracy of the measured flow rate if it is uncompensated. There are two exceptions however where uncompensated density change will not affect the flow measurement:
(1) A direct mass flow measurement made with a mass meter – coriolis or thermal mass.
(2) An actual volumetric flow measurement made by velocity type meters – Vortex, Turbine, Ultrasonic, Positive Displacement etc.

The accuracy of all other types of flow measurements are affected by changes in gas density.

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