68 Field Instrumentation GEN Rev) Ta = actual temperature (absolute. We can combine these three equations into a single equation for gas-to-gas conversions. This equation enables us to convert any reading from a flow meter into the correct reading for the specific gas and the specific conditions under which it is measured.
The master equation is Qa = Qi √ (Drc)(Pa)(Tc) / (Dra)(Pc)(Ta) It is assumed that the gas being measured is an ideal or perfect gas. A perfect gas is one in which the molecules are infinitely small and exert no forces of attraction or repulsion on each other. Areal that is non-perfect gas has molecules of a finite size that exert forces on each other. To adjust these equations for non perfect gas effects, apply a compressibility factor. The compressibility factor fora perfect gas is 1.00.
Fora non perfect gas, the correction factor might be 0.85.
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