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Currently, I am trying to find rotameter calibrated for R134A gas flow. However, most companies only sell rotameter or variable area flowmeter for water/Air/Nitrogen flow. Is it possible to use any air rotameter for R134A and convert the scale reading to corresponding refrigerant flow through the use of rotameter conversion equation(shown below) ? Will the converted mass flow rate be accurate?

Qs = Qi * sqrt((TsPa)/(TaPs)) Where Qs = true SCFM Qi = indicated flowrate ('SCFM') Ts = calibration temp (R) Ta = actual temp (R) Pa = actual pressure (psia) Ps = calibration pressure (psia) Thank you!

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