Key Instruments: Flowmeter Manufacturing Technical Support

Gas Conversion Factors

To determine corrected flowrate: find the gas for which the meter is calibrated in the left column, move to the right to the gas
that is being used. Multiply the flowrate indicated on the meter by the correction factor. This will equal an approximation of the
flowrate of the gas being used.

Please note: this correction factor is only accurate within ±10%. This is also inaccurate for extremely low flow, or elevated pressure; consult factory for your specific condition.

	Gas being used / S.G.
Gas for which meter is calibrated?	H2	He	Cracked Ammonia	Methane	Ammonia	City Gas	Neon	Acetylene	N2 or CO	Air	Ethane	O2	Argon	CO2 or N2O	Propane	Butane
Gas for which meter is calibrated?	0.070	0.138	0.294	0.554	0.588	0.620	0.700	0.899	0.967	1.000	1.038	1.105	1.379	1.520	1.523	2.007
AIR	3.78	2.69	1.84	1.34	1.30	1.27	1.20	1.05	1.02	1	0.98	0.95	0.85	0.81	0.81	0.71
OXYGEN	3.97	2.83	1.94	1.41	1.37	1.34	1.26	1.11	1.07	1.05	1.03	1	0.90	0.85	0.85	0.74

Calculating Conversion Factors

Based on Specific Gravity

Calculating Conversion Factors Based on Specific Gravity

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