Key Instruments - Gas Conversion Factors

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%

	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