Convert nitrogen-equivalent flow to process-gas flow, or reverse it, using selected MKS 1479A gas correction factors.
Gas Correction Factor Formula
For an uncorrected nitrogen-calibrated indication, process-gas standard flow = indicated flow × GCF. Reverse the calculation by dividing the desired process-gas flow by GCF. Nitrogen has factor 1.00. The eight selectable reference factors are air 1.00, nitrogen 1.00, argon 1.39, helium 1.39, carbon dioxide 0.70, methane 0.72, oxygen 1.00 and neon 1.46.
Example and Scope
A nitrogen-equivalent indication of 100 sccm corresponds to an estimated 139 sccm of argon using factor 1.39. Conversely, 250 sccm of argon corresponds to approximately 179.8561 sccm nitrogen-equivalent. Both flows use the same standard conditions: 0 °C and 760 mmHg absolute.
These selected factors come from the MKS Type 1479A manual, revision B (10/97), Appendix B and page 52. They are reference estimates tied to this model and calibration basis. Check the actual instrument calibration and current manufacturer guidance. Do not apply a factor twice when the instrument already reports the selected gas. This calculator does not convert detector/LEL readings, model gas mixtures, or choose flow-controller hardware.
For ideal-gas temperature and pressure volume conversion or general reference/observed ratios, use the Correction Factor Calculator.