Calibration gas comes in a variety of mixes and is used to calibrate instruments like gas analyzers, multi-gas monitors or gas detectors. Gases come in different types, including hydrogen sulfide, carbon monoxide, pure methane and many more. Each type of calibration gas is used for specific applications.
The gas mixture in calibration gas cylinders is certified to be prepared gravimetrically, using NIST traceable weights. The lot number and nominal value of the gas constituents in volume, percent by mass, PPM, or volume is specified on the cylinder.