A calibration gas is a reference gas or gas mixture used as comparative standard in the calibration of analytical instruments, like gas analysers or gas detectors. Therefore, a calibration gas has to be of a precisely defined nature or composition, like zero gas or span gas, for example 500 ppm carbon monoxide in nitrogen.
To be a calibration gas, the gas must be traceable to a national or international standard. Traceability is the unbroken chain of comparisons to an acceptable international standard.
Industries supported include Laboratory and analytical, Safety and gas detection, environmental monitoring, Marine, Breath test analysis, oil and gas, chemical, mud logging and universities.