You can divide calibration gases into two categories; zero calibration and span calibration. Zero calibration gas is a gas which is free of flammable gases. Zero calibration gases are performed when gas detection or gas analysers get calibrated with none of the analyte gas structures to which the analyser or detector will respond. For example, you perform a zero calibration of an oxygen-, or carbon dioxide analyser with pure nitrogen. Because nitrogen does not hold either oxygen or carbon dioxide, a zero point can be confirmed this way.
A span calibration is a more advanced type of calibration gas by which there is a precisely composed concentration of detectable gas exposed towards the gas detector or gas analyser. SEMA Gases delivers multiple types of calibration gases suitable for the shipping industry, offshore industry, chemical industry, laboratories, and universities.
|Methane (CH4), Propane (C3H8),
Butane (C4H10). (LEL or Volume mixtures)
|CO, H2S, CI2, SO2, NH3, CO2 & much more
|% Volume mixtures for oxygen meter and IGS
|LEL, H2S, CO, O2
2, 3, 4 or 5 gas mixtures available