Multi-gas detector is a equipment that detects from 2 to 7 gases depending on the configuration. TES Industry categorises into several groups as follows:
2-gas detectors: Limited by application and market demand, so few manufacturers of this type. The example model is MSA Altair 2X, which can measure CO/H2S or CO/NO2 or O2/H2S. 4-gas detector: This is the most common line, usually measuring 4 gases: Explosive (LEL or Ex)/O2/CO/H2S, common application for confined space.
5-gas detector: Although measuring 5 gases, it is limited in configuration. The detector has 4 sensors mounting positions. Of which 3 are equipped with LEL sensors; IR (or PID); O2 is unchangeable, only 1 position is installed with a toxic gas sensor. The typical model is GasAlertMicro 5.
6-7 gas detector: These are high-end, highly customizable detector. Interchangeable sensor mounting positions. The sensor just needs to be plugged in to run (Plug and Play).
When it comes to multi-gas detector, customers often talk about measuring 4~6 gases as above.