1) Military: CAM, agent detector unit, chemical agent detection sensor, chemical agent monitor, gas identifier, toxic vapor detector
2) Engineering: gas indicator
3) Mining: gas monitor
4) Oil: gas alarm
5) Chemical weapons: gas indicator / gas alarm, gas/agent alarm
6) Security: chemical agent detector, chemical sensor, gas alarm device, gas detector
7) oil&gas: multi-toxic gas monitor, toxic gas monitor
Универсальный русско-английский словарь. Академик.ру. 2011.