... ISO9001:2000 certificate Gas detector KB-501SG used advanced infrared sensor, which can detect the concentration of Methane (CH4 ... gas stations, paint spray booths, etc. Features• Advanced NDIR infrared sensor;• High stability, long calibrating period, minimal maintenance time;• ... proof Index Ex d II CT6Performance Life >5 yearsOther Infrared controlled, can be used for reading and calibrating data at ...