TGS2600/2602/2603 Air Contaminants Sensors Compact PCB mounting gas sensors from Figaro for use in the detection of gaseous air contaminants. Three types are available: TGS2600 has high sensitivity to gases such as hydrogen, ethanol and carbon monoxide; TGS2602 has high sensitivity to VOCs and odorous gases such as ammonia and hydrogen sulphide; TGS2603 has high sensitivity to food odours, and to amine-series and sulphurous odour gases. All of the sensors feature low power consumption, long operating life and utilize simple electrical circuitry.