Crowcon TXgard-IS+ Fixed Gas Detector


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The Crowcon TXgard-IS+ is an Intrinsically Safe (I.S.) Toxic and Oxygen gas detector, with a local LCD display. A wide range of sensors are available for use in a variety of applications.  The TXgard-IS+ is ATEX certified for use in Zone 0,1 or 2 hazardous areas and also UL and cUL certified for use in Division 1 or 2 hazardous areas.

Gas LTEL (ppm) STEL (ppm) Range available
Ammonia (NH3) 25 35 50, 100, 1000ppm
Carbon monoxide (CO) 20 100 250, 500ppm
Chlorine (Cl2) 0.5 5, 10, 20ppm
Chlorine dioxide (CLO2) 0.1 0.3 1 ppm
Hydrogen (H2) 2000ppm, 50% LEL, 100% LEL
Hydrogen cyanide (HCN) 0.9 4.5(MEL) 25ppm
Hydrogen fluoride (HF) 1.8 3 10ppm
Hydrogen sulphide (H2S) 5 10 25, 50, 100, 200ppm
Nitrogen dioxide (NO2) 0.5 1 10ppm
Oxygen (O2) 19.5% Vol. typical alarm 23.5% typical alarm 25% Vol.
Ozone (O3) 0.2 1ppm
Phosgene (COCl2) 0.02 0.06 1ppm
Phosphine (PH3) 0.1 0.2 2ppm
Sulphur dioxide (SO2) 0.5 1 10, 20, 30ppm

Additional information


160 x 123 x 92mm (6.3 x 4.8 x 4.5ins)


0.7kg (1.5lbs)

IP Rating



Junction box: Carbon loaded nylon, Sensor housing: ABD Plastic


8-32Vdc, 4-20mA loop-powered

Cable Entry

1 x M20 or 1/2” NPT with adaptor

Temperature Range

-20°C to +55°C (-4°F to 132°F

Relative Humidity

15 to 90% RH non-condensing


2-Line, 16 character LCD

Calibration method

Via push-buttons

Electrical Output

2 wire 4-20mA sink


Suitable for up to 2.5mm2 cable

Sensor Type



+/- 2% FSD typically

Zero drift

+/- 2% FSD, 6 months typically


Tested in accordance with EN60079-29-1


Zone 0, 1 or 2, Division 1 or 2 (when connected via an isolation device)


Ex II 1 G Ex ia IIC T4 (-40°C to +65°C), Exia IIC T4 Gb Tamb -20°C to +55°C, UL Class I, groups A, B, C and D

EMC compliance

EN 50270, FCC: CFR 47 Part 15, ICES-003

Display Type

Fixed display



Gas Type

ammonia, 0-100 ppm (-20°C min), ammonia, 0-50ppm (-20°C min), Carbon Monoxide 0-250ppm, carbon monoxide, 0-500 ppm, chlorine, 0-10ppm, chlorine, 0-20ppm, Hydrogen Sulphide 0-200ppm, hydrogen sulphide, 0-100ppm, hydrogen sulphide, 0-25ppm, hydrogen sulphide, 0-50ppm, hydrogen, 0-100% LEL, Oxygen 0-25% VOL, sulphur dioxide, 0-10ppm, sulphur dioxide, 0-20ppm