Crowcon Xgard Bright Fixed Gas Detector


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The Crowcon Xgard Bright is a fixed detector for flammable and toxic gas detection and oxygen monitoring. The Crowcon Xgard Bright is designed to provide ease of operation and reduced installation costs. The Xgard Bright provides analogue 4-20mA and RS-485 Modbus signals as standard, comes with an Alarm and Fault relay as standard as well as optional HART communications.

Using the Crowcon Xgard Bright lowers the cost of installation, and the 4-wire addressable implementation drastically reduces the cabling requirements. The large OLED display allows users to easily work with Xgard Bright during install, calibration and routine maintenance without the need to open the housing.

The Crowncon Xgard Bright is available with MPS (Molecular Property Spectomete) technology, and is suited for a wide range of gases and sensor types.

Range of flammable gasesMPS0-100% LEL
Hydrogen sulphide (H2S)Electrochemical10, 20, 25, 50, 100, 200 ppm
Oxygen (O2)Oxygen0-25% vol
Carbon Monoxide (CO)Electrochemica0-25, 50, 100, 200, 250, 300, 1000, 2000 ppm
Methane (CH4)Pellistor0-100% LEL
Pentane (C5H12)Pellistor0-100% LEL
Hydrogen (H2)Pellistor0-100% LEL
LPGPellistor0-100% LEL
Carbon Dioxide (CO2)Infra-Red0-5% vol
Methane (CH4)Infra-Red0-100% LEL
Propane (C3H8)Infra-Red0-100% LEL
Ammonia (NH3)*Electrochemical0-50, 100 ppm
Chlorine (CL2)*Electrochemical0-5, 10 ppm
Ozone (O3)*Electrochemical0-1 ppm
Sulpur dioxide (SO2)*Electrochemical0-10 ppm
Butane (C4H10)Infra-Red0-100% LEL
Pentane (C5H12)Infra-Red0-100% LEL
LPGInfra-Red0-100% LEL
Hydrogen Cyanide (HCN)*Electrochemical0-25 ppm
Hydrogen Peroxide (H2O2)*Electrochemical0-5 ppm

* Safe Area Only

Additional information


ADC 12 aluminum alloy


156 x 166 x 109mm (6.1 x 6.5 x 4.3inch)


Aluminum alloy 1kg (2.2lbs)

IP Rating

IP65, IP66 (with weatherproof cap)

Cable Entry

2x M20 (stopping plug fitted to left-side entry) or supplied with ½” NPT adapters


10-30Vdc. 3W max

Electrical Output

4-20mA current sink or source, HART (optional), RS-485 Modbus RTU


Alarm 1, Alarm 2, Fault SPST contacts rated 1A 30Vdc

Sounder out

24Vdc (nominally), 250mA maximum load

Temperature Range

-40°C to +70°C

Relative Humidity

0 to 95% RH, non-condensing


+/- 2% FSD

Zero drift

+/- 2% FSD per year maximum


ATEX/IECEx, Ex II 2D Ex tb IIIC T80°C Db, Ex II 2G Ex db IIC T6 Gb


EN60079-0:2012 + A11:2013, EN60079-1:2014, EN60079-31:2014, IEC60079-0:2017 Edition 7, IEC60079-1:2014-06, IEC60079-31:2013


Certified for use in Zone 1 and Zone 2 areas

EMC compliance



Electrochemical, Infrared, Oxygen, Pellistor



Gas Type

Carbon Monoxide 0-1000ppm, Carbon Monoxide 0-100ppm, Carbon Monoxide 0-2000ppm, Carbon Monoxide 0-250ppm, Carbon Monoxide 0-500ppm, Carbon Monoxide 0-50ppm, Hydrogen 0-100%LEL, Hydrogen sulphide (H2S) 0-100ppm, Hydrogen sulphide (H2S) 0-25ppm, Hydrogen sulphide (H2S) 0-50ppm, Hydrogen Sulphide 0-200ppm, Infrared Carbon Dioxide 0-5% VOL, Infrared LPG 0-100% LEL, Infrared Methane 0-100% LEL, Infrared Propane 0-100% LEL, LPG 0-100% LEL, Methane 0-100% LEL, Oxygen 0-25% VOL


HART disabled, HART enabled