Crowcon Xgard Type 4 Fixed Gas Detector

Code: XG4
  • Catalytic bead sensor for flammable gas
  • Suitable for high-temperature applications
  • Zones 1 or 2, Div 1 or 2

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The Crowcon Xgard Type 4 is an Exd Flameproof flammable gas detector using a poison-resistant pellistor within a 316 stainless steel housing attached to an Xgard enclosure (aluminium) also contains the terminals to provide a three-wire mV Wheatstone Bridge output. Can be connected directly to Crowcon Gasmaster and Gasmonitor; an Accessory Enclosure accessory is required for connection to 4-20mA type control systems such as Vortex.

Suitable for use with a range of cable glands; M20 or 1/2″ NPT or 3/4″ NPT. Units can be installed on walls or ceilings, with three junction box choices—replacement sensors plugin. Accessories are available for duct mounting, sampling applications and remote gassing – simple sensor checking. Splash guards and weatherproof caps are available for wash-down areas or marine applications.


  • Simple installation and maintenance, common spares for all Xgard types, minimise inventory
  • Validated to IEC 61508 (SIL 1 to SIL 3)Crowcon Xgard
  • Ingress protection IP54
  • Operating temperature -20 to +150°C
  • Response time T90 <15s (typical)
  • Approvals ATEX: II 2 GDExd IIC T3 Gb (Tamb -40 to +150°C)
  • Size 195 x 166 x 111 mm (7.6 x 6.5 x 4.3 inches)
  • Weight Aluminium 1.5kg (3.3 lbs)


C01339 Flow adaptor, for use in sampling applications
C011063 Sun shield. Protects against excessive heat build-up due to direct sunlight. Supplied with fixing rivets
C03005 Calibration adaptor
C01254 Carbon cloth filter (self-adhesive). Removes long-chain hydrocarbons
2575/1 Detector pulley system. Enables Xgard methane and hydrogen detectors to be lowered from a high level for calibration
00109A Calibration termination box (ABS box which allows gas to be applied to sensors remotely, a spray deflector or collector cone is also required)
M04214 PTFE tube 6 mm OD x 1 mm wall for use with calibration termination box


S011954  0-100% LEL methane plus general flammable gases. Supplied with bonded sensor retainer and Viton o-ring.
M04909  Sensor retainer O-ring. Viton.
M04910  Junction box lid O-ring. Viton.
S011720  Terminal support PCB
E07688  High-temperature terminal block.

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Title Size
Xgard-Datasheet 249 KB
Xgard Manual 1 MB
Xgard-Data-Sheet_es_ES 1 MB
Xgard-Data-Sheet_pt_BR 1 MB

Additional information

Weight 0.09 kg