Crowcon Xgard Type 4 Fixed Gas Detector

Code: Xgard Type 4
  • Catalytic bead sensor for flammable gas
  • Suitable for high-temperature applications
  • Zones 1 or 2, Div 1 or 2

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The 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), which also contains the terminals to provide a three-wire mV Wheatstone Bridge output. Operating temperature -20 to +150°C. 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.  In wash down areas or marine applications, splash guards and weatherproof caps are available.


  • Simple install and maintenance, common spares for all Xgard types, minimise inventory
  • Validated to IEC 61508 (SIL 1 to SIL 3)Crowcon Xgard
  • Ingress protection IP54
  • 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 high level for calibration
00109A Calibration termination box (ABS box which enables gas to be applied to detectors 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

Weight0.09 kg