Intrinsically Safe (I.S.) or Flameproof (Exd) versions are available, with case options comprising high-grade alloy, stainless steel or chemically resistant GRN polymer. Certifications include IECEx, ATEX and UL.

Low cost of ownership

  • Designed for easy installation and maintenance – keeps costs down
  • Three junction box options – designed to make replacement of sensors and sinters extremely simple. Spare sensors simply plug-in
  • Many spare parts are common to all Xgard models – keeps spares holding requirements to a minimum

Flexible installation options

  • The Xgard multi gas detectors are designed for either wall or ceiling mounting – no need for additional brackets
  • Can accommodate M20, 1/2″ NPT or 3/4″ NPT cable glands – suits all site requirements
  • High temperature models are available for hot environments (up to 150oc)
  • Accessories are available for duct mounting and sampling applications as well as remote gassing – simple sensor checking

Wide range of sensors

  • Poison resistant pellistors, for all flammable detection needs including hydrocarbons, hydrogen, ammonia, jet fuel, leaded petrol and vapours containing halogens
  • Electrochemical sensors are used to detect a vast range of toxic gases and oxygen
  • Thermal conductivity sensors are available to monitor % volume concentrations of gases

Rugged and reliable

  • Manufactured using a choice of three materials: glass reinforced nylon, highly durable aluminium with a tough polyester coating, or 316 stainless steel for ultimate corrosion resistance – designed to operate even in the harshest environments
  • Spray deflectors and weatherproof caps are available for use in areas subject to regular wash-downs, or offshore environments
  • All models have been validated to the functional safety standard IEC 61508 (SIL 1 to SIL 3)


Type 1Type 2Type 3Type 4Type 5Type 6Xsafe
Size156 x 166 x 111mm (6.1 x 6.5 x 4.3 inches)195 x 166 x 111mm (7.6 x 6.5 x 4.3 inches)156 x 166 x 111mm (6.1 x 6.5 x 4.3 inches)
WeightNylon: 0.5 kgAlloy: 1kg (2.2lbs)316 S/S: 3.1kg (6.8lbs)Aluminium: 1kg (2.2lbs)Stainless steel: 3.1kg (6.8lbs)1.5 kg (3.3lbs)Aluminium: 1kg (2.2lbs) Stainless steel: 3.1kg (6.8lbs)1kg (2.2lbs)
Enclosure materialATEX certified: Glass reinforced nylon or 316 S/SUL Certified: Aluminium or 316 S/SAluminium or 316 Stainless SteelAluminiumAluminium or 316 Stainless SteelAluminium
Ingress protectionIP65IP54IP65
Cable entries1 x M20, 1/2 “NPT or 3/4 NPT* on right-side
Terminations0.5 to 2.5mm2
Sensor typeElectrochemicalCatalytic bead316 S/S sensor housing with catalytic beadsCatalytic beadThermal conductivityCatalytic bead
Operating temperature-20 to +50 °C
(-4 to 122 °F)
(sensor dependant)
-20 to +50°C (-4 to 122°F)-40 to +80°C
(-40 to 176°F)
-20 to +150°C (-4 to 302°F)-40 to +55°C (-40 to 131°F)+10 to +55°C (50 to 301°F)mV: -40 to +80oC (-40 to 176oF)
mA: -40 to +55oC (-40 to 131oF
Humidity10 to 95% RH non-condensing0-99% RH non-condensing0-90% RH0-99% RH
Repeatability Zero drift<2% FSD (Typical)<2% FSD per Month (Typical)
Response timeT90 <15s OxygenT90 <30s to 120s Toxic(sensor dependant)T90 <15s (Typical)
Operating voltage8-30V dc2.0V dc +/- 0.1V (Typical)10-30V dcmA: 10- 30V dc mV:2.0Vdc
Power requirements24mA maximum300mA (Typical)50mA at 24V dc 1.2WMA:50mA at 24V dc 1.2W mV: 300mA (Typical)
Electrical output2- wire 4-20mA (current sink)3- wire mV bridgeTypical signal: 12-15mV/ %LEL CH43- wire mV bridgeTypical signal: >10mV/%LEL CH43- wire 4-20mA (current sink or source)mA: 3- wire 4-20mA (current sink or source) mV: 3- wire mV bridge
Typical signal: 12-15mV/ %LEL CH4
ApprovalsATEX: II 1 G
Exia IIC T4 Ga
(Tamb -40 to +55°C)
UL/cUL: Class I, Div. 1
Groups A, B, C, D
Exd IIC T6 Gb (Tamb -40 to +50°C)
UL: Class I, Div. 1
Groups B, C, D
Exd IIC T4 Gb
(Tamb -40 to +80°C)
Exd IIC T6 Gb (Tamb -40 to +50°C)
Ex tb IIIC
T180°C Db
UL: Class I, Div. 1
Groups B, C, D
ATEX: II 2 GDExd IIC T3 Gb (Tamb -40 to +150°C)ATEX: II 2 GDExd IIC T6 Gb (Tamb -40 to +50°C)
Exd IIC T4 Gb (Tamb -40 to +80°C)
Ex tb IIIC
T180°C Db
UL: Class I, Div. 1
Groups B, C, D
EMC complianceEN 50270       FCC Part 15    ICES- 003

*3/4 ” cable entry only available on aluminium juntion boxes.


Below is a small selection of the accessories available for the Crowcon Xgard. For a full list please contact Us.

Spray deflector


For outdoor installations and protection from water sprays, for example in water treatment or food processing plants. Includes accessory adaptor. (Not suitable for use with Xgard Type 4)

Sun shield


Protects against excessive heat build-up due to direct sunlight.
Supplied with fixing rivets.

Collector Cone


For aiding detection of light gases such as methane. 38cm/15″ Dia. Includes accessory adaptor. (Not suitable for use with Xgard Type 4)

Weatherproof cap


For offshore or other extremely wet environments. Includes accessory adaptor. (Not suitable for use with Xgard Type 4)

Flow adaptor


For use where a gas sample is being piped to the detector.

Calibration adaptor


To enable calibration gas to be applied to the detector. One adaptor can be used for several detectors.

Duct mounting kit


Allows sampling within tubes and ducts. Stainless steel plate with 6mm remote calibration fitting. Maximum duct airflow: 6 metres per second. (Not compatible with Stainless Steel Xgard or Xgard Type 4.)