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 or 1/2″ 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 1 Type 2 Type 3 Type 4 Type 5 Type 6 Xsafe
Size 156 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)
Weight Nylon: 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 material ATEX certified: Glass reinforced nylon or 316 S/SUL Certified: Aluminium or 316 S/S Aluminium or 316 Stainless Steel Aluminium Aluminium or 316 Stainless Steel Aluminium
Ingress protection IP65 IP54 IP65
Cable entries 1 x M20, or 1/2 “NPT on right-side
Terminations 0.5 to 2.5mm2
Sensor type Electrochemical Catalytic bead 316 S/S sensor housing with catalytic beads Catalytic bead Thermal conductivity Catalytic 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
Humidity 10 to 95% RH non-condensing 0-99% RH non-condensing 0-90% RH 0-99% RH
Repeatability Zero drift <2% FSD (Typical)<2% FSD per Month (Typical)
Response time T90 <15s OxygenT90 <30s to 120s Toxic(sensor dependant) T90 <15s (Typical)
Operating voltage 11-30V dc 2.0V dc +/- 0.1V (Typical) 10-30V dc mA: 10- 30V dc mV:2.0Vdc
Power requirements 24mA maximum 300mA (Typical) 50mA at 24V dc 1.2W MA:50mA at 24V dc 1.2W mV: 300mA (Typical)
Electrical output 2- wire 4-20mA (current sink) 3- wire mV bridgeTypical signal: 12-15mV/ %LEL CH4 3- wire mV bridgeTypical signal: >10mV/%LEL CH4 3- 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
Approvals ATEX: 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/IECEx: II 2 GD

Ex db IIC T4 Gb – Ex tb IIIC T110˚C Db

(Tamb -40 to +80˚C)

Ex db IIC T6 Gb – Ex tb IIIC T80˚C Db

(Tamb -40 to +50˚C)

UL : Class I, Div 1

Groups B, C, D

EMC compliance EN 50270       FCC Part 15    ICES- 003

*3/4 ” cable entry only available on aluminium junction 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.)





Product Presentation

Additional information

Gas options

Acetylene (C2H2), Argon (Ar), Arsine (AsH3), Bromine (BR2), Butane (C4H10), Carbon Dioxide (CO2), Diborane (B2H6), Ethane (C2H6), Ethylene (C2H4), Ethylene oxide (C2H4O), Germane (GeH4), Helium (He), LPG, Pentane (C5H12), Petrol vapour, Propane (C3H6), Silane (SiH4), Vinyl chloride (VCM) (CH2 = CHCI, Volatile organics (VO), Ammonia (NH3), Carbon monoxide (CO), Chlorine (Cl2), Chlorine dioxide (ClO2), Fluorine (F2), Hydrogen (H2), Hydrogen chloride (HCL), Hydrogen cyanide (HCN), Hydrogen fluoride (HF), Hydrogen sulphide (H2S), Methane (CH4), Nitric oxide (NO), Nitrogen dioxide (NO2), Oxygen (O2), Ozone (O3), Phosgene (COCL2), Phosphine (PH3), Sulphur dioxide (SO2)

Number of gases



Type 1 – Nylon: 0.5kg (1.1 lbs) Alloy: 1kg (2.2 lbs) 316 S/S: 3.1kg (6.8 lbs), Type 2, 3, 5, 6 – Aluminium: 1kg (2.2 lbs) Stainless steel: 3.1kg (6.8lbs), Type 4 – 1.5kg (3.3 lbs), Xsafe – 1kg (2.2 lbs)