Crowcon Xgard

Crowcon Xgard Fixed Gas Detector

The Crowcon Xgard range offers a comprehensive selection of fixed point gas detectors that meet the diverse requirements gas detection in industries throughout the world. This includes many water treatment, oil and gas, power, research facility and manufacturing installations. Intrinsically Safe (I.S.) or Flameproof (Exd) versions are available for a wide range of applications. Xsafe is a cost effective solution for flammable gas detection in safe areas such as boiler rooms, kitchens and commercial buildings.

Xgard Sensors:

  • Poison resistant pellistors for flammable gas detection
  • Electrochemical sensors are used to detect toxic gases and oxygen
  • Thermal conductivity sensors to monitor volume concentrations of gases

Find out more on our sister site Cadmus Products.

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Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product.

Xgard Types

  • Xgard Type 1: Intrinsically safe toxic and oxygen gas detector
  • Xgard Type 2: Flameproof toxic and oxygen gas detector
  • Xgard Type 3: Flameproof flammable gas detector
  • Xgard Type 4: Flameproof high temperature flammable gas detector
  • Xgard Type 5: Flameproof flammable gas detector with 4-20mA output
  • Xgard Type 6: Flameproof thermal conductivity type gas detector
  • Xsafe: Safe area flammable gas detector


Low cost of ownership

Xgard detectors are designed for easy installation and maintenance to keep costs down. The three junction box options are all designed to make replacement of sensors and sinters extremely simple.

Spare sensors simply plug-in.

Xgard Types 1 and 2 utilise oxygen sensors with a 2- year life-span, so sensor replacement costs are halved when compared to conventional oxygen detectors. Many spare parts are common to all Xgard models, which keeps spares holding requirements to a minimum.

Flexible installation options

Xgard is designed for either wall or ceiling mounting without the need for additional brackets. Xgard can accommodate M20, 1/2" NPT or 3/4" NPT cable glands to suit 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 for simple sensor checking.

Wide range of sensors

Xgard offers an extremely wide range of sensors for all applications.

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

Xgard is 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. All versions are designed to operate even in the harshest conditions.

Spray deflectors and weatherproof caps are available for use in areas subject to regular wash-downs, or offshore environments.


Type 1 Type 2 Type 3 Type 4 Type 5 Type 6
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)
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
Ingress protection IP65 IP54 IP65
Cable entries 1 x M20, 1/2 “NPT or 3/4 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
Operating temperature -40 to +50 °C
(-40 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)
Humidity 10 to 95% RH non-condensing 0-99% RH non-condensing 0-90% 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 8-30V dc 2.0V dc +/- 0.1V (Typical) 10-30V dc
Power requirements 24mA maximum 300mA (Typical) 50mA at 24V dc 1.2W
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)
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: 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 compliance EN 50270       FCC Part 15    ICES- 003

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


Xgard Type 1 Spare Sensor Modules

  • S011667/S 0-25ppm, ammonia
  • S011566/S 0-50ppm, ammonia
  • S011567/S 0-100ppm, ammonia
  • S012022/S 0-100ppm, ammonia (low temp., -40C)
  • S011673/S 0-250ppm, ammonia
  • S011677/S 0-500ppm, ammonia
  • S011679/S 0-1000ppm, ammonia
  • S011830/S 0-1ppm, arsine
  • S011658/S 0-3ppm, bromine
  • S011557/S 0-5ppm, bromine
  • S011572/S 0-50ppm, carbon monoxide
  • S011574/S 0-100ppm, carbon monoxide
  • S011576/S 0-150ppm, carbon monoxide
  • S011578/S 0-200ppm, carbon monoxide
  • S011259/S 0-250ppm, carbon monoxide
  • S011580/S 0-300ppm, carbon monoxide
  • S011582/S 0-500ppm, carbon monoxide
  • S011584/S 0-1000ppm, carbon monoxide
  • S011586/S 0-2000ppm, carbon monoxide
  • S011588/S 0-3ppm, chlorine
  • S011263/S 0-5ppm, chlorine
  • S011590/S 0-10ppm, chlorine
  • S011592/S 0-15ppm, chlorine
  • S011594/S 0-20ppm, chlorine
  • S011596/S 0-30ppm, chlorine
  • S011598/S 0-50ppm, chlorine
  • S011600/S 0-100ppm, chlorine
  • S011690/S 0-1ppm, chlorine dioxide
  • S011831/S 0-1ppm, diborane
  • S011558/S 0-10ppm, ethylene oxide
  • S011659/S 0-50ppm, ethylene oxide
  • S011515/S 0-100ppm, ethylene oxide
  • S011565/S 0-1ppm, fluorine
  • S011832/S 0-2ppm, germane
  • S011704/S 0-200ppm, hydrogen
  • S011706/S 0-500ppm, hydrogen
  • S011562/S 0-2000ppm, hydrogen
  • S011834/S 0-4% vol. (0-100% LEL ) hydrogen
  • S011707/S 0-10ppm, hydrogen chloride
  • S011708/S 0-25ppm, hydrogen chloride
  • S011829/S 0-25ppm, hydrogen cyanide
  • S011602/S 0-30ppm, hydrogen cyanide
  • S011564/S 0-10ppm, hydrogen fluoride
  • S011604/S 0-2ppm, hydrogen sulphide
  • S011606/S 0-5ppm, hydrogen sulphide
  • S011608/S 0-10ppm, hydrogen sulphide
  • S011610/S 0-20ppm, hydrogen sulphide
  • S011257/S 0-25ppm, hydrogen sulphide
  • S011612/S 0-30ppm, hydrogen sulphide
  • S011614/S 0-50ppm, hydrogen sulphide
  • S011616/S 0-100ppm, hydrogen sulphide
  • S011618/S 0-200ppm, hydrogen sulphide
  • S011620/S 0-250ppm, hydrogen sulphide
  • S011622/S 0-300ppm, hydrogen sulphide
  • S011624/S 0-1000ppm, hydrogen sulphide
  • S011634/S 0-5ppm, nitrogen dioxide
  • S011561/S 0-10ppm, nitrogen dioxide
  • S011288/S 0-50ppm, nitric oxide
  • S011289/S 0-100ppm, nitric oxide
  • S011626/S 0-30ppm, nitrogen dioxide
  • S011628/S 0-50ppm, nitrogen dioxide
  • S011630/S 0-100ppm, nitrogen dioxide
  • S011563/S 0-1ppm, ozone
  • S011265/S 0-25% vol. oxygen
  • S011833/S 0-1ppm, phosgene
  • S011698/S 0-1ppm, phosphine
  • S011568/S 0-2ppm, phosphine
  • S011685/S 0-1ppm, silane
  • S011636/S 0-5ppm, sulphur dioxide
  • S011638/S 0-10ppm, sulphur dioxide
  • S011640/S 0-15ppm, sulphur dioxide
  • S011644/S 0-20ppm, sulphur dioxide
  • S011646/S 0-50ppm, sulphur dioxide
  • S011652/S 0-100ppm, sulphur dioxide
  • S011654/S 0-250ppm, sulphur dioxide
  • S011560/S 0-100ppm, volatile organics

Xgard Type 2 Spare Sensor Modules

  • S011572/S 0-50ppm carbon monoxide
  • S011574/S 0-100ppm carbon monoxide
  • S011576/S 0-150ppm carbon monoxide
  • S011578/S 0-200ppm carbon monoxide
  • S011259/S 0-250ppm carbon monoxide
  • S011580/S 0-300ppm carbon monoxide
  • S011582/S 0-500ppm carbon monoxide
  • S011584/S 0-1000ppm carbon monoxide
  • S011704/S 0-200ppm hydrogen
  • S011706/S 0-500ppm hydrogen
  • S011562/S 0-2000ppm hydrogen
  • S011604/S 0-2ppm hydrogen sulphide
  • S011606/S 0-5ppm hydrogen sulphide
  • S011608/S 0-10ppm hydrogen sulphide
  • S011610/S 0-20ppm hydrogen sulphide
  • S011257/S 0-25ppm hydrogen sulphide
  • S011612/S 0-30ppm hydrogen sulphide
  • S011614/S 0-50ppm hydrogen sulphide
  • S011616/S 0-100ppm hydrogen sulphide
  • S011618/S 0-200ppm hydrogen sulphide
  • S011265/S 0-25% vol.oxygen

Xgard Type 3 and 5 Spare Sensor Modules

  • S011509/S 0-100% LEL methane - pellister - pellister VQ21T
  • S011511/S 0-100% LEL pentane - pellister VQ21T
  • S011513/S 0-100% LEL hydrogen - pellister VQ21T
  • S011517/S 0-100% LEL ethanol - pellister VQ21T
  • S012162/S 0-100% LEL methanol - pellister VQ21T
  • S011518/S 0-100% LEL acetylene - pellister VQ21T
  • S011519/S 0-100% LEL butane2 - pellister VQ21T
  • S011520/S 0-100% LEL ethane - pellister VQ21T
  • S011521/S 0-100% LEL ethylene - pellister VQ21T
  • S011522/S 0-100% LEL LPG - pellister VQ21T
  • S011523/S 0-100% LEL propane - pellister VQ21T
  • S011524/S 0-100% LEL petrol vapour (unleaded) - pellister VQ21T
  • S012171/S 0-25% LEL hydrogen - pellister VQ21T
  • S012003/S 0-100% LEL acetaldehyde - pellister 300P
  • S012973/S 0-100% LEL hexane - pellister VQ21T
  • S012977/S 0-100% LEL isopropyl alcohol (IPA) - pellister VQ21T
  • S0111001/S 0-100% LEL toluene - pellister VQ21T
  • S011506/S 0-100% LEL petrol vapour (leaded) - pellister VQ8
  • S011840/S 0-100% LEL ethylene dichloride (EDC) - pellister VQ25
  • S012972/S 0-100% LEL vinyl chloride monomer (VCM) - pellister VQ25
  • S011487/S 0-100% LEL jet fuel - pellister VQ41T
  • S011489/S 0-25% LEL ammonia - pellister VQ41T
  • S012988/S 0-100% LEL methane - pellister NP-30𔅀-100% LEL methane - pellister NP-30†
  • S012989/S 0-100% LEL pentane - pellister NP-30𔅀-100% LEL pentane - pellister NP-30†
  • S012990/S 0-100% LEL butane - pellister NP-30𔅀-100% LEL butane - pellister NP-30†
  • S012991/S 0-100% LEL propane - pellister NP-30𔅀-100% LEL propane - pellister NP-30†

† very high poison resistance† very high poison resistance

Xgard Type 4 Spares

  • 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.

Xgard Type 6 Spare Sensor Modules

  • S011540/S 0-5% vol. hydrogen (in air)
  • S011542/S 0-10% vol. hydrogen (in air)
  • S011544/S 0-50% vol. hydrogen (in air)
  • S011548/S 0-20% vol. hydrogen (in nitrogen)
  • S011550/S 0-25% vol. hydrogen (in nitrogen)
  • S011494/S 0-30% vol. hydrogen (in nitrogen)

Xsafe Spare Sensor Modules

  • S011509/S 0-100% LEL methane - pellister VQ21T
  • S011523/S 0-100% LEL propane/LPG - pellister VQ21T

Xgard and Xsafe General Spares

  • S012132/S 9: Sensor retainer (aluminium) - Type 1 UL and MED certified only
  • S012982 9: Sensor retainer (nylon)* includes sensor seal - Xgard Type 1 ATEX only
  • S012133/S 9: Sensor retainer with sinter (aluminium)† Types 2,3,5,6, IR
  • M04885 7: Sensor seal (for aluminium and nylon sensor retainers)† Types 1,2,3,5,6, IR
  • M01945 9: Sensor retainer (stainless steel) - Type 1 only
  • M01932 9: Sensor retainer with sinter (stainless steel)† Types 2,3,5,6, IR
  • M04971 7: Sensor seal (for stainless steel sensor retainer)† Types 1,2,3,5,6, IR
  • M04828 16: Sensor retainer O-ring† Types 1,2,3,5,6, IR (aluminium and S/S junction box)
  • M04481 16: Sensor retainer O-ring† Type 1 Nylon Junction Box
  • M04829 5: Junction box lid O-ring† Types 1,2,3,5,6, IR
  • S011238/2 10: Amplifier PCB for the following gas types: carbon monoxide, chlorine dioxide, hydrogen, hydrogen sulphide, nitrogen dioxide, sulphur dioxide. Types 1 & 2 only.
  • S011896/2 10: Amplifier PCB for the following gas types: ammonia, arsine, bromine, chlorine (2008 onwards) diborane, ETO, fluorine, germane, hydrogen cyanide, HCL, hydrogen fluoride, nitric oxide, ozone, phosgene, phosphine, silane. Type 1 only.
  • S011240/2 10: Amplifier PCB (oxygen) - Types 1 & 2
  • S011469/2 10: Amplifier PCB (flammable, bridge) - Type 3 & Xsafe mV
  • S011242/2 10: Amplifier PCB (flammable, 4-20mA) - Type 5, IR & Xsafe mA
  • S011837 10: Amplifier PCB (thermal conductivity, 4-20mA) - Type 6
  • M04770 4: PCB cover† Types 1,2,3,5,6, IR
  • M04972 12: I.S. PCB cover† Type 1 only, required in addition to M04770 PCB cover.
  • C011211 : Pellistor module balancing lead
  • S011819/2 11: Sensor module PCB with no gain resistors. Resistors must be fitted to suit the gas sensor and range.