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Xgard Fixed Point Gas Detector LEL/Toxic/O2



Crowcon Xgard – Gas detectable list:

  • Crowcon Xgard Ammonia (NH3)
  • Crowcon Xgard Ammonia (NH3) High ppm
  • Crowcon Xgard Ammonia (NH3) Low-Temp
  • Crowcon Xgard Arsine (AsH3)
  • Crowcon Xgard Bromine (Br2)
  • Crowcon Xgard Carbon Monoxide (CO)
  • Crowcon Xgard Chlorine (CI2)
  • Crowcon Xgard Chlorine Dioxide (CLO2)
  • Crowcon Xgard Diborane (B2H6)
  • Crowcon Xgard Ethylene Oxide (ETO)
  • Crowcon Xgard Fluorine (F2)
  • Crowcon Xgard Germane (G2H4)
  • Crowcon Xgard Hydrogen (H2)
  • Crowcon Xgard Hydrogen Chloride (HCI)
  • Crowcon Xgard Hydrogen Cyanide (HCN)
  • Crowcon Xgard Hydrogen Fluoride (HF)
  • Crowcon Xgard Hydrogen Sulfide (H2S)
  • Crowcon Xgard Nitric Oxide (NO)
  • Crowcon Xgard Nitrogen Dioxide (NO2)
  • Crowcon Xgard Oxygen (O2)
  • Crowcon Xgard Oxygen (O2) Marine
  • Crowcon Xgard Ozone (O3)
  • Crowcon Xgard Phosgene (COCL2)
  • Crowcon Xgard Phosphine (PH3)
  • Crowcon Xgard Silane (SiH4)
  • Crowcon Xgard Sulphur Dioxide (SO2)
  • Crowcon Xgard Volatile Organics (VO)


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, UL, GOST-R and MED.

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

  • 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)



Ranges Available

Ammonia (NH3)0-50, 100ppm (-20 Celsius min.)
Ammonia (NH3) High ppm0-250, 500, 1000ppm (-20 Celsius min.) 4-6 Weeks Lead Time
Ammonia (NH3) Low-Temp0-100ppm (-40 Celsius min.)
Arsine (AsH3)0-1ppm – 6 Weeks Lead Time
Bromine (Br2)0-3ppm
Carbon Monoxide (CO)0-50, 100, 200, 250, 500, 1000, 2000ppm
Chlorine (CI2)0-3, 5, 10, 20, 50, 100ppm
Chlorine Dioxide (CLO2)0-1ppm
Diborane (B2H6)0-1ppm – 6 Weeks Lead Time
Ethylene Oxide (ETO)0-10, 50, 100ppm
Fluorine (F2)0-1ppm – 4-6 Weeks Lead Time
Germane (G2H4)0-2ppm – 6 Weeks Lead Time
Hydrogen (H2)0-200, 2000ppm, 0-100% LEL
Hydrogen Chloride (HCI)0-10, 25ppm
Hydrogen Cyanide (HCN)0-25ppm
Hydrogen Fluoride (HF)0-10ppm
Hydrogen Sulfide (H2S)0-5, 10, 20, 25, 50, 100, 200, 250, 300, 1000ppm
Nitric Oxide (NO)0-25, 50, 100ppm
Nitrogen Dioxide (NO2)0-10, 50, 100ppm
Oxygen (O2)0-25% Volume
Oxygen (O2) Marine0-25% Volume
Ozone (O3)0-1ppm
Phosgene (COCL2)0-1ppm
Phosphine (PH3)0-1ppm
Silane (SiH4)0-1ppm – 6 Weeks Lead Time
Sulphur Dioxide (SO2)0-10, 20, 50, 100, 250ppm
Volatile Organics (VO)0-100ppm


 Type 1Type 2Type 3Type 4Type 5Type 6
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)
Enclosure materialATEX certified: Glass reinforced nylon or 316 S/SUL Certified: Aluminium or 316 S/SAluminium or 316 Stainless SteelAluminiumAluminium or 316 Stainless Steel
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 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)
Humidity10 to 95% RH non-condensing0-99% RH non-condensing0-90% 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 dc
Power requirements24mA maximum300mA (Typical)50mA at 24V dc 1.2W
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)
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




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