XgardIQ is an intelligent and versatile fixed detector and transmitter compatible with Crowcon’s full range of sensor technologies. Available fitted with a variety of sensors for fixed flammable, toxic, oxygen or H2S gas detection.

Providing analogue 4-20mA and RS-485 Modbus signals as standard, XgardIQ is optionally available with Alarm and Fault relays and HART communications. The 316 stainless steel are available with three M20 or 1/2“NPT cable entries.

(SIL-2) Safety integrity level 2 certified fixed detector.

Easy and safe to use

  • OLED display – Bright, clear display indicates gas level and detector status even in dark locations
  • Non-intrusive calibration – Zero and calibration functions are performed via the display and keypad, without the need for a hot-work permit or any special tools (e.g. no magnetic wand required)
  • +ve Safety indicator – Confirms the detector is operating safely at a glance
  • Event log function – Stores all alarm, fault and maintenance events to provide a history of detector use
  • Remote sensor – Improves probability of detection

Simple installation and maintenance

  • Universal transmitter – Common transmitter for Crowcon’s full range of sensor technologies
  • Hot-swap sensor modules – Sensors can easily be replaced using one hand without requiring tools or a hot-work permit
  • Auto-sense function – Automatically detects whether the control system is 4-20mA current sink or source and sets itself appropriately, eliminating the risk of being incorrectly set
  • Auto-configure function – Detects when a sensor module is plugged-in and uploads the appropriate gas type, range, units and alarm levels


  • Smart Bump and Speedy Bump test functions – Enable sensor health and response to be verified quickly and easily using test gas. Process is automated and provides a reminder when a bump test is due
  • Calibration due warning – Reminds the user when calibration is due to ensure that sensors remain operational and accurate at all times
  • Sensor range selection – User can set the full-scale range of the sensor via the display menu according to site or specific location requirements.


Size H278 x W140 x D89mm (10.9 x 5.5 x 3.5 in)
Weight 4.1Kg (9lbs)
Enclosure material 316 stainless steel
Ingress protection IP66
Connection Three M20 or ½”NPT cable gland entries.Certified, removable plugs are fitted to left-hand and lower righthand entries
Power 14-30 VDC. <4W
Display Main display – OLED 128 x 64 pixels, yellow text on black background
IndicatorsAmber, Red and Green LED’s for detector status; Blue +ve Safety LED
Electrical output 4-20mA current sink or source (Auto-Sense or manual selection); warning and fault signals are configurable. NAMUR NE 43 compliant
RS-485 Modbus RTU
HART 7 over 4-20mA signal and via local I.S. test points (optional)
Relays (optional)
Alarm 1, Alarm 2, Fault
SPCO contacts rated 5A, 230Vac
Relay configuration options

Energised or de-energised
Latching or non-latching
Rising or falling
Configurable On and Off delays on alarm relays.
Event logging Records alarm, fault and maintenance events. Events can be viewed on-screen and downloaded to a PC.
Operating temperature Transmitter only: -40°C to +75°C (-40°F to +167°F)†

Sensor type:

Oxygen: (-20°C to +50°C ambient)
Toxic: (-40°C to +50°C ambient)
Pellister: (-40°C to +75°C ambient)
Infra-red (IR): (-20°C to +55°C ambient)
High temperature toxic:  (-40⁰C to +70⁰C)

Humidity 0 to 95% RH non-condensing†
Repeatability +/- 2% FSD
Zero drift +/- 2% FSD per year maximum
Response time Sensor dependant: contact Crowcon for specific sensor data.
Approvals ATEX and IECEx:
Ex II 2 G    Ex db ia IIC T4 Gb (see above for temperature ranges)
Performance Designed for compliance with:
EN50104 (oxygen sensors)
EN45544 (toxic gas sensors)*
EN50271 (software)
H2S performance standard
Functional safety IEC61508, EN50402 SIL 2
EMC Compliance EN50270:2015
FCC CFR47 Part 15B

† Note: sensor operating temperature and humidity limits vary widely.

* Features outstanding at the time of issue, contact Crowcon for details.

Gases and Ranges

Gas Units Max
Alarm 1
Alarm 2
range °C 
Oxygen (O2) %Vol 30 25 19 (falling) 17 (falling) -20 to +50
Ammonia PPM 100/1000 50 25 35 -20 to +40
 Carbon Monoxide (CO) PPM 1000 250 30 200  -30 to +50
Hydrogen Fluoride (HF) PPM 10 10 1.8 3 +5 to +40
Hydrogen Sulphide (H2S) PPM 100/200 25 5 10 -30 to +50
High Temperature Hydrogen Sulphide (H2S) PPM 100/200 25 5 10 -40 to +70
Ozone (O3) PPM 1 1 0.1 0.2 -20 to +40
Sulphur Dioxide (SO2) PPM 100 10 1 1 -30 to +50
Hydrogen (H2) %LEL 100 100 20 40 -40 to +75
Methane (CH4) %LEL 100 100 20 40 -40 to +75
Pentane (C5H12) %LEL 100 100 20 40 -40 to +75
Propane (C3H8) %LEL 100 100 20 40 -40 to +75
Ethanol (IR sensor) %LEL 100 100 20 40 -20 to +55
LPG (IR sensor) %LEL 100 100 20 40 -20 to +55
Methane (IR sensor) %LEL 100 100 20 40 -20 to +55
Propane (IR sensor) %LEL 100 100 20 40 +10 to + 55


Below is a small selection of the accessories available for the XgardIQ.

Calibration cap


Clips to the XgardIQ transmitter for application of calibration/bump test gas

Splash Guard


For outdoor installations and sensor protection from water sprays. Includes pipe spigot for application of bump test gas.

Flow Adaptor


For gas sampling applications

Dummy Sensor Module


Maintains IP rating of the XgardIQ transmitter when no sensor module is installed.

Pipe Mounting Kit


Stainless steel u-bolts, nuts and washers to enable XgardIQ to be rigidly mounted to a 50mm (2″) pipe. Maximum pipe diameter: 60mm

Collector Cone


Clips to the XgardIQ remote sensor housing to aid detection of lighter than air gases such as hydrogen or methane

Sun Shade (SS316)


Protects the detector from elevated temperatures due to direct sunlight

Sun Shade (SS304)


Protects the detector from elevated temperatures due to direct sunlight

XgardIQ remote sensor assembly 5 metre cable


XgardIQ remote sensor assembly 15 metre cable


Duct mounting kits


For ducts between 300mm and 3m wide, air-flow from 4 to 20m/s.






Technical Notes


Basic Operation:

  Start-up sequence

Includes: OLED display and LED functions when power is applied. Duration: 1m:19secs

Watch video

  Alarm indication

  Checking fitted options

Includes: procedure for checking whether HART or Relay options are included. Duration: 21secs

Watch video

Advanced Features:

  Sensor zero

Includes: sensor zero wizard function. Duration: 52secs

Watch video

  Sensor calibration

Includes: using the sensor calibration wizard function. Duration: 2m:33secs

Watch video

  Sensor module replacement

Includes: procedure for swapping sensor module types. Duration: 1m:50secs

Watch video

Bump testing:

  Speedy bump test

Includes: performing a quick bump test to verify the sensor is working correctly with a minimum quantity of gas. Duration: 1m:29secs

Watch video

  Smart bump test

Includes: performing a smart bump test to ensure the sensor responds correctly to a specified concentration of gas. Duration: 2m:50secs

Watch video