General Details

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

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 or1/2“NPT cable entries.


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

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 14-32Vdc. <4W
Display Main display – OLED 128 x 64 pixels, yellow text on black background
Indicators – Amber, 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)
Foundation Fieldbus (option pending, contact Crowcon)
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 -40°C to +75°C (-40°F to +167°F)†
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 d ia IIC T4 Gb (-40 to +75°C)
Performance Designed for compliance with:
EN60079-29-1 (flammable gas sensors)*
EN50104 (oxygen sensors)*
EN45544 (toxic gas sensors)*
Functional safety IEC61508, EN50402 SIL 2
EMC Compliance EN50270:2015
FCC CFR47 Part 15B

† Note: sensor operating temperature and humidity limits vary widely. Contact Crowcon for specific sensor data.

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

Gases and Ranges

Gas Units Max
Alarm 1
Alarm 2
range °C 
Carbon monoxide (CO) ppm 1000 250  30 200 -30 to +50
Hydrogen (H2) %LEL 100  100  20  40 -40 to +65
Hydrogen fluoride (HF) ppm 10 10 1.8 3 +5 to +40
Hydrogen sulphide (H2S) ppm 200  25 5 10 -30 to +50
LPG %LEL 100 100 20 40 -40 to +65
Methane (CH4) %LEL 100 100 20 40 -40 to +65
Oxygen (O2) %Vol  30 25 19 (falling) 17 (falling) -20 to +50
Product Video

Basic Operations

  1. Start-up Sequence
  2. Alarma indication
  3. Checking fitted options


    Advanced Features

    1. Sensor zero
    2. Sensor calibration
    3. Sensor module replacement


    Bump Testing

    1. Speedy bump test
    2. Smart bump test