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Flamgard Plus

Flammable gas detector with display



Flamgard Plus is a Flameproof (Exd) flammable gas detector which uses poison-resistant pellistors to detect explosive levels of hydrocarbons, hydrogen and other flammable gases and vapours, including aviation fuel and leaded petrol vapours.

Non-intrusive calibration

  • Calibration can be performed locally without the need for hot work permits - minimises operational down-time
  • Local display and buttons enable calibration without opening the junction box

Flexible output options

  • 4-20mA current sink or source - works with a wide selection of control panels
  • 3 wire format
  • Optional relays for alarm and fault - can be used for switching local alarms

Rugged and reliable

  • Constructed using marine-grade aluminium with a stainless steel sensor housing - proven track record for operation in the harshest environments
  • Ingress protection to IP65 as standard

Low cost of ownership

  • Non-intrusive one man calibration - easy to operate and maintain
  • Long life sensors - keeps interuption to on-site activity to a minimum
  • Simple parts replacement

Wide range of sensors

  • Choice of catalytic beads for a wide selection of flammable gases and vapours - gas detector tailored to your requirements

Contact [email protected] for more information.



Size 200 x 115 x 115mm (7.9 x 6.1 x 6.1ins)
Weight 2.2kg (4.9lbs)
Ingress protection IP65
Enclosure material Junction box: Marine grade alloy
Sensor housing: 316 stainless steel
Power 10-30Vdc, 210mA max (relay version)
160mA max (non relay)
Cable entries 2 x M20 or 1/2” NPT
Operating temperature -10°C to +55°C (-14°F to 131°F) *
Humidity 0 to 99% RH non-condensing
Relays (optional) SPNO or SPNC contacts rated
30Vdc 1A (non-inductive load) for Alarm 1, Alarm 2, Fault
Display 3-digit LCD back-lit display, LED status indicator
Calibration method Via magnetically operated buttons
Electrical output 3 wire 4-20mA, sink or source
Terminals Suitable for up to 1.5mm2 cable
Sensor type Catalytic bead
Repeatability +/- 2% FSD typically
Zero drift +/- 2% FSD, 6 months typically
Response time T90 <15 seconds typically
Performance Tested in accordance with EN60079-29-1
Hazardous area zones Zone 1 or 2
Approvals Ex II 2 G
Exd IIC T6 Gb
UL Class I Zone 1
EMC compliance EN 50270, FCC, ICES-003

* Figures shown exclude the sensors - Please contact Crowcon for a full list of sensor operating temperatures

Gases and Ranges

Gas LEL (% vol.) Range Available
Acetylene (C2H2)*  2.3 0-100% LEL
Ammonia (NH3)        15 0-100% LEL
Butane (C4H10 1.4 0-100% LEL
Ethanol (C2H5OH) 3.1 0-100% LEL
Ethane (C2H6) 2.4 0-100% LEL
Ethylene (C2H4) 2.3 0-100% LEL
Hexane (C6H14) 1.0 0-100% LEL
Hydrogen (H2) 4 0-100% LEL
LPG 2 0-100% LEL
Methane (CH4) 4.4 0-100% LEL
Methanol (CH3OH)  6 0-100% LEL
Pentane (C5H12) 1.1 0-100% LEL
 Petrol vapor   1.3 0-100% LEL
Propane (C3H8) 1.7 0-100% LEL
Propanol (C3H8O) 2.1 0-100% LEL


















LEL figures derived from EN60079-20-1:2010
*Acetylene option not available on UL certified version 

For a full list of gases download the datasheet or Crowcon.



Below is a small selection of the accessories available for the Crowcon Flamgard Plus. For a full list please call 01235 557700 or Contact Us.

Spray deflector


For use outdoor installations and to protect from water sprays, for example in water treatment or food processing plants. For extremely wet environments eg: offshore installations, use weatherproof cap, CO1442, instead.

Weatherproof cap


For offshore or other extremely wet environments in place of spray deflector.

Collector cone


For aiding detection of light gases such as methane. 38cm/15" Dia. Includes accessory adaptor.

Stainless steel flow adaptor


For use where a gas sample is being piped to the detector. For 96HD type sensors.

Self adhesive carbon cloth filter


Removes long chain hydrocarbons where these can be a problem.

Exd Cable Gland Adaptors

ATEX certified Exd cable gland adaptors.

Exd/Exe Certified Brass Cable gland


Suitable for Steel Wire Armoured cables with outside diameter 15.5mm to 21.1mm (inner sheath 6.7mm to 14mm). Certified to ATEX (ll 2DG, Exd llC/Exe ll), IECEx, CSA, GOST-R and NEPSI standards. M20 x 1.5mm thread. Ingress protection to IP66/67/68.

Calibration adaptor


To enable calibration gas to be applied to the detector. One adaptor can be used for several detectors.

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