Flamgard Plus Flammable gas detector with display

General Details

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
  • 2 or 3 wire formats
  • 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
  • Made from tough carbon loaded nylon
  • 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
  • Extensive range of electrochemical sensors for toxic gases and oxygen
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
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