I. Specification of Flamgard Plus flammable gas analyzer

Flammable gas detector Flamgard Plus


  • The Flamgard Plus is a flammable gas (Exd) detector that uses toxic flame retardants to detect explosive levels of hydrocarbons, hydrogen and other flammable gases and vapors, including aviation fuels and gasoline vapors.

Non-intrusive calibration:

  • Calibration can be performed on-site without hot work permits – minimizing downtime.
  • Local display and buttons allow calibration without opening the junction box.

Flexible output options:

  • 4-20mA current source or source – works with a wide selection of control boards.
  • 3-wire format
  • Optional relay for alarms and faults – can be used for local alarm switching.

Sure and reliable:

  • The Flamgard Plus Crowcon Flammable Gas Detector is built in marine aluminum with a stainless steel sensor housing – a proven track record for operating in the harshest environments.
  • Ingress protection according to IP65.

Low cost:

  • Intrusive calibration – easy to operate and maintain
  • Long-life sensor – keep on-site operation to a minimum
  • Simple spare parts replacement.

A wide range of sensors:

  • Catalytic particle selection for a wide selection of flammable gases and vapors – the right gas detector for your requirements.

***Discover more of GMGA’s stationary and portable gas detectors and testers at:

II. Specifications of Flammable gas detector Flamgard Plus

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
Ex db IIC T6 Tamb -20°C to +55°C
EMC compliance EN 50270, FCC: CFR 47 Part 15, ICES-003
* Figures shown exclude the sensors – Please contact Crowcon for a full list of sensor operating temperatures

Gas And Range


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

0-100% LEL

Hydrogen (H2)

4 0-100% LEL

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


***Videos of fixed flammable gas detectors are available at: Gmga Measuring Youtube.


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