Crowcon Flamgard Plus Flammable Fixed Detector

  • Hydrocarbons, hydrogen & other flammable gases
  • Catalytic bead sensor
  • Intuitive display

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Effective 15th of March 2024, the Flamgard Plus will no longer be available.

The Xgard Bright series offers enhanced features and is a direct replacement for the Flamgard Plus.

A flameproof (Ex d) pellistor-based flammable gas detector with a display & 4-20mA output for hydrocarbon, hydrogen & petrol gas and vapour detection.

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


Non-intrusive calibration

  • Calibration can be performed locally without hot work permits – minimising operational downtime.
  • Local display and buttons enable calibration without opening the junction box
  • Magnetic wand supplied

Flexible output options

  • 4-20mA current sink or source – works with a wide selection of control panels
  • Three-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
  • Flameproof (Ex d)

Low cost of ownership

  • Non-intrusive one-person calibration – easy to operate and maintain
  • Long-life sensors – keep interruption to on-site activity to a minimum
  • Simple parts replacement

Range of sensors

  • Choice of catalytic beads for a wide selection of flammable gases and vapours – this flammable, hydrocarbon and hydrogen gas detector can be tailored to your requirements


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 Three-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, six 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

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Title Size
TXgard-flamgard-plus-Datasheet 213 KB
Flamgard-Plus-Manual-Issue-8 121 KB

Additional information

Weight 0.09 kg

Ordering Information

Flamgard Plus
FLP-0026 Flamgard Plus (A)-BUTANE 0-100% LEL-RELAY-SIRA-M20
FLP-0081 Flamgard Plus (A)-ETHANOL 0-100%LEL-RELAY-M20-SIRA
FLP-0150 Flamgard Plus (A)-ETHYLENE 0-100%-RELAY-M20 SIRA
FLP-0025 Flamgard Plus (A)-HEXANE 0-100% LEL-RELAY-SIRA-M20
FLP-0040 Flamgard Plus (A)-HYDROGEN 0-100%LEL-RELAY-SIRA-1/2
FLP-0051 Flamgard Plus (A)-LPG 0-100% LEL-RELAY-SIRA-M20
FLP-0055 Flamgard Plus (A)-METHANE 0-100% LEL-RELAY-SIRA-1/2 NPT
FLP-0136 Flamgard Plus (A)-METHANOL 0-100% LEL-ANALOGUE-M20 SIRA
FLP-0078 Flamgard Plus (A)-PENTANE 0-100% LEL-RELAY-M20 SIRA
FLP-0154 Flamgard Plus (A)-PETROL 0-100% LEL-VQ21-RELAY-M20 SIRA
FLP-0053 Flamgard Plus (A)-PROPANE 0-100% LEL-ANALOGUE-SIRA-M20
FLP-0050 Flamgard Plus (A)-PROPANE 0-100% LEL-RELAY-SIRA-M20
FLP-0044 Flamgard Plus (A)-PROPANOL 0-100% LEL-RELAY-SIRA-M20
FLP-0082 Flamgard Plus (A/VQ21)-Butane 0-100% LEL-Analogue-SIRA-M20
FLP-0184 Flamgard Plus (A/VQ21)-HYDROGEN 0-100% LEL-ANA-1/2NPT – SIRA
FLP-0169 Flamgard Plus (A/VQ21)-LPG 0-100% LEL-ANALOGUE-M20 SIRA
FLP-0131 Flamgard Plus (A/VQ21)-METHANE 0-100% LEL-ANA-1/2 NPT SIRA
FLP-0205 Flamgard Plus (G)-AMMONIA 0-100% LEL-REL-M20-SIRA
FLP-0132 Flamgard Plus (VQ21)-PENTANE 0-100% LEL-ANALOGUE-M20 SIRA
FLP-0048 Flamgard Plus Hydrogen 0-100%LEL, No Relays, M20, ATEX
FLP-0045 Flamgard Plus Hydrogen 0-100%LEL, Relays, M20, ATEX
FLP-0203 Flamgard Plus LPG 0-100% LEL-RELAYS-1/2NPT
FLP-0068 Flamgard Plus M20 SIRA CERT-(A)-METHANOL 0-100% LEL-RELAY
FLP-0007 Flamgard Plus M20 SIRA CERT-(G)-JET FUEL 0-100% LEL-ANALOGUE
FLP-0072 Flamgard Plus M20 SIRA CERT-(G)-JET FUEL 0-100% LEL-RELAY
FLP-0047 Flamgard Plus Methane 0-100%LEL, No Relays, M20, ATEX
FLP-0001 Flamgard Plus Methane 0-100%LEL, Relays, M20, ATEX
FLP-0077 Flamgard Plus NO SEN-ANALOGUE-M20 -ATEX
FLP-0022 Flamgard Plus NO SEN-RELAY-M20 -ATEX
Old Codes – Analogue – No Relays
FLP/A/A 0-100% LEL with a VQ21T pellistor – gas types available methane, pentane, propane, butane, hexane, hydrogen, LPG, methanol, ethanol, propanol, ethylene, ethane, toluene, petrol vapour (unleaded) and carbon disulphide.
FLP/G/A 0-100% LEL with VQ41 pellistor – ammonia (0-25%, 0-100% LEL) or jet fuel (0-100% LEL)
Old Codes – With Relays
FLP/A/R 0-100% LEL with VQ21T pellistor – gas types available methane, pentane, propane, butane, hexane, hydrogen, LPG, methanol, ethanol, propanol, ethylene, ethane, toluene, petrol vapour (unleaded) and carbon disulphide.
FLP/G/R 0-100% LEL with VQ41 pellistor – ammonia (0-25%, 0-100% LEL) or jet fuel (0-100% LEL)
Accessories (to fit 96HD)
C01052 Spray deflector. For outdoor installations & protection from water sprays.
C01442 Weatherproof cap
C01051 Collector cone. For aiding detection of light gases such as methane.
C01254 Carbon cloth filter (self adhesive). Removes long-chain hydrocarbons.
C01688 Stainless steel flow adapter for 96HD
C03005 Calibration adaptor
ATEX Certified Exd Cable Gland Adaptors
M02281 M20 to ¾” NPT (for standard Xgard, Exe or Exd Crowcon junction box)
M02354 Exd/Exe certified brass cable glands. Pack of 2. M20 x 1.5mm thread, suitable for steel wire armoured cables with outside diameter 15.5mm to 21.1mm (inner sheath 6.7mm to 14mm). Certified ATEX II 2 GD, Exd IIC/Exe II. Certified to ATEX, IECEx, CSA, GOST-R and NEPSI standards. IP66/67/68.
S011899 Flamgard Plus Amplifier with methane header (300P pellistor)
S011900 Flamgard Plus Amplifier with propane header
S011901 Flamgard Plus Amplifier with pentane header
S01865 Flamgard Plus Amplifier (no header) – specify gas
S01853 Amplifier header: methane (300P pellistor)
S01854 Amplifier header: pentane (VQ21T pellistor)
S01962 Amplifier header: hydrogen (VQ21T pellistor)
S011020 Amplifier header: propane (VQ21T pellistor)
S01905/3 Amplifier header: methane (VQ21T pellistor)

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