Crowcon Gasflag Gas Detection Control Panel

Code: C01803
  • Single channel control panel
  • Operates on 24Vdc supplied with or without a mains power supply
  • Loud 80dB sounder

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The Gasflag is a control panel for gas detection designed to monitor flammable, toxic or oxygen gas detectors with a 4-20mA output. It is suitable for light industrial or commercial applications such as monitoring LPG levels on garage forecourts, detecting chlorine in swimming pool dosing rooms, or detecting methane in boiler rooms.

The Gasflag is equipped with a loud sounder, bright LED indicators, and relays that can be used to trigger external devices such as audible/visual alarms or valves.


  • Clear system integrity indication
  • Accepts industry standard 4-20mA inputs
  • Alarm 1, Alarm 2 and Fault relays are fitted for switching external devices
  • Relay contacts are rated 1A 30Vdc maximum
  • Multiple units can be daisy-chained
  • Variable alarm configurations
  • Integral alarm outputs
  • Simple installation
  • Minimum maintenance
  • One button operation

Order Information

C01803 Gasflag single channel control unit
C01818 Gasflag single channel control unit (including 100-240 Vac power supply)
E07998 Gasflag power supply with a 1.4-metre lead and UK, EU, US & AUS plugs – 100-240 Vac

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Title Size
Crowcon GasFlag Datasheet 596 KB
Crowcon GasFlag Manual 274 KB

Additional information

Weight 0.09 kg


Size 210 h x 145 w x 46 d mm (8.25 x 5.75 x 1.75 inches)
Weight <500 g (1.1 lb)
Enclosure material ABS
Sensor connection Two or three wire connection to sensor via screened cable
Operating voltage 13-28 V dc
Input type 4-20 mA sink or source (selectable)
Panel indication Power Healthy         Green LED
System fault              Amber LED
Alarm 1 & Alarm 2   Red LEDs
Fault current <3 mA and >23.5 mA (overrange fault)
Operating temperature -20°C to +70°C (-4°F to +158°F)
Storage -25°C to +65°C (-13°F to +149°F)
Humidity 0-99% RH, non-condensing
Trip point hysteresis Alarm hysteresis set at approximately 0.5 mA
Fault hysteresis set at approximately 0.2 mA
Response time Time to alarm <1 second
Connections Terminals accept cables of cross sectional area 0.5 to 2.5 mm2
Relay outputs Single pole change-over for use with dc signals
The relay contacts are rated 1A at 30 V dc
Standards EMC EN50270
Ingree protection IP20

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