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Product information

  • Product: Crowcon
  • Category: Control Panels
  • Product URL: Gasmaster


Crowcon's NEW and ENHANCED Gasmaster Control Panel has a modular design meaning users only need purchase the required number of input modules. It can easily be extended by adding more modules at a later date.

The Crowcon Gasmaster is a compact, versatile and powerful gas detection control panel that combines simple operation with an extensive array of input and output functions.

Crowcon Gasmaster provides all the information you need about your gas and fire detectors at a glance. The large multi-lingual display shows gas levels from all detectors simultaneously and enables system adjustment and testing using buttons on the front panel. Crowcon Gasmaster can operate ‘stand-alone’ or interface with any alarm devices and control systems using a selection of outputs.

Large display

  • All gas levels are displayed simultaneously - enables full systems status check at a glance
  • Alarm messages can be customised to indicate the name or location of any detector in alarm
  • The LCD can be set to display in many languages

User friendly

  • Menu system is intuitive and easy to use - enables configuration changes to be made easily
  • All functions, from day-to-day operation to re-calibration, can be carried out from the front panel - routine testing can be performed rapidly
  • Event log feature - enables system fault and alarm history to be viewed

Versatile input and output features

  • Provides analogue, relay and Modbus outputs - facilitating communication around the site
  • Flexibility - Gasmaster can monitor up to four detectors in virtually any combination of gas detectors, fire zones or Environmental Sampling Unit*. Software enables re-configuration and event log upload in an instant**
  • Two levels of independent alarm per channel - can be configured to suit site requirements
  • Remote inhibit and re-set facilities - enables control from any point on your site
  • Compatible with a 4-20mA or mV pellistor-type gas detector - mV pellistor detectors reduce system purchase and maintenance costs

Modular design

  • You only need to purchase the required number of input modules - 1,2 and 3-channel systems can be extended later by adding additional modules***


Size Gasmaster 1 & Gasmaster 4
288 x 278 x 110mm (11.3 x 10.9 x 4.3 inches)
Weight Gasmaster 1 & Gasmaster 4
4.5kg (10lbs)
Environment Operating Temperature
Gasmaster 1 & Gasmaster 4
-10°C to +50°C (14°F to +122°F)
Ingress Protection
Gasmaster 1 & Gasmaster 4
Approvals Gasmaster 1 & Gasmaster 4
EMC: EN50270, EN60945, FCC Part 15, ICES002
ATEX: EN60079-25:201
Enclosure material Gasmaster 1 & Gasmaster 4
Back-box: cast aluminium
Front cover: ABS (flame retardant)
Power Gasmaster 1 & Gasmaster 4
100-240Vac 50-60Hz or 20-30Vdc, 60W max
Battery back-up Gasmaster 1 & Gasmaster 4
1.2Ah batteries fitted internally
Communications port Gasmaster 1 & Gasmaster 4
Optional port for PC configuration and event log upload
Event logging Gasmaster 1 & Gasmaster 4
Time-stamped log of up to 300 alarms, fault or system intervention activities
Panel indication Gasmaster 1 & Gasmaster 4
LCD back-lit display shows gas level (in ppb, ppm, % volume or % LEL units), and scrolling alpha-numeric status indication.
LED’s for Alarm, Fault, Power and Warning. Integral 85dB sounder (at 10cm)
Functional safety Gasmaster 1 & Gasmaster 4
Validated to IEC61508
Inputs Gas
Gasmaster 1
One 2 or 3 wire 4-20mA gas detector (sink or source) or mV pellistor flammable gas detector
Gasmaster 4
One to four 2 or 3 wire 4-20mA gas detectors (sink or source) or mV pellistor flammable gas detectors
Gasmaster 1
One loop of up to 20 conventional smoke/heat detectors or manual call points, or one flame detector (4-20mA or digital contact signal)
Gasmaster 4
One to four loops of up to 20 conventional smoke/heat detectors or manual call points, or one to four flame detectors
Gasmaster 1 & Gasmaster 4
For use with one Crowcon ESU fan
Remote inhibit/retest
Gasmaster 1 & Gasmaster 4
Via normally open contact
Outputs Relays DPCO contacts rated 250Vac 8A
Gasmaster 1
Low alarm. High alarm. Fault. Alarm relays can be set for rising or falling alarms. Hysteresis can be adjusted on low alarms
Gasmaster 4
Low alarm and high alarm per channel plus common low, high and fault. Alarm relays can be set for rising or falling alarms. Hysteresis can be adjusted on low alarms
A/V alarm drive
Gasmaster 1 & Gasmaster 4
12Vdc or 24Vdc 650mA max. drive. Suitable for +ve or -ve switched alarms
Gasmaster 1
4-20mA (current source, max. loop resistance 700?) or 1-5Vdc (min. load 50k?)
Gasmaster 4
4-20mA for each channel (current source, max. loop resistance 700?) or 1-5Vdc (min. load 50k?)
Serial Link
Gasmaster 1 & Gasmaster 4
RS-485 Modbus RTU for monitoring and control via DCS/SCADA/PLC systems


Certificate Datasheet Manual
SIL Declaration Gasmaster III Gasmaster – European English Gasmaster III Manual – English (Issue 2 Oct 14)
Gasmaster Accessory Enclosure Instructions (Issue 4 Jan 15)
Gasmaster III Modbus Instructions (Issue 2 Jan 15)