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Crowcon Gasmaster Control Panel


Gasmaster is the flexible and simple-to-use solution wherever you need a self-contained control panel to monitor gas or fire hazards.

It combines extensive features and outstanding performance to suit all applications. Gasmaster provides the information you need at a glance via the comprehensive display, and all adjustments can be performed using the buttons on the front panel. Gasmaster can operate 'stand-alone' or interface with any alarm devices and control systems using a selection of outputs.

In short, Gasmaster is the flexible control panel you can trust.

Gasmaster Models

  Gasmaster 1 for one gas detector or fire zone
  Gasmaster 4 for up to four gas detectors or fire zones
  Gasmaster FP certified Flameproof control system for up to four gas detectors or fire zones. For use in Zone 1 or Zone 2 hazardous areas.

Features and Benefits

  Large LCD display: provides simultaneous display of all channels and multi-lingual alarm/fault messages.
  Modbus communications: enables fast transfer of all data to SCADA/DCS systems via a two-wire link.
  Event log function: allows previous alarms and faults to be checked.
  Monitored relay coils: enhance the integrity of the product.
  Configurable relays: relays can be set to suit any site operating requirements.
  ‘Calibration Due’ warning: Gasmaster informs when a service is due.
  Full push-button operation: all operation, calibration and test functions are performed using the key pad; to save you time!

Simple and convenient

Gasmaster has been designed for easy operation. All gas levels are displayed simultaneously to enable full system status checks at a glance.

All functions from day-to-day operation to re-calibration can be carried out from the front panel, so routine testing can be performed in a moment.

Gasmaster PC software enables re-configuration and event log upload in an instant.

Installation and maintenance is also extremely simple. Ample space is provided for cable glands and termination of wiring. Gasmaster warns when calibration is due, and all inputs and outputs can be quickly tested using a simple button press.


Safe and reliable

There are two levels of alarm per channel as well as common alarm and fault relays, which can be configured to suit site requirements. An integral 85dB multi-tone sounder is fitted as standard.

Relays can operate in ‘fail-safe’ mode, and all coils are actively monitored so Gasmaster can warn if a relay fails.

Battery back-up is provided as standard to ensure continued protection even if the power fails. Alarms and faults are recorded in an ‘event log’ which can be accessed regularly to assess risks on site.

Flexible input and output options

Gasmaster can monitor and control virtually any combination of gas or fire detectors, and offers an array of outputs as standard to enable simple integration with any control equipment with minimum wiring.

Gasmaster provides relays, drives for audible/visual alarms, 4-20mA or 1-5V outputs and RS-485 Modbus communications for comprehensive monitoring and control.

For convenience, Gasmaster has a remote inhibit and remote reset facility to enable control from any point on your site.

Level 1 alarms can be set to operate ‘silently’ so that ventilation fans can be controlled without raising alarms.

Adaptable to your needs

The LCD display can be set to read in many languages, and provides detailed descriptions of alarms and detector locations as well as system status.

Ordering Information


CE and CSA Approved Gasmaster

C01906 Gasmaster 1 single channel unit
C01931 Gasmaster 1 with Accessory Enclosure connector (required if an Accessory Enclosure is to be used)
C01928 Gasmaster 1 with Communications Port (required for Gasmaster PC connection and event log upload)
C01933 Gasmaster 1 with Accessory Enclosure connector and Communications Port
C01889 Gasmaster 4 one to four channel unit
C01930 Gasmaster 4 with Accessory Enclosure connector (required if an Accessory Enclosure is to be used)
C01927 Gasmaster 4 with Communications Port (required for Gasmaster PC connection and event log upload)
C01934 Gasmaster 4 with Accessory Enclosure connector and Communications Port

MED (Marine Equipment Directive) approved Gasmaster. Approved for use with Xgard IR HC gas detectors and Xgard Type 1 and 2 oxygen detectors only

C011058 Gasmaster 1 single channel unit. Marine approved.
C011060 Gasmaster 1 with Communications Port. Marine approved.
C011057 Gasmaster 4 one to four channel unit. Marine approved.
C011059 Gasmaster 4 with Communications Port. Marine approved.

Gasmaster Accessories

Accessory Enclosure for connection of mV bridge flammable gas detectors such as Xgard Type 3 and Type 4.
Use where detectors are to be installed in inaccessible locations.
Supplied with 0.75 metre lead and a connector loom for Gasmaster.

C01919 For one detector
C01920 For two detectors
C01921 For three detectors
C01922 For four detectors
E07636 Accessory Enclosure connector (for fitment to Gasmaster systems ordered without this already fitted).
C01929 Gasmaster PC communications kit. Includes software, RS-485/232 coverter and leads. Required for event-log upload
E07635 Communications port (for fitment for the Gasmaster systems ordered without this already fitted).
E07637 Engineers comms. lead (connects to display PCB). RS-485-232 converter and Gasmaster PC software not included.
C01954 Auxilliary power unit to provide an auxilliary 24V DC supply and extended back-up. Includes 2 x 12V 7Ah batteries. 230V ac supply.
C011034 Auxilliary power unit to provide an auxilliary 24V DC supply and extended back-up. Includes 2 x 12V 7Ah batteries. 110V ac supply.
M01861/2 Steel brackets for panel-mounting Gasmaster (pair of brackets supplied).
M01255 Gasmaster IP56 ABS enclosure - 400 x 400 x 200 mm, with window.
S011894 Gasmaster IP66 (NEMA 4X) ABS enclosure - 400 x 400 x 200 mm, no window.

Gasmaster Spares

E01875 Battery - 1.2Ah, 2 required for a Gasmaster system
E07534 Battery fuse assembly
M07624 Installation, operating and maintenance manual
M05897 Service card (for inside of front cover, price per 10)
S012016 Display PCB. (Gasmaster serial number required for programming)
S012038/2 Gasmaster 4 terminal PCB - standard and marine versions (no jumper links supplied)
S012039/2 Gasmaster 1 terminal PCB. Part no longer available: use Gasmaster 4 terminal PCB: S012038/2Gasmaster 1 terminal PCB. Part no longer available: use Gasmaster 4 terminal PCB: S012038/2
E07109 Insulated jumper links (price per 10)
S011746 Power supply assembly (complete with wiring looms)
S011726 DC cable assembly
S011724 Mains cable assembly (internal)
S011722 Earth wire assembly
S011723 Sounder assembly (complete with wiring loom)
M04683 Sounder seal
M05891 Gasmaster 4 display label (blue label with buttons)
M05906 Gasmaster 1 and Solo display labelGasmaster 1 and Solo display label
M05892 Domed Crowcon label (for all Gasmaster models)
M05893 Domed Gasmaster label (for Gasmaster 1 and Gasmaster 4)
M05907 Domed Gasmaster Solo label
S011750 Front cover assembly for Gasmaster 1 (complete with label, sounder and seal)
S011555 Front cover assembly for Gasmaster 4 (complete with label, sounder and seal)
S011757 Front cover assembly for Gasmaster Solo (complete with labels, sounder and seals)
M04837 Chassis plate: use 2-part chassis (M040117/M040118)
S011753/2 Sensor amplifier PCB for Accessory Enclosure
E07102 4-way connector for detector cable termination
S02000 Display ribbon cable (50-way) with 50-way IDC connector each end
S012207 Input module for 4-20mA and Fire detectors
S012208 Input module for mV-type detectors
S013046 Gasmaster 1 terminal PCB - no input modules supplied
S013047 Gasmaster 4 terminal PCB - no input modules supplied
E07109 Insulated jumper links (price per 10)
S012016 Display PCB (all models). (Gasmaster serial number required for programming)
S02000 Display ribbon cable (50-way) with 50-way IDC connector each end
E01875 Battery - 1.2Ah, 2 required for a Gasmaster system
E07534 Battery fuse assembly
S012304 Power supply assembly (complete with wiring looms)
S011726 DC cable assembly
S012206 Mains cable assembly (internal)
S011722 Earth wire assembly
S012303 Front cover assembly for Gasmaster 1 (complete with label, sounder and seal)
S012302 Front cover assembly for Gasmaster 4 (complete with label, sounder and seal)
S012205 Sounder assembly (complete with wiring loom)
M04683 Sounder seal
M050068 Gasmaster 1 display label (orange label with buttons)
M050067 Gasmaster 4 display label (orange label with buttons)
M040119 Front panel seal (self-adhesive)
M040118 Display chassis
M040117 Battery chassis
M070010 Installation, operating and maintenance manual (English)
M05897 Service card (for inside of front cover, price per 10)
M040122 Nylon bushes for base casting IP integrity
E07100 2-way connector for 24V supply cable termination
E07101 3-way connector for mains cable termination
E071130 4-way connector for detector cable termination

Gasmaster Accessories

C01929 Gasmaster PC communications kit. Includes software, RS-485/232 coverter and leads. Required for event-log upload
E07635 Communications port (for fitment for the Gasmaster systems ordered without this already fitted).
E07637 Engineers comms. lead (connects to display PCB). RS-485-232 converter and Gasmaster PC software not included.
C01954 Auxilliary power unit to provide an auxilliary 24V DC supply and extended back-up. Includes 2 x 12V 7Ah batteries. 230V ac supply.
C011034 Auxilliary power unit to provide an auxilliary 24V DC supply and extended back-up. Includes 2 x 12V 7Ah batteries. 110V ac supply.
M01861/2 Steel brackets for panel-mounting Gasmaster (pair of brackets supplied).




Data Sheet
User Manual

Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product.

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Keison International Ltd. trading as:
Keison Products, VoIPon Solutions & 4Gon
keison VoIPon Solutions 4Gon