Gas Detection Control Panels
Safety for Life
Safety for Life
Gas Detection Control Panels
Large display
User friendly
Versatile input and output functions
Modular design l
Up to four detectors
1-4 Channel Gas Detection Control Panel
When lives and property are at risk and you need gas detection
equipment that is totally reliable, you need Gas Alarm Systems.
For over 15 years Gas Alarm Systems has been developing and
manufacturing high quality products with a reputation for reliability
and technical innovation.
Our robust and reliable range of gas detection control panels allows
you to monitor a range of toxic and/or flammable gas detectors, flame
detectors and smoke/heat detectors, simply and easily.
GAS Gasmaster is a compact but powerful control system that combines simple operation with an extensive array of
input and output functions.
GAS Gasmaster provides all the information you need about your gas and fire detectors at a glance. The large multilingual display shows gas levels from all detectors simultaneously, and enables system adjustment and testing using
buttons on the front panel. GAS Gasmaster can operate ‘stand-alone’ or interface with any alarm devices and control
systems using a selection of outputs.
Alpha-numeric scrolling
display shows
comprehensive system
Large, clear display
shows all gas
levels simultaneously
Ultra-bright alarm indicator bar
System status LEDs
Switches for system
operation and maintenance
Large display
All gas levels are displayed simultaneously
Alarm messages can be customised to indicate the name or
location of any detector in alarm
Enables full systems status check at a glance
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
GAS Gasmaster internal arrangement
Input modules
Display support chassis
Detector connections
Display module
Battery support chassis
Optional communications port
Versatile input and output features
Provides analogue, relay and Modbus outputs
Facilitating communication around the site
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 reset facilities
Enables control from any point on your site
Compatible with 4-20mA or mV pellistor type gas detectors
mV pellistor detectors reduce system purchase and maintenance costs
Modular design
You only need to purchase the required number of input modules
* Contact Gas Alarm Systems for details 1, 2 and 3 channel systems can be extended later by adding additional
** Event Log access requires optional PC communications kit
Please see the back page for full technical specifications.
*** Gasmaster 4 only
GAS Gasmaster Specification:
Gasmaster 1
Gasmaster 4
288 x 278 x 110mm (11.3 x 10.9 x 4.3 ins)
4.5kg (10lbs)
Back-box: cast aluminium
Front cover: ABS (flame retardant)
Enclosure material
Ingress protection
100-240Vac 50-60Hz or
20-30Vdc, 60W max
1.2Ah batteries fitted internally
Battery back-up
-10OC to + 50OC (14OF to 122OF)
Operating temperature
0 to 95% RH non-condensing
One 2 or 3 wire 4-20mA gas detector (sink or source) or mV pellistor flammable gas detector
One to four 2 or 3 wire 4-20mA gas detectors (sink or source) or
mV pellistor flammable gas detectors
One loop of up to 20 conventional smoke/heat detectors or manual
call points, or one flame detector (4-20mA or digital contact signal)
One to four loops of up to 20 conventional smoke/heat detectors
or manual call points, or one to four flame detectors
For use with one Gas Alarm Systems ESU fan
For use with one to four Gas Alarm Systems ESU fans
Environmental Sampling Unit
Remote inhibit
Via normally open contact
Remote reset
Via normally open contact
Relays DPCO contacts rated
250Vac 8A. Relays can be set as
energised or de-energised, latching
or non-latchng, latching acceptable
A/V alarm drive
Serial link
Low alarm. High alarm. Fault. Alarm relays can be set for rising
or falling alarms. Hysteresis can be adjusted on low alarms
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
12Vdc or 24Vdc 650mA max. drive. Suitable for +ve or -ve switched alarms
4-20mA (current source, max. loop resistance 700Ω) or 1-5Vdc
(min. load 50kΩ )
4-20mA for each channel (current source, max. loop resistance
700Ω) or 1-5Vdc (min. load 50kΩ)
RS-485 Modbus RTU for monitoring and control via DCS/SCADA/PLC systems
Communications port
Optional port for PC configuration and event log upload
Time-stamped log of up to 300 alarms, fault or system intervention activities
Event logging*
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)
Panel indication
EMC: EN50270, EN60945, FCC Part 15, ICES002
ATEX: EN60079-25:2010
Validated to IEC61508
Functional safety
*Event log access requires a Gasmaster PC communications kit and communications port.
Compatible Devices:
Industry-standard gas detectors
Sounders and Beacons
Safe area, intrinsically safe or flameproof
Up to 20 fire/heat detectors per zone
Unit 4, Halfpenny Close,
North Yorkshire HG5 0TG.
Tel: 01423 862240
Fax: 01423 860239
Fan control for Crowcon’s Environmental
Sampling Unit
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