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GasMaster
Appendix A: Specifications
Appendix A: Specifications
Size
Weight
Enclosure material
Ingress protection
Power
Battery back-up
Operating temperature
Humidity
Input: Gas
Fire
Environmental
Sampling Unit control
Remote inhibit
Remote reset
Outputs: Relays
Audible/visual
alarm drive
Analogue
Digital
communications
Communications port
Event logging1
Panel indication
Approvals
Gasmaster 1
288h x 278w x 110d (mm)
4.5 kg
Back-box: Painted steel
Front cover: fire-retardant ABS plastic.
IP54
100-240 V ac 50-60 Hz 1.3 A or
20-30 V dc, 60 W max.
1.2 Ah batteries fitted internally
-10ºC to + 50ºC (14 to 122ºF).
0 to 95% RH non-condensing
One 2 or 3 wire 4-20 mA gas detector (sink or source). Adaptor for mV
bridge type detectors available.
Maximum detector current 500 mA.
One loop of up to 20 conventional
smoke/heat detectors or manual call
points, or one flame detector (4-20
mA or digital contact signal).
For use with one Crowcon ESU sampling device.
Via normally open contact.
Via normally open contact.
Low alarm, High alarm, Fault.
DPCO contacts rated at
250 V ac, 30 V dc 8 A (non-inductive
load), 5 A (inductive load).
24 V dc 650 mA maximum drive (typically 2 devices max.)
4-20 mA (current source, max. loop
resistance 700 Ω) or
1-5 V dc (min. load 50 KΩ).
RS-485 Modbus RTU
9600 Baud
8 Data bits
No parity
2 Stop bits
Optional 3-way connector for PC configuration and event log upload
Time-stamped log of up to 300 alarm,
fault or system intervention activities.
LCD back-lit display shows gas level (in
ppb, ppm, % volume or % LEL units),
and scrolling alphanumeric status indication.
LEDs for Alarm, Fault, Power and
Warning status indication.
Integral 85 dB sounder.
EN 50270 (EMC), EN 61010-1 (Low
voltage directive)
CSA standards C22.2 NO.152 and
C22.2 No. 142
Gasmaster 4
288h x 278w x 110d (mm)
4.5 kg
Back-box: Painted steel
Front cover: fire-retardant ABS plastic.
IP54
100-240 V ac 50-60 Hz 1.3 A or
20-30 V dc, 60 W max.
1.2 Ah batteries fitted internally
-10ºC to + 50ºC (14 to 122ºF).
0 to 95% RH non-condensing
One to four 2 or 3 wire 4-20 mA gas
detectors (sink or source). Adaptor for
mV bridge type detectors available.
Maximum detector current 500 mA.
One to four loops of up to 20 conventional smoke/heat detectors or manual
call points, or one to four flame detectors (4-20 mA or digital contact signal).
For use with one Crowcon ESU sampling device.
Via normally open contact.
Via normally open contact.
Low alarm and High alarm per channel plus Common Low, High and
Fault.
DPCO contacts rated at 250 V ac, 30 V
dc 8 A (non-inductive load), 5 A (inductive load).
24 V dc 650 mA maximum drive (typically 2 devices max.)
4-20 mA for each channel (current
source, max. loop resistance 700 Ω)
or 1-5 V dc (min. load 50 KΩ).
RS-485 Modbus TRU
9600 Baud
8 Data bits
No parity
2 Stop bits
Optional 3-way connector for PC configuration and event log upload
Time-stamped log of up to 300 alarm,
fault or system intervention activities.
LCD back-lit display shows gas level (in
ppb, ppm, % volume or % LEL units)
for all channels, and scrolling alphanumeric status indication. LEDs for Alarm,
Fault, Power and Warning status indication
Integral 85 dB sounder.
EN 50270 (EMC), EN 61010-1 (Low
voltage directive)
CSA standards C22.2 NO.152 and
C22.2 No. 142
1Event log access requires Gasmaster PC software and communication port. Event log data is held in non-volatile memory, data
will be lost in the event of a complete system power failure.
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