GAS Gasmaster, Installation, Operation And Maintenance Manual

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Gasmaster 1 Gasmaster 4
Size 288h x 278w x 110d (mm) 288h x 278w x 110d (mm)
Weight 4.5 kg 4.5 kg
Enclosure material Back-box: cast aluminium Front cover: fire-retardant
ABS plastic.
Back-box: cast aluminium
Front cover: fire-retardant ABS plastic.
Ingress protection
IP65 IP65
Power
100-240 V ac 50-60 Hz 1.3 A or 20-30 V dc, 60 W max. 100-240 V ac 50-60 Hz 1.3 A or
20-30 V dc, 60 W max.
Battery back-up 1.2 Ah batteries fitted internally 1.2 Ah batteries fitted internally
Operating temperature -10ºC to + 50ºC (14 to 122ºF). -10ºC to + 50ºC (14 to 122ºF).
Humidity 0 to 95% RH non-condensing 0 to 95% RH non-condensing
Input: Gas One 2 or 3 wire 4-20 mA gas detector (sink or source)
or mV bridge pellistor flammable gas detector.
Maximum detector current: 500 mA
One to four 2 or 3 wire 4-20 mA gas detectors (sink
or source) or mV bridge pellistor flammable gas
detectors. Maximum detector current: 500 mA
Fire 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).
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).
Environmental
Sampling Unit control
For use with one Gas Alarm Systems ESU fan (ie
‘sampling device’ changes to ‘fan’).
For use with one to four Gas Alarm Systems ESU fans.
Remote inhibit Via normally open contact. Via normally open contact.
Remote reset Via normally open contact. Via normally open contact.
Outputs: Relays Low alarm, High alarm, Fault. DPCO contacts rated
at 250 V ac, 30 V dc 8 A (non-inductive load), 5 A
(inductive load).
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).
Audible/visual alarm drive 12 V or 24 V dc 650 mA maximum drive 12 V or 24 V dc 650 mA maximum drive
Analogue 4-20 mA (current source, max. loop resistance 700 Ω)
or 1-5 V dc (min. load 50 KΩ).
4-20 mA for each channel (current source, max. loop
resistance 700 Ω) or 1-5 V dc (min. load 50 KΩ).
Digital communications RS-485 Modbus RTU
9600 Baud
8 Data bits
No parity
2 Stop bits
RS-485 Modbus TRU
9600 Baud
8 Data bits
No parity
2 Stop bits
Communications port Optional 3-way connector for PC configuration and
event log upload
Optional 3-way connector for PC configuration and
event log upload
Event logging
1
Time-stamped log of up to 300 alarm, fault or system
intervention activities.
Time-stamped log of up to 300 alarm, fault or system
intervention activities.
Panel indication
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.
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.
Approvals EN 50270 (EMC), EN 61010-1 (Low voltage directive)
ATEX EN60079-25:2010 Explosive atmospheres -
Intrinsically safe electrical systems.
EN 50270 (EMC), EN 61010-1 (Low voltage directive)
ATEX EN60079-25:2010 Explosive atmospheres -
Intrinsically safe electrical systems.
1
Event 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.
Appendix A: Specifications