GDS 404
1-4 Channel Gas Alarm

The GDS 404 has been designed with features that provide an effective response to the detection of gas hazards in a wide range of environments, from commercial premises through to heavy industrial applications requiring hazardous area sensing. Typical monitor locations are public buildings, boiler plant rooms, swimming pools, water treatment works, H&V control systems, manufacturing and processing plants.


Sensor points
1-64 addressable ­– CANbus – and/or
16 direct 4~20mA
Combustible Gas – L.E.L., % vol
Toxic Gas – ppm, % vol
Oxygen – % vol – Depletion/Enrichment
Refrigerant – ppm
Any 4~20mA transmitter
Indicators – control unit concentration
Dot matrix LCD 4 line 40 character – indicating sensor
location, gas type, (rising or falling alarms), alarm status,
system fault, sensor line fault, sensor fault, inhibit,
real time clock, event memory
Red LED – global alarm, Amber LED – global fault,
Amber LED-inhibit

8 user selectable zone/voting – with NE/ND option
and delay to de-energise
Relay contacts – 2 D.P.C.O / 6 S.P.C.O. rated
@ 5A-230v AC
Factory set 1 common low alarm D.P.C.O or group 1
1 common high alarm D.P.C.O or group 2
1 common overange S.P.C.O or group 3
1 common fault alarm S.P.C.O or group 4
4 user selectable S.P.C.O groups 5 to 8
General alarm relay – resetable S.P.C.O. for sounders etc.
Optional – 2 x 32 relays – first 16 programmable
with pattern/event with NE/ND options and delay to
de-energise – 48 are single event
Optional – remote addressable 4 way relay unit
RS232 data log – event log
Modbus – RS485 x2
Combi Soft: full data logging /management tool – option.
Individual sensor logging – intervals 1-60 mins storage
readings 2880
Audible alarm
Alarm/Fault – permanent mute option
230/115v AC or 24v DC ±15%
Control unit 7.5w quiescent 17w full alarm
Sensor – 1.25w
Internal power supply: 20 sensors max. 21+ sensors –
11A/24vDC Auxiliary Power Pack required C1541/C1293

Click to View PDF Document

Combi Combi Soft