GDS 404 – 1-4 Channel Gas Alarm

Application

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.

Technical Data

Sensor points	1 ~ 4
Measurements	Combustible Gas – L.E.L., % vol, ppm Toxic Gas – ppm, % vol Oxygen – % vol Depletion/Enrichment Any 4~20mA input signal
Power supply	230/115v AC or 24v DC
Power Consumption	12 watts – full alarm
Indicators	Power – Green L.E.D. Mains Fail – power indicator change green to amber Alarms – Red L.E.D.s Fault – Amber L.E.D.s Digital Display – 3 1/2 Digit – gas readout Sensor channel selection indicator – Amber L.E.D. System test – Alarm L.E.D.s flashing Alarm Relay Inhibit – Fault L.E.D. on
Outputs	High Alarm Relay – Common D.P.C.O Normally energised or de-energissed, latched or unlatched Low Alarm Relay – common D.P.C.O Normally energised or de-energised, latched or unlatched Fault Alarm Relay – Common S.P.C.O Normally energised or de-energised Channel Relays – 1 per channel high or low selectable S.P.C.O Normally energised or de-energised, latched or unlatched General Alarm Relay – resetable S.P.C.O All contracts rated 5A-230vAC Analogue 4~20mA output per channel Output 24vDC @ 100mA max – auxiliary equipment (non inductive)
Audible Alarm	Permanent mute option Lo, Hi, Fault alarms
Alarm Settings	Digital Setting (fully adjustable between zero and fullscale) Delay to alarm T1 – 10 seconds, T2 – 30 seconds, T1 + T2 – 10 minutes
Sensor inputs	Bridge type 3 wire mV input 4~20mA (electrochemical/infrared)
Sensor cable	3 core 1.5mm2 screened <1.5km
Miscellaneous	EMC approvals EN50270 Marine EN60945 Enclosure – cable entry – bottom/rear Operating temperature -10 to +50?C Relative Humidity 0 – 90% Protection IP52 – option IP65 Dimensions 310W x 265H x 75Dmm Weight 3.6kg Optional battery backup Field terminals – 2.5mm quick release System/lamp test Remote Accept/Reset Alarm isolate during service – inhibit