GDS - Model 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 ~ 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-energised, 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 - resettable 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
• System Inhibit - Alarm isolate during service

• Versatile System Configuration
• Flammable, Oxygen and Toxic Gases
• 1 to 4 sensors
• Plug in sensor channel cards
• Two alarm stages
• Selectable alarm relays
• Analogue 4-20mA output
• Delay to alarm option