GDS 404 – 1-4 Channel Gas Alarm

  • Versatile System Configuration
  • Flammable, Oxygen, Refrigerant and Toxic Gases
  • 1 to 4 sensors (mV signal or 4~20 mA inputs)
  • Plug in sensor channels
  • Two alarm stages
  • Selectable alarm relays per channel
  • Analogue 4-20mA output per channel
  • Delay to alarm – option
  • Internal Battery Backup – option

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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

 

Sensors

GDS 404 1-4 channel gas alarm

Fixed Terminals

GDS 404 1-4 channel gas alarm

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