EF-404 1-4 Channel Gas Alarm


Key Features

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  • Versatile System Configuration
  • Flammable, Oxygen and Toxic Gases
  • 1 to 4 sensors
  • Plug in sensor channel cards
  • Two alarm stages


The EF 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.


Each gas sensor continuously monitors the atmosphere, reporting any hazardous conditions to the control unit, for display by the alpha numeric screen indicating the reporting sensor, gas type, concentration and alarm status. Alarm levels that are exceeded will automatically activate a variety of signal outputs including analogue/digital data and user selectable relays.

The Gas Net system operates on a single 4-core cable network and has the capacity to monitor up to 32 addressable sensors of various gas types. Larger systems offering unlimited sensors can be achieved using multiple Gas Nets housed in a 19” rack based system. The Gas Net is supplied ready to use with pre-calibrated gas sensors and provides for additional sensors that can be easily added to any point of the network. When local indication/alarm functions are required, any number of Snoop remote alarm panels may be connected, offering repeat functions of the main panel.

Additional Features

  • Selectable alarm relays
  • Analogue 4-20mA output
  • Delay to alarm option

Tech Specs

Sensor points

1 ~ 4


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 and specials

Power Consumption

12 watts – full alarm


Power – Green L.E.D

Mains Fail – power indicator change green to amber

Alarms – Red L.E.D.s

Fault – Amber L.E.D

Digital Display – 31/2 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


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 – resetable S.P.C.O

All contacts 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


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 backup battery

Field terminals – 2.5mm quick release

System/lamp test

Remote Accept/Reset

Alarm isolate during service – inhibit

Part Codes

410-001404 Control Unit, 1~4 Way
410-011404 Control Unit, 1~4 Way – 50V DC Version
410-002404 Flam Alarm Card, Flammable Gas, Plug-in
410-003404 Toxic Alarm Card, Toxic/Oxygen, Plug-in
400-001404 Internal Stand-by Battery, 1Hr Standby Period
400-004404 Control Unit 19″ Rack Mount, 4U High