EF-Combi Addressable/Direct Gas Monitoring System


Key Features

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  • 1 to 64 addressable sensors
  • 1-16 direct 4~20mA sensors – 2/3 wire
  • Either or both types of sensors
  • Single 4 core sensor network (addressable)
  • Parameter set up via pc or front panel


Combi has been designed to operate in the full range of environments from commercial premises through to heavy industrial applications which may require hazardous area sensing. Typical monitor locations are – public buildings, car parks, tunnels, breweries, boiler plant rooms, water treatment works, H&V control, manufacturing, process plants, horticulture, hotels, and offices.


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 Combi system operates on a 4-core (addressable) or 2/3 core (direct) cable network and has the capacity to monitor up to 64 addressable and 16 direct sensors of various gas types. Larger systems offering unlimited sensors can be achieved using multiple combi units housed in a 19” rack based system. The Combi 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.

Optional software (Combi Soft) allows full data logging facilities with system management providing real time views showing sensor locations, alarms status and actual gas values.

Additional Features

  • On screen text description of sensor locations
  • 3 alarm levels with time to alarm option
  • Event – data logging – internal 99 event
  • Low cost installation
  • Repeater panel – option
  • 64 Additional relays – option
  • Addressable relay board – option
  • One man calibration utilising peak readings
  • Continuous data logging via pc – option (combi soft)
  • Automatic safety check diagnostics/system surveillance
  • Combi Plus, up to 128 addressable sensors per standard panel size
  • System management via remote access

Tech Specs

Sensor points

1-64 addressable – Can bus – and/or

16 direct 4~20mA

Combi Plus – 128 addressable


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, concentration (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

1 common high alarm D.P.C.O

1 common overange S.P.C.O

1 common fault alarm S.P.C.O

4 user selectable S.P.C.O

General alarm relay – resetable S.P.C.O. – for sounders etc.

Optional – 64 relays – first 16 programmable with pattern/event with NE/ND options and delay to de-energise

Optional – remote addressable 4 way relay unit

2 channel 4~20mA – assignable to any sensor

RS232 data log – event log

Modbus – RS485 x2

Combi Soft – full data logging and management tool – option

Audible Alarm

Alarm/Fault – permanent mute option

Alarm Settings

230/115v AC or 24v DC

Control unit 7.5w quiescent 17w full alarm

Sensor – 2.5w

Internal power supply

– 20 sensors max

– 21+ sensors – PS10 Power Pack required

Sensor Cable – Addressable

Main network – 4 core (2 power – 2 comms)


2/3 core


Enclosure cable entry – bottom, rear, top

Remote reset/mute

Front panel button – key lock

Repeater panel

16 way 4~20mA catalytic converter panel

LED indication – Comms fail, Modbus fail, MPU fail

Password protection – user mode/engineers mode

LCD and LED dimming


Control unit – IP52

Operating temperature -10 + 50˚C


315W x 265H x 95D – Combi panel

315W x 265H x 95D – Auxiliary power pack



Part Codes

160-100Combi Control Unit – 64 + 16 sensors, Standard Metal Enclosure IP52
160-150Combi Control Unit – 64 + 16 sensors, Metal Enclosure IP66 Rated   400 x 400 x 200mm
168-553Combi Control Unit 19″ 3U Chassis Tray Front Panel & Label
160-200Combi Repeater Panel (standard enclosure)
160-201Combi Repeater Panel (19″ 3U rack mounting)
007-613Combi Additional Relay Panel – 32 way in separate enclosure
160-205CAN Relay Module in 20J JB, 4 x Relay Module in 20J
200-003Combi Auxiliary Power Pack 11A@24v DC required for use with 21 or more sensors
165-001Combi Control Unit – 19″ 3U rack 1 – 64, One Controller
165-002Combi Control Unit – 19″ 6U rack 1 – 128, Two Controllers
165-003Combi Control Unit – 19″ 9U rack 1 – 192, Three Controllers
165-004Combi Control Unit – 19″ 12U rack 1 – 256, Four Controllers