GDS Combi – Addressable/Direct Gas Monitoring System

  • Up to 64 addressable sensors per controller
  • Network system up to 16 controllers (1024 Sensors)
  • 1-16 direct 4~20mA sensors – 2/3 wire per controller
  • 4 core sensor network (addressable)
  • On screen text description of sensor locations
  • 3 alarm levels
  • Event – data logging – internal 99 event
  • Low cost installation
  • One man calibration utilising peak readings
  • Automatic safety check diagnostics/system surveillance
  • Eight 4 to 20 mA analogue output – option
  • Repeater panel – option
  • 64 Additional relays – option
  • Continuous data logging via PC – option
  • Programmble 4 way relay board – option
  • Will accept alternative 4-20mA sensors – typically temperature, pressure, humidity etc.

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Application

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, offices.

Operation

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 precalibrated gas sensors and provides for additional sensors that can be easily added to any point of the network.

Technial Data

Sensor points
  •  1-64 addressable – Can bus – and/or
  •  16 direct 4~20mA
  •  Combi Plus – 128 addressable
Measurements
  •  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), alarm status, system fault, line fault, sensor fault, inhibit, real time clock, event memory
  •  Red LED – global alarm, Amber LED – global fault, Amber LED-inhibit
Outputs
  •  8 user selectable zone/voting – time ON/OFF delay relays NE/ND option
  • Relay contacts – 2 D.P.C.O / 6 S.P.C.O. rated @ 5A-230v AC
  •  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 – 16 programmable with pattern/event
  •  Optional – addressable 4 way relay unit
  •  2 channel 4~20mA – assignable to any sensor
  •  RS232 data log – event log
  •  Modbus – RS485 x2
Audible Alarm
  •  Alarm/Fault – permanent mute option
Power
  •  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

Sensor Cable – Addressable Direct
  •  Main network – 4 core (2 power – 2 comms)
  •  2/3 core
  • 1.5mm2 screened
  • max length 1km
Miscellaneous
  •  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 – Coms fail, Modbus fail, MPU fail
  •  Password protection – user mode/engineers mode
  •  LCD and LED dimming
Environmental
  •  Control unit – IP52
  •  Operating temperature -10 + 50°C
Dimensions
  •  315W x 265H x 95D – Combi panel
  •  315W x 265H x 95D – Auxiliary power pack
Weight
  •  4.95Kg

System Configuration

GDS Combi addressable direct gas monitoring system

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