Frontline 305

Single Point Alarm System

The Frontline 305 system is designed to monitor gas levels from a number of sample-points, targeted at situations where the positioning of conventional gas sensors may not be practical. The system is designed to monitor gas levels from a number of sample-points, targeted at situations where the positioning of conventional gas sensors may not be practical. This may be due to equipment security, cable routing, access for detector head installation/maintenance, harsh environment or a cost effective means of monitoring designated hazardous areas, typically - tunnels, marine applications, underground/high level voids, process control, landfill, multi storey car parks, brewing, horticulture, superstore multi refrigeration units.

Gas samples are sequentially extracted for a timed period by a central control unit via fixed sample lines. A high rate sample is taken by the main pump during which a reduced rate sample is passed across the sensor device. The central unit provides gas level readouts with two alarm trip points per line, providing a range of signal outputs for annunciator and control functions.

Additional Information

- 4 line alpha/numeric display
- Selectable sample line sequence
- Display of each sample line location
- Easily installed and maintained
- Full indication of all operations
- Event logging / Modbus / RS232 / RS485
- Line blockage and pump fail monitoring
- Variable sample time for optimum cycle time
- High integrity, comprehensive self check fault monitoring
- Centralised one man calibration offers minimum running costs

Optional features include split system operation, remote control panels, line blockage and blowback, LED/text indicator panel, hazardous area operation, auto flood cut off, enclosure internal gas monitoring with automatic shutdown and a sample line multiplier.

Sample Points 1-48


1-4 4~20mA input
  • Combustible gas - lel % vol
  • Toxic gas – ppm % vol
  • Oxygen – % vol
  • Depletion/enrichment
  • Refrigerant – ppm
Power Supply
  • 230/115vAC 50/60Hz
  • 300W max
LED indicators
  • System healthy
  • Main power
  • Standby power
  • High gas alarm
  • Low gas alarm
  • System, flow, sensor fail
  • Comms fail
  • Skip/hold
  • Sampling


4 line alpha/numeric indicates allfunctions and status in text. Sample line locations (user settable)
User interface  8 panel mounted push buttons – main panel and remote panel:- Reset, Scroll, Hold, Dim, enter, Down, up, Select PC – event log / data log, data to and from system controls

Relay Outputs

  • Global Low S.P.C.O.
  • Global High S.P.C.O.
  • Global Fault S.P.C.O.
  • Flow Fail S.P.C.O.
  • Power Fail S.P.C.O.
  • Cabinet Sensor S.P.C.O.
  • 32 programmable relays Additional 32 optional
  • RS232– Data Stream
  • Modbus 2 x RS485
  • Can bus – internal
  • Audible alarm all alarm conditions
  • LED/display dimming
  • User/Eng password
  • LCD backlight
  • Event logging
  • Sample line size 8mm OD 6mmID
  • Nylon, PTFE, Copper, Stainless Steel. max length 200m specials 300m+
  • Sample vent x 2-10mm
  • Tubing entry enclosure base, side option
  • Response time 15 to 45 seconds
  • Colour - powder coat ash grey BSA01
  • Wall-Mounted
  • IP 63
  • EN60945: 2002 Maritime general requirements
  • EN61010: 2001 electrical Safety - LVD
  • Size - 800mm H x 600mm W x 350mm D
  • Weight - 65kg
Technical Drawings

Technical drawings

Fixed gas phone

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Our dedicated team of Service and Project Engineers have a range of expertise and knowledge and are on hand to discuss your fixed fire and gas detection needs.  Call now on 0141 771 7749 or visit our Contact Us section on the website for more information.

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