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GS300M – 3 Channel Gas Detection Controller

The GS300M is a 230V three channel and sensor wall or panel mounted gas detection controller. Please note that the GS300Mc is a more advanced controller available for the same price.


Quantity discount

Quantity 1-4 5-9 10-19 20+
Price £438.94 £416.99 £395.05 £373.10



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Firstly, the GS300M Gas Detector can be set up to suit requirements using DIP switches:

  • Number of sensors from 1 to 3
  • Gas type (explosive or toxic)
  • Positive Safety Option (on or off)
  • Main alarm relay action (latching or auto-reset)

Two LED’s show either battery or a sensor wiring faults. Finally, there are two plug in terminal blocks. One for mains supply and alarm circuit wiring. The second for sensor connections. This reduces the chance of incorrect site wiring. The GS300M controller can be wall or panel mounted.

The GS300Mc version has a digital display. If you require a four sensor controller please see the BX444Mc Gas Controller.


Product Details

  • Three channel protection
  • 230VAC supply
  • Wall or panel mounted
  • Positive safety option
  • Detection of Toxic 0-300ppm / Explosive Gas(es) 0-20%LEL
  • 4-20mA signal sensor input
  • 3 alarm stages - 1st & 2nd pre-alarm and main alarm IP44 protective rating
  • CE certified and approved to EN 61010-1, EN 50270, EN 50271, EN 45544-3, EN 60079-29-1
  • 2 years guarantee - 3 years by registering at duomo.co.uk


Onsite Diagnostics

If you require onsite diagnostics or technical assistance with any of our products please contact us

  • This field is for validation purposes and should be left unchanged.


We recommend Duomo Gas Detection products are serviced at least annually to ensure efficacy and extend sensor life. Our qualified team of engineers are available Nationwide.



  • GS300M Datasheet

    1.76 MB | pdf

  • GS300M Wiring Diagram

    93.66 KB | pdf


Support & Service

If you require technical assistance or an annual service on this product please contact us and we will be happy to help. Our qualified team of engineers are available Nationwide.

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