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SG500 – Methane or LPG Gas Sensor

The SG500 is a Methane (or LPG) gas sensor. It uses industry standard 4-20mA output and is compatible with the complete range of Duomo UK gas controllers.

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Quantity 1 - 4 5 - 9 10 - 19 20+
Price £60.56 £57.53 £54.50 £51.48



When the SG500 senses the presence of gas it sends a 4-20mA signal to the detector. The controller then operates a pre-alarm relay which activates sounders or beacons. If the gas levels continue to rise then the main alarm relay breaks the electrical supply to a safety shut off valve. This is fixed at 20% LEL of natural gas.

For a more advanced Methane or LPG gas sensor check out the SGM595 Gas Sensor.


Product Details

  • Detects either Natural Gas or LPG
  • 4-20mA signal
  • Nemoto catalytic sensor technology
  • Low cost
  • Sensor active indicator
  • IP30 enclosure
  • Compatible with BX150, BX444M, GS300M, GS300Mc GS100M and BX316
  • Comes with 2 year warranty (applicable for a 12 month extension)


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.



  • Datasheet

    99.67 KB | pdf

  • SG500 Wiring Diagram

    84.83 KB | pdf



Can the SG500 Methane or LPG Gas Sensor be used for other types of gas?

The SG500 is specifically designed to monitor Methane or LPG. For monitoring other types of gas, it would be best to check out other specific detectors.

Where should I install the SG500?

The SG500 natural gas sensor should be mounted in accordance with certain considerations. Do not position next to burners, heaters or ovens where temperatures above the room ambient may be experienced. It is, if possible, better to mount the sensors on the opposite wall. This is, of course, dependant on the size of the protected area.

Natural gas is lighter than air and will therefore rise, meaning the SG500 sensor should be mounted 300mm from the ceiling of the protected area.

LPG is heavier than air and will therefore drop, meaning the SG500 sensor should be mounted 300mm from the floor of the protected area.


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.

Duomo (UK) Ltd

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