A flue gas analyser (FGA) is a portable, digital tool used by heating engineers to measure CO, oxygen (O2), differential pressure and temperature of a fossil fuelled appliance such as a fire, hot water heater and domestic boiler. The gas analysers can also be used to measure a rooms air as long as it has been calibrated in fresh air outside the room to be tested.
Your gas appliances mix air and fuel to create products of combustion. Using a flue gas analyser when installing, repairing or servicing all heating appliances it can alert you to any safely and efficiency issues. It can detect gases such as carbon monoxide which is an odourless, colourless and tasteless poisonous gas which can kill.
Readings from a FGA will vary depending on the type of appliance. It is advised to always consult manufacturers instructions.