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When I place the ACO100 in the flue of my furnace the meter gives me very erratic readings, sometimes even a – reading. What is going on?

April 26, 2017erratic flue furnace gives going meter Reading readings

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When I place the ACO100 in the flue of my furnace the meter gives me very erratic readings, sometimes even a – reading. What is going on?

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The ACO series is not designed for the temperature or the humidity that is present in flue gases. It was designed for indoor air quality testing only. If you need to test flue gases you will need a dedicated combustion analyzer or the SGA91. The SGA91 is designed to test both flue gases and also pinpoint sources of carbon monoxide. The pump in the unit allows for very accurate testing of CO and is a great help in finding leaks.