The zirconia oxygen content analyzer cannot measure the burnt gas

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This post was last edited by Wang Tianze on 2015-7-18 at 23:54. Our company’s heterogenization units are equipped with three oxygen content analyzers of Lanlian Fuji model, using zirconia detectors. After the device was put into use, the measurement of the oxygen content during the first burn was normal; however, it has not been able to display accurate values since then, always showing 999 with an alarm. Voltage 280mv. All three units exhibit this phenomenon. But strangely, the gauge indicated an oxygen content of 20.9%, which seemed fine. A nitrogen level of 0.2% is also no problem; however, after introducing burnt gas, the millivolt value keeps increasing until it reaches 280 mv, at which point an alarm of 999 is triggered. The main components of burnt gas are over 95% nitrogen, along with a small amount of air, a small amount of sulfur dioxide, a small amount of water vapor, and other gases as well. The oxygen content in the burned gas was measured to be around 0.4–0.8% using a portable oxygen analyzer from the laboratory. Why can’t the oxygen analyzer detect it? @qugd @feng*aosa Source: The zirconia oxygen content analyzer cannot measure the burned air