Measuring Technology Of The Oxygen Content In Flue Gas Based On Zirconia Sensor

Analysis of oxygen content is very important in the field of industrial production,medicine and environmental protection. How to improve the combustion efficiency and utilize energy sources rationally has been a very important subject in industrial production. In oil, energy, chemical and many other areas, the oxygen content of the flue in boiler can directly reflect the combustion conditions. So it is important to measure the oxygen content.With analyzing ZrO2 oxygen content principle and kinds of outside and intrinsic factors affected the measurement of the oxygen content, we make a practical equation that used in online measurement of oxygen content in flue gas, and draw a conclusion that the important key to improve measure precision of oxygen content is the stable control of the sensor's work temperature. A kind of PI-Fuzzy control method is provided to control the sensor's work temperature, the experiment testified the method can remarkably improve precision and stability of sensor's working temperature control.The design based on the MSP430 mcu released the hardware work, increased the anti-jamming and stability of system, and also contained the oxygen voltage magnifying circuit, the thermocouple compensation circuit, standard current signal output circuit, communication circuit, etc. Experiment was made to test performance of the circuit, and the circuit fulfilled the request of oxygen content measuring about precision and stability.