Zirconia oxygen analyzer is mainly used to measure the oxygen concentration in flue gas during combustion, and is also suitable for measuring the oxygen concentration of non combustible gases.

The electrochemical cell with constant temperature inside the sensor generates a millivolt potential, which directly reflects the concentration of oxygen in the flue gas. Applying this analyzer to combustion monitoring and control will help achieve full combustion, reduce emissions of CO, SOx, and NOx, and contribute to preventing global warming and air pollution. At the same time, zirconia oxygen analyzer can also be used for atmosphere control and precise control of combustion efficiency.

Improper use of zirconia oxygen analyzer, aging of components can lead to instrument malfunctions, inaccurate detection, and other issues. So, what specific issues can cause instrument malfunctions?

1. Zirconia probe aging.When most probes age, the internal resistance will be greater than 1k Ω, so the degree of probe aging can be determined by measuring the internal resistance of the probe. In general, under reasonable installation point selection and moderate to harsh smoke conditions, the probe will only show significant aging after one year of use. However, if the installation temperature is too high or the sulfur dioxide content in the smoke is too high, it will accelerate the aging of the probe and shorten its lifespan.

2. Oxygen level fluctuates.The oxygen operation curve is a fluctuating line with spikes. Burrs and fluctuations are short cycle noise and long cycle noise, respectively, caused by furnace pressure fluctuations and air coal ratio fluctuations. Therefore, the size of burrs and fluctuations depends on the quality of the furnace, not caused by the probe itself. Normal burrs are about ± 0.4%. If the burr is close to ± 1%, it is a small jump, and if it is greater than ± 1%, it is a large jump. Probe aging is one of the reasons for jumping.

3. The oxygen level display is abnormal.There are many causes of abnormal oxygen display, mainly including aging or damage of zirconia components, broken heating furnace wires, broken thermocouples, and the need to replace corresponding instrument components or probes; In addition, poor contact or disconnection of the connecting wires can also cause abnormal oxygen display, requiring reconnection or replacement of the wires.

4. The oxygen level display is on the high side.There are many reasons that can cause high oxygen content display, mainly including air leakage in the furnace wall, flange leakage during installation, loose standard gas inlet nut of the probe, loose connection between the internal pipe components and external pipes of the probe, connection between the internal pipe and zirconia components, and aging of zirconia. The discrimination method is: when the calibration is normal with standard gas, but the oxygen level is significantly high during operation, it can be judged as gas leakage, that is, air leakage in the furnace wall, flange leakage during installation, loose standard gas inlet nut of the probe, or loose connection between the internal pipe components of the probe and the external pipe, or between the internal pipe and the zirconia component.

5. Block the dust.When the probe is installed at the constriction where the smoke velocity is too high, not only is the probe prone to wear, but it is also prone to clogging. When blocking dust, the oxygen content changes very slowly.

6. The temperature is abnormal.There are many reasons for abnormal temperature, mainly including thermocouple breakage, heating furnace wire breakage, power supply problems, over temperature protection circuit action, heating drive signal failure, temperature control circuit failure, etc.