Regarding zirconia probes
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The zirconia probes used in the past were controlled at a constant temperature; (it is generally believed that 700°C is the optimal operating temperature for zirconia probes, as at this temperature zirconia not only exhibits good electrical conductivity but also generates a stable concentration difference potential when in contact with gases at different oxygen partial pressures)； Moreover, zirconia can also provide a longer service life and improve the stability of measurements. Some time ago, a manufacturer in Shenyang recommended a zirconia probe that does not require heating; unlike traditional control methods, it operates at low temperatures and can take accurate readings at around 540 degrees. We used this probe for some time, and aside from the inability to take proper readings during shutdown or startup processes, the oxygen levels measured during normal operation were not very different from those obtained with zirconia instruments that have heating functions. (The oxygen levels at lower temperatures were measured using both the heated and unheated versions of the probe.) The problem is that it cannot be calibrated using conventional calibration methods. I wonder if anyone has used it before? What are your thoughts or experiences with this type of watch? . Under consideration
Let the professionals share some opinions; looking forward to it
A 540-degree measurement can be taken accurately; so how is it that heating isn’t required? The oxygen content is a function of the zirconium tube potential and temperature; by measuring the temperature and potential, the oxygen content can be calculated.
Now, accurate measurements can be made at 500 degrees; the oxygen content is a function of the zirconium tube potential and temperature. By determining the mathematical model relating oxygen content to temperature and potential, it is possible to calculate the oxygen content. High-temperature methods offer high measurement accuracy, but electric furnaces often break down due to the operating conditions, resulting in high maintenance costs. In low-temperature devices, no electric furnace is required to measure the temperature of the gas being analyzed, although the temperature compensation effect is slightly inferior. There is no fundamental difference between the two methods; the choice should be based on the composition of the gas being analyzed and the operating conditions. Certain gas impurities can cause poisoning of the zirconium tubes