Zirconia, no heating
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Our company has newly installed a SERVOMEX 2700series zirconia oxygen analyzer. After power was supplied, the instrument kept showing 39°C; the zirconia element did not heat up, and the instrument could not function properly； Also, the transmission range I set is 0-5% O2; since the zirconium probe is not heated, the instrument displays 20% O2, but the DCS screen shows 0%. Does anyone know what’s going on? Please give some advice. Thank you!
Check whether the wiring is correct, and then look at the settings. Try changing the transmission range to 0~25%
What is being measured is the oxygen content in the flue gas; the pumping pressure is 50 KPa, and the wiring is fine.
I’ve never used this thing before; I’m learning about it. Is the temperature setting built-in, or does it need to be connected separately?
Check whether the wiring for heating power supply is functioning properly
It’s a new purchase, so be sure to read the instructions carefully; they contain the relevant settings that need to be configured properly. If the temperature doesn’t rise, it might be that the heating element is damaged – you can check its resistance
The engineer from the manufacturer handled the connection; he said that the sensor head must first be heated to 200°C before the zirconium head can be heated, and this process usually takes about 1.5 hours. More than a day has passed now yet it still hasn’t been heated. The engineer from the manufacturer came by, but he wasn’t on site. What is the value of the heating resistance?
Check if there’s a problem with the pickling tank or the heater; to measure the oxygen content, it’s generally necessary to heat it to over 700 degrees
There is a problem with the electric heating circuit; you can measure the resistance between the wiring terminals of the electric heater.
This post was last edited by Yunmu on 2019-2-11 at 14:19; the electric furnace wire and wiring were checked, with the instrument reading 60–80 ohms