Zero drift of the toxic aniline probe
Thread Content
Dear experts: I installed aniline and N**amine sensors of the semiconductor type for the customer, and they often give false alarms as well as readings outside the specified range. The manufacturer attributed this to zero-point drift; however, even after calibrating them according to the manufacturer’s instructions, the problem persisted, with false alarms continuing to occur. I hope the experts here can give me some advice. Thank you!
There must be some interfering gases; manufacturers usually provide a table showing the cross-sensitivity of the sensor to gases other than the target gas, which can be used as a reference.
Thank you! But the customers reported that even when they block the probe, false over-range alarms still occur. What’s going on?
I think it would be best to remove it and take it to a laboratory or similar place for testing, to determine whether it’s due to environmental factors or a problem with the sensor itself.
Okay, I understand. Thank you! The probe with zero-point drift has been in use for almost 2 years now. It is said online that a typical probe lasts around 2 years – is that true?
If it’s due to the sensor, would replacing the probe (sensor) in the alarm work? Is the drift caused by the sensor, or is it related to the circuitry in the alarm?
Generally speaking, the lifespan is 2-3 years, but it also depends on the usage environment； What is considered the most likely issue is a sensor failure; this can be determined by replacing the sensor and testing it.