Originally posted by: Jonni1987
I have recently been completing an investigation into a temperature transmitter failure, of which the manufacturers I do not wish to mention. The failure was found during a calibration of the transmitter where the output had "drifted". I understand that these things happen, and I have had it in the past. Is there any explanation as to why transmitters in general drift? I know it could be a mixture of mechanical issues i.e. diaphragm stress' and electronic issues i.e. resistance changes. However, I was wondering if there was any definite answer for certain transmitters?
If you are saying that the device has drifted permanently then that could be due to faulty components inside the transmitter. All temperature transmitters use temperature compensation components and failure of one of these would cause permanent drift requiring re-calibration. All components inside the transmitter are affected by variations in temperature and it is the compensating components and circuit design that stops these variations from causing larger swings in accuracy.
Have you checked that the transmitter is operating within its maximum operating temperature?