Zero offset issue in differential pressure transmitters
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In our factory, many differential pressure transmitters experience a drift in their zero point after being used for some time. The high and low voltage measurements show 1 KP for the atmosphere; should we zero the device using a manual controller at this time? ? ? Should zeroing still be done using the transmitter itself? ? Should we just shift the range to 1-11KP directly? (Originally 0-10KP) What are the essential differences between these? ? Also, if simple pressure transmitters are cheaper, what should be the standard approach?
It is possible to zero using a hand controller or the transmitter itself. Calibration involves changing the transmitter’s zero point, while the range remains unchanged; it is not possible to calibrate it to 1–11 kPa. Furthermore, a drift of 10% indicates a quality issue with the transmitter, and the manufacturer can be contacted to resolve it.
I’ve encountered situations where adjusting the mechanical zero-point offset changed things
There’s no need to change the range; just zero it out directly
Change the hand controller. If this problem occurs frequently, it’s best to send it for calibration so as to feel more at ease
A drift of 10% – is such a gauge usable? Let’s go back to the factory