Let’s take a look at the issue of zero drift in these pressure transmitters
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First, there is a 3051D differential pressure transmitter; the operating conditions are -100KPa to 0KPa. After it was used for some time, it was found that the pressure gauge was inaccurate. The on-site air pressure gauge check showed a zero drift of -5KPa (or 5KPa). How is such a zero point set correctly? Should it be calibrated directly, or should the range be changed back to 0-100 KPa first before zeroing? ? ?
In my opinion, having a value of +5kPa at times and then again +5kPa indicates that the transmitter is not operating stably, or that there are fluctuations in the system. In such conditions, it is pointless to adjust the transmitter; adjustments should only be made once stability is achieved.
Setting the atmosphere to zero should do it, right?
For a gauge at 100 kPa, is the zero drift ±5 kPa? ,,, That’s amazing, but it’s a bit excessive, too much... It’s unstable and lacks consistency; I need to change the gauge. Just adjusting the zero point isn’t enough to stop its drift....
This is a quality issue with the product; it can only be repaired at the factory. There’s a drift at 0 point – no matter how you calibrate it, it’s not accurate