What should the pressure reading be when a swirl vortex flow meter is not installed?
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Dear teachers! I have three smart rotameter vortex flowmeters, and due to the passage of time, it’s no longer possible to get in touch with the manufacturer. I want to use it now; it’s not installed yet. I’ve replaced the battery and the display is working properly. The temperatures of the three gauges are similar, but the pressure difference is quite large. They are -3.7 kPa, 3.6 kPa, and 17.6 kPa respectively. I would like to ask whether this is normal? It’s not normal. How much should it display, and how do I adjust it? Thanks!
It is abnormal if the displayed pressure does not match the actual pressure; check whether the pressure transmitter is functioning properly and whether the parameters in the flow meter are set correctly.
At normal pressure, it should be 0; your estimate is completely wrong
Check what the normal operating pressure is; if it’s relatively high, this factor can be almost ignored. Also, see if there is a menu in the flow meter’s settings for pressure zero calibration
The pressure should read 0 when indicated in gauge pressure, and the local atmospheric pressure when indicated in absolute pressure. The first two can be adjusted back after recalibration, but the last one is off by quite a bit; it’s better to consult the manufacturer.
If it is not installed on a pipeline, the local gauge pressure should be displayed.
That’s definitely not normal. Three gauges in the same place showing three different pressures – it would be strange if there were no issues. Check whether the gauges have a function to calibrate the zero point; calibrate it accordingly. If the pressure under operation is high, this issue can be ignored. But if the pressure isn’t high and calibration isn’t possible, then replace the sensor. If replacement isn’t an option, just use it as is. And if it can no longer be used, buy a new one