Calibration of flange level gauges
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This post was last edited by gaosen008003 on 2011-10-21 08:12. Today I saw a level gauge: the positive-pressure side had a capillary flange, while the negative-pressure side used a pressure transfer tube. The positive side was in direct contact with the liquid, whereas there was no liquid inside the negative side. Under normal conditions, there is negative pressure inside the pressure transfer tube. The measurement range is 0–200 kPa. After installing it on the positive-pressure side, the pressure generated by the capillary was 16 kPa, with atmospheric pressure assumed to be 94 kPa. What should the gauge range be, from how much to how much?
Put a post at the top; let’s see if anyone will come and talk about this topic
16kpa----- 216kpa
Reply to 3# wangyongan: Brother, how did you do the calculation? Please explain the reasoning
Reply to 4# gaosen008003: Measuring liquid level with a differential pressure transmitter is independent of atmospheric pressure； The pressure guide tube on the negative pressure side is empty; the measurement error comes solely from the capillary at the positive pressure end, and this can be corrected by removing it.
Theoretically, it’s as mentioned on the third floor, but I’ve really never seen such a transmitter
Theoretically, it’s as mentioned on the third floor, but I’ve really never seen such a transmitter
Bro, under normal manufacturing conditions, the negative pressure reading is indeed negative – at -3 kPa. If negative pressure is not taken into account, then that -3 kPa value has no significance
I was wrong; it’s an absolute pressure of 3 kPa
The principle of this gauge you mentioned should be the same as that of a double-flange level gauge. It’s just that a pressure tap is used on the negative pressure side. The range is 0–200; you need to calculate what the measurement range is, right? By determining the migration amount to 16 KPa, the measurement range is calculated (16–216 KPa). It is independent of positive or negative pressures, as these cancel each other out.