Causes of static pressure error of differential pressure transmitter

The main reason for the static pressure error of the differential pressure transmitter is the unequal effective area of ​​the positive and negative pressure chamber diaphragms. Under the same pressure, the resultant force on the bellows is not zero, so an additional moment M: will be generated, which will offset the position of the main lever and cause the zero position drift. The magnitude of the moment M, can be obtained from the following formula M:==?APL where △A—the difference between the effective areas on both sides of the diaphragm P—static pressure L—the distance from the end of the main lever to the center of the sealing diaphragm. The differential pressure scale of the differential pressure transmitter is usually calibrated under the condition that the negative pressure chamber is open to the atmosphere. When it is installed to the site and the actual static pressure calibration is used, it is often found that the zero output and the negative pressure chamber are open to the atmosphere for calibration. When the zero output is inconsistent. The zero position output obtained when the positive and negative pressure chambers are connected to the same static pressure deviates from the zero position when the positive and negative pressure chambers are connected to the atmosphere for calibration, which is called static pressure error. If the static pressure error of the differential pressure transmitter is not corrected, it will bring errors to the flow measurement, and the impact is more considerable when the relative flow is small. Therefore, we must correct the static pressure error before putting it into use. The specific correction method for the static pressure of the differential pressure transmitter is as follows: the method is to pass the same static pressure into the positive and negative pressure chambers, open one of the high and low pressure valves of the three-valve group, close the other, and open the balance valve. If the positive and negative pressure chambers are not yet filled with the measured medium, the accumulated gas (or accumulated liquid) can be drained through the exhaust (or drain) valve on the positive and negative pressure chambers, and then the output of the differential pressure transmitter can be checked. This method can completely eliminate the static pressure error, so that the accuracy of the differential pressure transmitter can be guaranteed.

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