About the verification process of the pressure transmitter in the technical chapter

In this article, we will analyze the verification process of the pressure transmitter from a technical point of view. The verification process of the pressure transmitter mainly includes the following parts. First, check the accuracy of the instrument and zero it. Identify the zero point, otherwise, there will be errors in the subsequent measurement process, which will have a certain impact on the measurement accuracy. The zero-adjustment process is as follows: First, fill the two gas chambers H and L into the atmosphere, and then observe the reading of the ammeter. If the reading is 4 mA, the zero position is correct. Otherwise, you need to manually adjust the zero-adjustment button until the reading is displayed. is 4 mA. Second, the range needs to be adjusted. The specific process is to use a pressure source to slowly pressurize it to the maximum value. At this time, the indication of the ammeter should be 20 mA. Otherwise, it is necessary to adjust the range to 20 mA before performing the zero adjustment work first. Then adjust the range until the current indication number is displayed as 20 mA when the pressure reaches the maximum value. Note that the pressurization speed must be controlled in the process of pressurization. If the pressurization speed is too large, the reading of the current indicator will be unstable, resulting in certain errors. Third, divide the range into equal parts. Fill the corresponding pressure into the H tank, and the corresponding output will be obtained. After many repeated tests, the basic error and variation between them will be obtained. If the error is large, the adjustment test needs to be re-adjusted until the requirements are met. . Before verification, the transmitter and related instruments need to be kept warm to achieve thermal equilibrium. To preheat the pressure tube and signal line, the pressure-taking plane of the pressure transmitter needs to be the same as that of the standard device. Pressurize slowly, turn off the pressure source after reaching the maximum value, and seal for at least 15 minutes. During this time, it is necessary to ensure that there is no leakage of gas in the pressure chamber to ensure air tightness. During the measurement process, the pressure transmitter must strictly abide by the standard display error and the relevant standards for the influence of static pressure.

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