Differential pressure transmitter calibration
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This post was last edited by zhangzheyuanxp on 2016-4-23 22:16. A differential pressure transmitter (of the pressure tap type, with one end connected to the tank and the other end to the air) is used to measure the liquid level in a container; the medium is hydraulic oil with a density of 0.87. How can this transmitter be calibrated? The actual required liquid level is 0~350mm. It is only necessary to verify that 0 point corresponds to 4 mA; is it also necessary to verify that the liquid level corresponding to 100% requires 20 mA? It would be better if you could explain in more detail how to verify it.
It is necessary; for specific details, please check the relevant inspection regulations
For specific verification methods, refer to JJG 882_2004 \"Calibration Regulations for Pressure Transmitters\".
The range is 0–2.98 KPA. If there is a drift in the zero point, it can be adjusted accordingly; when the tank is empty, the reading is 0 KPA with an output of 4 Ma. At 350 MM, the pressure is approximately 3 KPA, resulting in an output of 20 Ma
In practice, when hydraulic oil needs to be raised to 350 mm, should we use 475 to verify that 100% corresponds to 20 mA? Or when it is raised to 175 mm, should we verify that 50% corresponds to 12 mA?