Problems with using differential pressure transmitters to measure liquid levels
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When using a differential pressure transmitter to measure liquid level, is it necessary to first fill the reference tube (the negative pressure side) with liquid before setting the zero point? Could someone provide a more detailed procedure for this? Thank you
First, determine whether to measure the liquid level in a pressurized, sealed tank. In that case, both the positive and negative pressure sides must be installed on the storage tank, and the zero point should be calibrated when the liquid level is at zero. If it is a pressure vessel at normal pressure, a differential pressure transmitter is not required to measure the liquid level. A pressure transducer with a small range is usually sufficient.
When using a differential pressure transmitter to measure liquid level, it is necessary to fill the negative pressure side with liquid – this depends on the medium being measured. For media that tend to condense, filling is required; it is not necessary for ordinary media. For example, a differential pressure transmitter used to measure the level of a deaerator needs to have its negative pressure side filled with water.
I still don’t quite understand. Could you explain in more detail? Using a differential pressure transmitter to measure liquid level requires that the system be sealed. Thank you
If there are non-corrosive gases above the sealed tank, it is not necessary to fill it with liquid; if there are corrosive gases, then the tank must be filled with a shielding fluid, and the transmitter needs to be relocated
It depends on whether there is steam. If there is, liquid should be added
When using a differential pressure transmitter to measure the liquid level in a sealed container, is it necessary to fill the negative pressure side with liquid? 1. If a dual-flange differential pressure transmitter is used, it is sufficient to set the parameters according to the range before installation. 2. For transmitters that use pressure conduits, it is necessary to determine whether an isolation fluid should be used; if so, zeroing must be performed after adding the fluid. 3. For media that tend to condense, a drain pipe should be installed to allow for regular drainage