EJA110 measures steam pressure; how to eliminate the static pressure of condensate water
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The EJA110 differential pressure transmitter is used to measure steam pressure; the sampling point is located above the transmitter. Condensate in the pressure guiding tube creates a static pressure on the transmitter. How can this static pressure be removed using a communicator?
It is possible to measure the height of the condensed water inside the pressure guide tube, calculate the static pressure, and then proceed with positive migration
This post was last edited by wood8421 on 2010-9-2 at 23:41. What the original poster said isn’t very clear; in theory, the pressure measurement for an EJA differential pressure transmitter is taken from the pressure difference before and after the orifice plate, or from a venturi tube, and then this pressure is fed into the positive pressure chamber and the negative pressure chamber via a three-valve assembly. When steam flows, the pressure in the positive-pressure chamber or the negative-pressure chamber is respectively determined by the steam pressure plus the condensate water pressure. When steam is not flowing, it is generated by the pressure of condensate water. Theoretically, the positive and negative pressures should be equal, meaning the pressure difference is zero. Moreover, we generally don’t pay much attention to static pressure in instrument settings, or it can be ignored; these are matters for consideration by the instrument manufacturers. On the second floor, I haven’t heard of any need to relocate differential pressure transmitters when using them to measure flow rate; do you think they’re used for measuring liquid level? ?
How does LZ use differential pressure to measure pressure? Is the steam pressure only 1 kilogram?
Firstly, it is not quite appropriate for the original poster to use an EJA110 to measure pressure, especially steam pressure, as the EJA110 is a differential pressure transmitter. If a pressure transmitter is used to measure steam pressure, such as the EJA438, there is no issue with pressure conduits, as long as the temperature does not exceed 250 degrees.