Can the condenser, used for measuring steam flow, be installed below the differential pressure transmitter?
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The condensation tank is located lower than the differential pressure transmitter, so the transmitter does not come into contact with the condensate; it is filled with air. Does this have any impact on the measurements?
The condensation tank is usually installed below the differential pressure transmitter, but it is necessary to ensure that the liquid level in the condensation tank is higher than that of the differential pressure transmitter, in order to prevent measurement errors caused by the liquid in the tank. If the condenser tank is positioned too low and there is air inside the differential pressure transmitter, the steam flow rate cannot be measured accurately, as air cannot transmit pressure difference signals effectively. Therefore, in practical operation, the condensation tank should be installed in a location that allows its liquid level to remain above the differential pressure transmitter, without interfering with the proper functioning of the transmitter. .
Yes, I also think that the location of the condensation tank should not be above the differential pressure transmitter. But today I saw such an installation standard in the instrument technician’s manual, which made me a bit unsure, so I came here to ask the experts for clarification
Who did you all hear that from? ;P
Instrumentation Project Construction Manual Chapter 21: Installation of Instrumentation Piping and Fabrication of Auxiliary Containers
I was wrong; it should be that the differential pressure transmitter cannot be placed above the condensation tank
The transmitter must be installed below the condensate tank to ensure that the condensate fills the tube completely and that the positive and negative pressure sides are at the same height, thereby reducing additional errors.
Use vortex flow meters if possible; if that’s not an option, use this device – orifice plates are really not effective. The orifice plate deforms, resulting in different temperatures measured under positive and negative pressures; even slight changes in pressure have a significant impact on the measurements.
If the condenser is above the differential pressure transmitter, then what’s the need for a condenser at all?