Issues regarding pressure protection alarms and similar things
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This post was last edited by juncaide on 2010-10-22 09:55. In terms of pressure protection, what do terms such as pressure indication, pressure indication alarm, local pressure gauge, differential pressure transmitter, and pressure switch mean? Thank you all
Why isn’t anyone responding? Waiting
A pressure indicator refers to the numerical value that shows the pressure. A pressure indication alarm is a signal that indicates when the pressure exceeds a specified value; an on-site pressure gauge is a gauge that displays the pressure directly at the location of the equipment. A differential pressure transmitter is a device that measures pressure differences; it is an electrical component. A pressure switch, on the other hand, is…
I’m still not sure about the pressure indication and pressure gauges; on the drawings it’s usually shown as PI, PIAS, PG – it’s a bit hard to tell them apart
So, does the pressure transmitter include the above?
The last edit to this post was made by 0237967500 on 2010-10-28 at 14:37. Reply 5# juncaide: A pressure transmitter is the transducing element in a pressure gauge; in PID systems it seems to be denoted as PT, while the sensing element is indicated as PE. Such devices are generally found in instruments that are connected to DCS systems (I need someone with expertise in instrumentation to confirm this – I’m not entirely sure). PI refers to elements that provide indications within the DCS system, PG denotes elements for local display, and PIAS refers to elements that provide indications in the DCS system along with alarm functions. Pressure switches are interlocked with shut-off valves – when the pressure reaches a certain level, the shut-off valve opens or closes
I just consulted our instrumentation experts, and they said that PE and PT are now integrated together; it’s generally referred to as PT. In other words, any pressure instrument connected to the DCS will have a PT designation
Reply to 7# 0237967500: I now understand better what you mean. PT refers to a converter, PG is an on-site pressure gauge, and the rest are displayed on the station control system. Thank you