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A pressure differential gauge type of instrument has a
manifold with 2 isolation valves (hp and lp),2 vents(1 each
for hp and lp) and 1 equalizing valve. Determine the
position of each valve(either fully closed or fully open)
when troboulshooting to:
1. zero the transmitter.
2. determine if there is a block in the impulse line.
3. determine if the gauge is functioning properly.
The process fluid is water.
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Answer / abinecious
If u close both hp and lp isolation valves and open the equalizing valve u'll get zero reading means the gauge ll working properly and also u came to know zero output is also true. if any block is there means the gauge r transmitter shows full scale reading.
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