Emerson 3051S Dokumentacja Strona 44

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34
Reference Manual
00809-0100-4001, Rev JA
Section 2: Installation
November 2012
Installation
2.12 Liquid level measurement
Differential pressure transmitters used for liquid level applications measure hydrostatic pressure
head. Liquid level and specific gravity of a liquid are factors in determining pressure head. This
pressure is equal to the liquid height above the tap multiplied by the specific gravity of the
liquid. Pressure head is independent of volume or vessel shape.
Test
(Plugged)
Test
(Plugged)
Equalize
(closed)
Process
Isolate
(closed)
Isolate
(open)
H
L
2. Open the equalize valve on
the high pressure (upstream)
side of the transmitter.
Process
Equalize
(open)
Drain
Vent
(closed)
3. Open the equalize valve on
the low pressure
(downstream) side of the
transmitter. The manifold is
now in the proper
configuration for zeroing the
transmitter.
Test (Plugged)
Test
(Plugged)
Equalize
(open)
Process
Isolate
(closed)
Isolate
(open)
H
L
Process
Equalize
(open)
Drain
Vent
(closed)
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