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Reference Manual
00809-0200-4101, Rev AA
July 2008
2-29
Rosemount 2051
Integral Manifold Operation
Three-valve configuration shown.
Drain/
Vent
Valve
Drain/
Vent
Valve
Equalize
(closed)
Process
Isolate
(open)
Isolate
(open)
H
L
In normal operation the two isolate valves between the
process and instrument ports will be open and the
equalizing valve(s) will be closed.
Drain/
Vent
Valve
Equalize
(closed)
Process
Isolate
(closed)
Isolate
(open)
H
L
To zero the 2051, close the isolate valve to the low
pressure (downstream side) of the transmitter first.
Drain/
Vent
Valve
Drain/
Vent
Valve
Equalize
(open)
Process
Isolate
(closed)
Isolate
(open)
H
L
Next, open the center (equalize) valve(s) to equalize
the pressure on both sides of the transmitter.