Specifications

Reference Manual
00809-0200-4801, Rev CA
July 2010
Rosemount 3051S Series
2-18
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 block 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 3051S, close the block valve to the low
pressure (downstream side) of the transmitter first.
Drain/
Vent
Valve
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.