Rosemount 3051S - Page 93

85
Reference Manual
00809-0100-4803, Rev GA
Installation
September 2017
Installation
In-line transmitters
2-valve and block and bleed style manifolds
Isolating the transmitter
In normal operation the isolate (block) valve between the process
port and transmitter will be open and the test/vent valve will be
closed. On a block and bleed style manifold, a single block valve
provides transmitter isolation and a bleed screw provides drain/vent
capabilities.
1. To isolate the transmitter, close the isolate valve.
2. To bring the transmitter to atmospheric pressure, open the vent
valve or bleed screw.
Note
A
1
/4-in. male NPT pipe plug may be installed in the test/vent port
and will need to be removed with a wrench in order to vent the
manifold properly.
Always use caution when venting directly to atmosphere.
3. After venting to atmosphere, perform any required calibration
and then close the test/vent valve or replace the bleed screw.
Transmitter
Isolate
Vent
(closed)
Process
(open)
Transmitter
Isolate
Vent
(closed)
Process
(closed)
Transmitter
Isolate
Vent
(open)
Process
(closed)
Transmitter
Isolate
Vent
(closed)
Process
(closed)