Liquid Level Measurement - Emerson Rosemount 2051 Reference Manual

Reference Manual
00809-0300-4101, Rev BB
Adjusting valve packing
Over time, the packing material inside a Rosemount manifold may require adjustment in
order to continue to provide proper pressure retention. Not all Rosemount manifolds have
this adjustment capability. The Rosemount manifold model number will indicate what type
of stem seal or packing material has been used.
The following steps are provided as a procedure to adjust valve packing:
1. Remove all pressure from device.
2. Loosen manifold valve jam nut.
3. Tighten manifold valve packing adjuster nut
4. Tighten manifold valve jam nut.
5. Re-apply pressure and check for leaks.
Above steps can be repeated, if necessary. If the above procedure does not result in proper
pressure retention, the complete manifold should be replaced.
Figure 3-11. Valve Components
A
D
C
B
A. Bonnet
B. Ball seat
C. Packing
D. Stem
3.6

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.
Hardware Installation
E
F
G
E. Packing adjuster
F. Jam nut
G. Packing follower
Hardware Installation
/ turn.
1
4
November 2016
33