Liquid Level Measurement - Emerson Rosemount 2051 Reference Manual

Hardware Installation
September 2020
2. Loosen manifold valve jam nut.
3. Tighten manifold valve packing adjuster nut turn.
4. Tighten manifold valve jam nut.
5. Re-apply pressure and check for leaks.
Example
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. Bonnet
B. Ball seat
C. Packing
D. Stem
E. Packing adjuster
F. Jam nut
G. Packing follower
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.
3.6.1 Open vessels
A pressure transmitter mounted near a tank bottom measures the pressure of the liquid
above.
Make a connection to the high pressure side of the transmitter, and vent the low pressure
side to the atmosphere. Pressure head equals the liquid's specific gravity multiplied by the
liquid height above the tap.
60
A
D
C
B
Reference Manual
00809-0100-4107
E
F
G
Rosemount 2051 Pressure Transmitter