Siemens 7MF4333 User Manual page 58

Installation
Max. Range
Span
Min. Range
Suppressed-Zero: To
calculate maximum
distance, subtract
actual span setting
from range limit given
in specification.
Dripleg and Drain Valve
A. Pressurized (Closed) Vessel Installation:
Non-Condensable Fluid
Max. Range
Span
Min. Range
Suppressed-Zero: To
calculate maximum
distance, subtract
actual span setting
from range limit given
in specification.
C. Open Vessel Installation
FIGURE 4-2 Differential Liquid Measurement Piping
4-6
LP Shut-Off
Valve
HP Shut-Off
Valve
LP line
empty -
not filled
with con-
densate.
Note 3
Note 1
HP LP
HP Shut-Off
Valve
Vent
Vent
HP LP
Fill Connection
LP Shut-Off
Valve
Elevated-Zero,
Distance Y,
Max. Range
Note 5
Span
Min. Range
HP Shut-Off
Valve
Distance X
See Note 4
B. Pressurized (Closed) Vessel Installation:
Condensable Fluid
Notes:
1. Transmitter may be mounted at or below the
minimum level to be measured.
2. Open or vented vessels require only a high pressure
(HP) connection.
3. High pressure line senses static pressure plus level.
Low pressure line senses pressure only. The two
pressures oppose each other, canceling the effect
of static pressure.
4. Distance "X" can be any distance since both high
and low pressure lines have equal and opposite
forces which cancel the forces created by this
distance.
5. Entire length of low pressure pipe is kept full of
condensate to act as a reference.
6. See Appendix C for information on calculating
suppressed and elevated zero ranges.
UMSITRPDS3-1
See
Section 9
Specifi-
cations
for range
limit.
LP line
filled with
Note 3
condensate
HP LP
November 2010