Emerson Rosemount 2240S, Reference Manual, Page: 65 / 194

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Reference Manual
00809-0100-2240, Rev DA
Configuration/Operation
October 2017
Configuration/Operation
5.3.3 Water Level Sensor measuring range
Reference Points
The Water Level Sensor has two reference points, the Upper Reference Point and the Water Zero Level ,
which are marked on the probe. The positions are given in Figure 5-5 below:
Figure 5-5. Tank geometry for the water level sensor
Level offset
The Level Offset X , referred to as the distance between Tank Zero Level and Water Zero Level, needs to be
considered when configuring the WLS. X can be calculated from known tank distances as described in
“Converting from WLS to tank reference system” on page 57 . The various distances are illustrated in
Figure 5-5 and Figure 5-7 on page 58 .
Tank Zero Level
Tank Reference Point
Upper Reference Point
Water Zero Level
Upper Sensor Limit (100%)
Lower Sensor Limit (0%)
Mark
Level offset
Ta
n
k Re
fer
en
ce
H
ei
g
h
t (
R
)
Active length
(L
A
)