Emerson Rosemount 2240S, Reference Manual, Page: 35 / 194

25
Reference Manual
00809-0100-2240, Rev DA
MST/WLS Installation
October 2017
MST/WLS Installation
3.4 Water Level Sensor
The water level sensor (WLS) probe, with integrated temperature elements, is attached at the lower end
of the flexible protection tube. A weight is attached to stabilize the tube as illustrated in
Figure 3-4 . At
the upper part of the sensor probe, nuts are placed at the middle of the threaded section, 350 mm below
the top of the probe. This is intended as a starting point for adjusting the vertical position of the probe.
Figure 3-4. Water Level Sensor with integrated temperature sensors
As an option, the tube may be stabilized by putting a concentric weight above the WLS probe, instead of
at the end, in order to ensure that measurements are performed as close to the tank bottom as possible.
Also, the eyebolt at the end of the tube can be removed.
See also “Water Level Sensor calibration” on page 53 and “Water Level Sensor measuring range” on
page 55 for more information on how to calibrate and configure the water level sensor.
Upper Sensor Limit (100%)
Lower Sensor Limit (0%)
WLS Probe Active Length
Standard: 500 mm (19.7 in.)
Option: 1000 mm (39.4 in.)
Recommended minimum distance: 1 m ( 3.3 ft)
Weight
3
50 mm
(1
3.8
in.)
Nuts to adjust
vertical position of
the sensor probe