2502 Series Controllers
Instruction Manual
Form 1446
November 2006
7
DRAIN
CENTER OF
LIQUID OR
INTERFACE
LEVEL
DF5379-A
A6771/IL
SHUTOFF
VALVES
VENT
EQUALIZING
LINE
Figure 6. Caged Sensor Mounting
Mounting Cageless Sensor
Note
If a stillwell is used, it must be
installed plumb so that the displacer
does not touch the wall of the stillwell.
Should the displacer touch the wall
while the unit is in service, the unit will
transmit an erroneous output signal.
Since the displacer hangs inside the vessel, provide
a stillwell around the displacer if the liquid is in a
state of continuous agitation to avoid excessive
turbulence around the displacer.
Note
Displacers used in an interface level
application must be completely
submerged during operation. If
displacers aren’t completely
submerged they will not calibrate or
perform properly. To obtain the
desired controller sensitivity may
require using either a thin-wall torque
tube, an oversized displacer, or both.
CF5380-A
A3893/IL
TOP
MOUNTED
SIDE (SHOWING STILLWELL)
W0645-1
TOP
Figure 7. Cageless Sensor Mounting
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