Table of Contents
Type 2500
CENTER OF
LIQUID OR
INTERFACE LEVEL
DF5379-A
A1883-2/IL
Figure 6. Caged Sensor Mounting
Mounting Cageless Sensor
If a stillwell is used, install it plumb so
that the displacer does not touch the
wall of the stillwell. If the displacer
touches the wall, the unit will transmit
an erroneous output signal.
Since the displacer hangs inside the vessel, provide
a stillwell around the displacer if the fluid is in a state
of continuous agitation to avoid excessive turbulence
around the displacer.
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 or transmitter
sensitivity may require using either a
thin-wall torque tube, an oversized
displacer, or both.
8
EQUALIZING
LINE
SHUTOFF
VALVES
DRAIN VALVE
EQUALIZING LINE
Note
Note
If the controller/transmitter is not
mounted on the sensor, refer to the
Installing Controller/Transmitter on
Sensor procedures in the Maintenance
section. This section also provides
instructions for adding a heat insulator
to a unit.
Attach a cageless sensor to a flanged connection on
the vessel as shown in figure 7. For interface or fluid
level applications, install a gauge glass on the
vessel.
Side-Mounted Sensor
If a stillwell is required (see figure 7), attach the
displacer to the displacer rod from inside the vessel.
Connect the displacer as shown in figure 8, locking
the assembly with the cotter spring provided. If a
stillwell is not required, attach the displacer rod
before mounting the sensor on the vessel. Then, you
can swing the displacer out horizontally for insertion
into the vessel. However, once the sensor is
installed and the displacer drops to a vertical
position, the displacer may not be capable of being
withdrawn for servicing later. Be sure there is
another access to the displacer to permit swinging it
to a horizontal position or to permit disconnecting it
from the displacer rod.
If an extension is used between the displacer spud
and the displacer stem end piece, make sure the
nuts are tight at each end of the displacer stem
extension. Install and tighten suitable bolting or cap
screws in the flanged connection to complete the
installation.
Top-Mounted Sensor
CAUTION
If inserting the displacer into the
vessel before attaching to the
displacer rod, provide a means of
supporting the displacer to prevent it
from dropping into the vessel and
suffering damage.
Figure 7 shows an example of a top-mounted
cageless sensor. You may attach the displacer to
the displacer rod before installing the sensor on the
vessel. If the displacer diameter is small enough,
you may install a long or sectionalized displacer
Instruction Manual
Form 1013
December 2005
Note
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