2502 Series Controllers
Instruction Manual
Form 1446
November 2006
8
Note
If the controller is not mounted on the
sensor, refer to the Installing
Controller on Sensor 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
liquid level applications, install a gauge glass on the
vessel.
CAUTION
If the displacer is to be inserted into
the vessel before being attached to the
displacer rod, provide a suitable
means of supporting the displacer to
prevent it from dropping into the
vessel and suffering damage.
To help support a Type 249BP or 249CP displacer,
install the displacer stem and stem end piece, or a
threaded rod, into the 1/4 inch-28 UNF threaded
hole in the displacer spud or stem end piece (figure
8). On the Type 249BP with optional travel stop, the
stem end piece pins will secure the displacer as long
as the travel stop plate is installed and the sensor
head is in position.
Side-Mounted Sensor
If a stillwell is required (figure 7), the displacer must
be attached 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, the displacer can be
attached to the displacer rod before mounting the
sensor to the vessel connection. The displacer may
then be swung 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displacer may not be capable of being withdrawn for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.
W0228-1A/IL
DISPLACER ROD
DISPLACER
SPUD
ALL OTHER TYPES
COTTER SPRING
W0229-1A/IL
COTTER SPRING
DISPLACER ROD
LOCKING NUTS
DISPLACER SPUD
DISPLACER
STEM
EXTENSION
DISPLACER
STEM
END PIECE
TYPE 249V
Figure 8. Displacer/Displacer Rod Connections
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
Figure 7 shows the installation of a top-mounted
cageless sensor. The displacer may be attached to
the displacer rod before installing the sensor on the
vessel. Where the displacer diameter is small
enough, it may be desirable to install a long or
sectionalized displacer through the sensor head
access hole after the sensor is installed on the
vessel. Connect the displacer as shown in figure 8,
locking the assembly with the cotter springs
provided. If a stem is used between the displacer as
shown in figure 8, lock the assembly with the cotter
springs provided. If a stem is used between the
displacer spud and the stem end piece, make sure
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