Uncrating; Controller Orientation; Mounting Caged Sensors - Fisher 2502 Series Level-Trol Instruction Manual

2502 Series
WARNING
When replacing the sensor assembly,
the displacer may retain process liquid
or pressure. Personal injury or property
damage due to sudden release of pres-
sure, contact with hazardous liquid, fire,
or explosion can be caused by punctur-
ing, heating, or repairing a displacer
that is retaining process pressure or liq-
uid. This danger may not be readily ap-
parent when disassembling the sensor
or removing the displacer. Before disas-
sembling the sensor or removing the
displacer, observe the more specific
warning provided in the sensor instruc-
tion manual.

Uncrating

Unless ordered separately, the controller will be at-
tached to the sensor when shipped. Carefully uncrate
the assembly.
CAUTION
A thin-wall torque tube has a T stamped
on the sensor end flange (not visible un-
less the controller/transmitter is re-
moved from the sensor). For sensors
with a thin-wall torque tube, always sup-
port the displacer if the travel stop must
be removed.
Caged sensors have a rod and block
installed on each end of the displacer to
protect the displacer in shipping. Re-
move these parts before installing the
sensor to allow the displacer to function
properly.
Caged sensors will be shipped with the displacer
installed in the cage. If the sensor is ordered with a
tubular gauge glass, the gauge glass will be crated
separately and must be installed at the site. Be certain
that the cage equalizing connections are not plugged
with foreign material.
A caged sensor has a damping plate installed in the
lower screwed or flanged connection to provide more
stable operation. If the process liquid could clog the
plate opening with sediment, then remove the damp-
ing plate. For screwed connections, use a 1/2-inch
4
Note
LOCKNUT
PRESSURE
REGULATOR
1/4"-18 NPT
OUTPUT
CONNECTION
CD1700-E
VENT
A1909-1/IL
Figure 3. Pressure Connections
(12.7 mm) hexagon wrench to unscrew the damping
plate. For flanged connections, use a screwdriver to
pry the damping plate out of the flange.
A cageless sensor is shipped with the displacer sepa-
rated from the sensor assembly. A displacer longer
than 32 inches (813 mm) is crated separately. A short-
er displacer is crated with the sensor, but is not at-
tached to the displacer rod. Inspect the displacer and
replace if it is dented. A dent may reduce the pressure
rating of the displacer.

Controller Orientation

A controller is to be mounted with the vent opening
pointing downward as shown in figure 3. This orienta-
tion is necessary to ensure draining of accumulated
moisture. The controller is attached to the sensor in
one or the other of the mounting positions shown in
figure 4: Right hand (with the case to the right of the
displacer when looking at the front of the case) or left
hand (with the case to the left of the displacer). The
mounting position can be changed in the field if re-
quired; refer to the appropriate sensor manual for in-
structions. Changing this mounting position will change
controller action from direct to reverse, or vice versa.
All caged sensors have a rotatable head. That is, the
controller may be positioned at any of eight alternate
positions around the cage as indicated by the numbers
1 through 8 in figure 4. To rotate the head, remove the
head flange bolts and nuts and position the head as
desired.
Mounting Caged Sensor
CAUTION
The cage must be installed plumb so
that the displacer does not touch the
cage wall. Should the displacer touch
the cage wall, the unit transmits an erro-
neous output signal.
ADJUSTING
SCREW
1/4"-18 NPT
SUPPLY
CONNECTION
FILTER WELL
DRAIN VALVE