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Instruction Manual
Form 1446
November 2006
process pressure or liquid. This
danger may not be readily apparent
when disassembling the sensor or
removing the displacer. Before
disassembling the sensor or removing
the displacer, observe the more
specific warning provided in the
sensor instruction manual.
Uncrating
Unless ordered separately, the controller will be
attached to the sensor when shipped. Carefully
uncrate the assembly.
CAUTION
If the sensor has a thin-walled torque
tube, always support the displacer if
the travel stop must be removed. A
thin-walled torque tube has a T
stamped on the sensor end flange (not
visible unless the controller is
removed from the sensor).
Caged sensors have a rod and block
installed on each end of the displacer
to protect the displacer in shipping.
Remove 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 damping plate. For screwed connections, use a
1/2-inch 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
separated from the sensor assembly. A displacer
longer than 813 mm (32 inches) is crated separately.
A shorter displacer is crated with the sensor, but is
Note
2502 Series Controllers
PRESSURE
LOCKNUT
REGULATOR
1/4"-18 NPT
OUTPUT
CONNECTION
VENT
Figure 3. Pressure Connections
not attached 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
orientation 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 required; refer to the
appropriate sensor manual for instructions.
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.
Controller-Sensor Action
The following controller description is for right-hand
mounting. Left-hand mounting produces an output
signal with the opposite action. Figure 4 shows cage
head mounting positions.
For right-hand mounting:
D Direct Action—Increasing liquid or interface
level, or density, increases the output signal.
D Reverse Action—Decreasing liquid or interface
level, or density, increases the output signal. A
factory-supplied reverse-acting unit has the suffix
letter R added to the type number.
ADJUSTING
SCREW
1/4"-18 NPT
SUPPLY
CONNECTION
DRAIN VALVE
5
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