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Cageless 249VS Sensor
Mounting the Sensor on the Process
Vessel
CAUTION
If inserting the displacer into the
vessel before attaching it to the
displacer rod, provide a means of
supporting the displacer to prevent it
from dropping into the vessel and
being damaged.
Install the sensor wafer body on the vessel using the
following procedure.
Attach the displacer to the displacer rod (see
figure 7) before installing the sensor on the vessel.
1. Place a connecting flange gasket on the sensor
assembly.
2. Install four line flange studs and nuts in the
connecting flange at locations that correspond to the
sensor mounting lug locations.
3. Insert the displacer and the 249VS sensor into
the process connection/vessel.
4. Place a blind flange on the back of the sensor
and lightly secure (tightening nuts enough to hold
wafer body and gasket in place) using four line
flange bolt nuts, centering the connecting flange
gasket and sensor on the vessel connecting flange.
5. Install the remaining line flange bolts and nuts.
6. Tighten all nuts in a crisscross fashion.
Maintenance
Sensor parts are subject to normal wear and must
be inspected regularly and replaced as necessary.
The frequency of inspection and replacement
depends upon the severity of service conditions.
WARNING
Always wear protective clothing,
gloves, and eyewear when performing
any maintenance operations to avoid
personal injury.
Avoid personal injury or property
damage resulting from the sudden
release of pressure. Before performing
any maintenance procedure:
6
COTTER SPRING
DISPLACER
STEM
EXTENSION
W9357
Figure 7. Displacer and Displacer Rod Connections
D Relieve any process pressure in
the process vessel where the Type
249VS sensor is installed.
D Drain the process liquid from the
process vessel.
D Shut off any electrical or
pneumatic input to the controller or
transmitter attached to the Type 249VS
sensor and vent any pneumatic supply
pressure.
D Use caution when loosening
flange bolting.
D Remove the controller or
transmitter from the torque tube arm
(key 1).
Before performing any maintenance
procedure requiring the handling of
the displacer, inspect the displacer
(key 9) to make sure process pressure
or liquids have not penetrated the
displacer.
The displacer in this unit is a sealed
container. If penetrated by process
pressure or liquid, the displacer may
hold pressure or hazardous liquid for
an extended period. A displacer that
has been penetrated by process
pressure or liquid may contain:
D pressure as a result of being in a
pressurized vessel.
D liquid that becomes pressurized
due to a change in temperature.
Instruction Manual
Form 5831
November 2007
DISPLACER ROD
LOCKING NUTS
DISPLACER SPUD
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