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Instruction Manual
D103288X012
1. After following the proper procedure to remove the sensor assembly and the displacer from the process vessel,
move the sensor assembly to a suitable maintenance area.
2. Remove the controller/transmitter and displacer/displacer stem (key 9).
3. Follow the proper procedure to remove the torque tube assembly (key 10).
4. Remove the bearing bolts (key 4), displacer rod assembly, and driver bearing.
Note
Be sure to install the driver bearing so its knife edge is pointing up when the torque tube arm is mounted in the desired orientation.
Since changing the mounting position of the torque tube arm by 180_ will change controller or transmitter action from direct to
reverse or vice versa, controller/transmitter action must be reversed from what it was before the mounting method was changed.
5. Install the bearing driver and the lower bearing bolt into the torque tube arm. Place the rod/driver assembly on the
knife‐edged surface of the driver bearing. Install the bolt and tighten both the top and the bottom bearing bolts.
6. Install a new tube end gasket (key 17) and torque tube into the torque tube arm. Install the controller/transmitter
and attach the displacer/displacer stem to the rod/driver assembly.
7. Install the sensor assembly to the process vessel and calibrate the controller/transmitter following the procedures
given in the controller/transmitter instruction manual.
8. Calibration of the controller/transmitter can be done prior to installing of the sensor assembly to the process vessel
using the simulation of process conditions method.
Simulation of Process Conditions for Calibration of Fisher Level
Controllers and Transmitters
Contact your Emerson sales office or Local Business Partner for information on obtaining the Supplement to 249
Sensor Instruction Manuals—Simulation of Process Conditions for Calibration of Fisher Level Controllers and
Transmitters (D103066X012), or visit our website at www.Fisher.com .
Parts Ordering
When corresponding with your Emerson sales office or Local Business Partner about this equipment, always refer to
the sensor serial number. Each sensor is assigned a serial number which is stamped on a nameplate (key 54, not
shown) attached to the torque tube arm. This same number also appears on the controller/ transmitter nameplate
when a complete controller/ transmitter‐sensor unit is shipped from the factory.
WARNING
Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Automation Solutions should
not, under any circumstances, be used in any Fisher instrument. Use of components not supplied by Emerson may void
your warranty, might adversely affect the performance of the instrument, and could cause personal injury or property
damage.
249VS Sensor
July 2018
11
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