Instruction Manual
D200100X012
249 Cageless Sensors
December 2012
8
Figure 4. Torque Tube and Displacer Rod Assemblies
W0654‐1
REMOVAL OR INSTALLATION OF POSITIONING PLATE
EXPLODED VIEW OF TORQUE TUBE AND DISPLACER ROD ASSEMBLY
DISPLACER ROD
ASSEMBLY
ROTARY
SHAFT
TORQUE TUBE
OUTER TUBE END
POSITIONING PLATE
DRIVER BEARING
W0145‐2
GASKET
6. Using the proper tool, loosen and then remove the upper bearing driver bolt (key 5). Lift the displacer rod/driver
assembly from the knife edge of the driver bearing (key 4).
7. Visually inspect the bearing driver for corrosion or wear. If replacement is necessary, remove the bearing driver by
removing the lower bearing driver bolt. Install a new bearing driver and the lower bearing driver bolt.
8. Install the new displacer rod/driver assembly on the knife edge of the bearing driver. Install the upper bearing driver
bolt (key 5), but do not tighten.
9. Insert new tube end gasket into recess in torque tube arm.
10. Insert the torque tube assembly and rotate until its socket mates with the displacer rod assembly and so that the
outer tube flange rests against the gasket.
11. With a thumb on the upper portion of the positioning plate and a screwdriver in the slots as shown in figure 4,
rotate the plate and press the lug on the plate into the hole in the torque tube arm (this will preload the torque
tube).
12. Install the retaining flange and secure it with four nuts (key 18), being sure to tighten all nuts evenly.
13. Tighten the upper bearing driver bolt (key 5). It will be necessary to put slight pressure on the displacer rod/driver
assembly to access the upper bearing driver bolt.
14. Install the sensor head and controller/transmitter. Calibrate the controller/transmitter following the procedures
given in the controller/transmitter instruction manual.
Replacing the Torque Tube
Corrosion or leakage through the outer end of the torque tube is evidence of deterioration in the torque tube
assembly (key 9) or torque tube end gasket (key 14). Erratic or nonexistent rotary shaft output may occur if the socket
on the inner end of the torque tube assembly does not engage the bearing end of the displacer rod assembly (key 7).
1. After following the proper procedure to remove the sensor head and the displacer from the process vessel, move
the sensor assembly to a suitable maintenance area.
CAUTION
Support the sensor assembly to avoid damage to the displacer, displacer stem, displacer rod assembly, and associated
parts.
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