Emerson Fisher 249VS Instruction Manual - Page 10

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Cageless 249VS Sensor

W0654-2

REMOVAL OR INSTALLATION OF POSITIONING PLATE

6. Install a new tube end gasket and insert the

torque tube assembly into the torque tube arm as

shown in figure 9. Rotate the torque tube assembly

until its socket mates with the driver member on the

displacer rod assembly and so the outer tube flange

rests against the gasket. With a thumb on the upper

portion of the positioning plate and a screwdriver in

the slots as shown in figure 9, rotate the plate and

press the lug on the plate into the hole in the torque

tube arm.

7. Install the retaining flange and secure it with four

nuts (key 13), being sure to tighten all nuts evenly.

8. 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 Arm and

Changing the Mounting Position

Looseness of the driver bearing (key3), wear on its

knife-edged surface, or a bent, worn, or corroded

displacer rod assembly (key 14) may impair

performance. Be especially sure to check the ball on

the displacer rod.

CAUTION

Support the sensor assembly to avoid

damage to the displacer, displacer

W0145-1*/IL

Figure 9. Torque Tube and Displacer Rod Assemblies

DISPLACER ROD

ASSEMBLY

TORQUE TUBE

OUTER TUBE END

POSITIONING PLATE

DRIER BEARING

EXPLODED VIEW OF TORQUE TUBE AND DISPLACER ROD ASSEMBLY

stem, displacer rod assembly, and

associated parts.

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.

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

Instruction Manual

Form 5831

November 2007

ROTARY SHAFT

Note