Emerson Fisher 249VS Gebruiksaanwijzing - Pagina 8

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Cageless 249VS Sensor

BJ8646-A/DOC

Figure 8. Type 249VS Travel Stop Plate Positions

If separating the displacer and

displacer stem during the removal of

the sensor assembly from the process

vessel, remove the cotter spring (key

8) and separate the displacer/displacer

stem from the sensor assembly.

Be careful not to let the displacer slip

and drop into the bottom of the

process vessel, as displacer damage

could result.

1. Carefully remove the torque tube arm.

2. On the Type 249VS, the travel stop plate can be

located in one of four positions, as shown in figure 8.

With a standard or thin-walled torque tube and with

the displacer hanging free on the displacer rod, the

rod should not touch the plate. If it does, remove the

plate and choose a position where the rod will not

touch the plate.

3. Follow the procedure for replacing the displacer,

displacer rod assembly, cotter spring, stem end

piece, and displacer spud as necessary.

Replacing the Displacer, Cotter Spring,

Stem End Piece, and Displacer Spud

The cotter spring (key 8), the ball on the displacer

rod/driver assembly (key 14), and the stem end

piece or displacer stem connector (key 18) may be

either too worn for a secure connection or so

clogged or corroded that the displacer does not pivot

properly. Replace these parts, as necessary.

CAUTION

If the displacer is to be disconnected

from the displacer rod/driver assembly

before being removed from the

process vessel, provide a suitable

means of supporting the displacer to

prevent it from dropping into the

process vessel and being damaged.

1. After following the proper procedure to remove

the torque tube arm assembly and the displacer from

the process vessel, move the sensor assembly to a

suitable maintenance area. Support the assembly to

avoid damage to the displacer, displacer stem,

displacer rod assembly, and associated parts.

2. Reach the cotter spring, displacer spud, ball end

of the displacer rod/driver assembly, stem end piece,

or displacer stem connector as follows:

Remove the process vessel bolting and pull out the

torque tube arm assembly (key 1). The inside of the

process vessel wall will cause the displacer to swing

up so it can be pulled out through the vessel

opening.

3. Remove the cotter spring to free the displacer or

stem end piece from the ball end of the displacer

rod/driver assembly. Lift the displacer or stem end

piece from the ball.

4. Replace worn or damaged parts as necessary.

Return the displacer or stem end piece to the

displacer rod/driver assembly. Install the cotter

spring.

5. Install the controller/transmitter. Calibrate the

controller/transmitter following the procedures given

in the controller/transmitter instruction manual.

Replacing the Displacer Rod/Driver

Assembly

The ball on the displacer rod/driver assembly (key

14) may be either too worn for a secure connection

or so corroded that the displacer does not pivot

Instruction Manual

Form 5831

November 2007