Bourdon Tube Controller Maintenance And Calibration; Replacing The Bourdon Tube - Emerson Fisher 4195KA Instruction Manual

Instruction Manual
D200160X012
5. Position the controller assembly in the case and start, but do not tighten the nine mounting screws. Slide the
controller assembly down to assure an O‐ring seal at the pressure connections along the bottom of the case. Hold
the controller assembly in place while tightening the nine mounting screws.
6. Perform the controller calibration procedures and, if necessary, the appropriate remote set point calibration
procedure in Section 4.
7. Mount the controller as described in the Installation section.
8. Connect the external piping to the controller.

Bourdon Tube Controller Maintenance and Calibration

Replacing the Bourdon Tube

WARNING
Refer to the Maintenance WARNING on page 51.
Refer to figure 7‐2 for key number locations. Refer to figure 6‐13 for a detailed photograph of the Bourdon tube
controller link locations and adjustments.
1. Disconnect link 1 (key 382) from the Bourdon tube (key 383) as shown in figure 6‐14.
2. Unscrew the tubing nut from the Bourdon tube to allow for Bourdon tube removal.
3. Remove the self‐tapping screws (key 384) that fasten the Bourdon tube (key 383) to the indicator assembly
(key 101).
4. With care, separate the Bourdon tube (key 383) from the process tubing assembly (key 381) and lift out the
Bourdon tube.
5. Carefully place the replacement Bourdon tube in position and start the two self‐tapping screws. Connect the
process tubing assembly then tighten the self‐tapping screws to secure the Bourdon tube.
6. Apply process pressure equal to the process scale upper limit and check for leaks. Remove process pressure.
7. Connect link 1 to the Bourdon tube.
8. With the process pressure at 0 percent, the process pointer should indicate 0 percent on the process scale. If not,
loosen the two screws on link 1 and adjust the length of link 1 to position the process pointer at 0 percent. Tighten
the screws.
9. Perform the controller calibration procedures and, if necessary, the appropriate remote set point calibration
procedure in Section 3, 4, or 5.
4195K Controllers
July 2018
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