Replacing The Process Tubing; Replacing Capsular Element Controller Links - Emerson Fisher KC Series Instruction Manual

Instruction Manual
Form 5207
April 2007
LINK 5
W4769 / IL
See figure 6-20. The adjustment arm of
the long pivot clevis assembly is
connected to a shaft that turns on
bushings at each end of the shaft. In
the next step, position the shaft so
that both bushings ''float'' inside the
bearings and do not rest against the
end of either bearing.
5. Before tightening the drive flexure cap screws
(key 12), hold the pivot shaft in the middle of the
bushing end play. Be sure neither bushing is resting
against the inside end of either bearing. Tighten the
drive flexure cap screws to hold the pivot shaft in
position. Take care not to kink or twist the flexure
when tightening the screws.
6. Perform the capsular element maintenance
calibration procedure in this section. Perform the
controller calibration procedures and, if necessary,
the appropriate remote set point calibration
procedure in Section 3, 4, or 5.

Replacing the Process Tubing

1. Remove process pressure from the controller.
2. Using two open-end 5/16-inch wrenches,
disconnect the process tubing (keys 91 or 92) at the
pedestal assembly (key 81) and at the bottom of the
controller case. Remove the tubing.
3. Install the replacement tubing, and tighten all
connections. Check for leaks.
4. Perform the controller calibration procedures and,
if necessary, the appropriate remote set point
calibration procedure in Section 3, 4, or 5.
4195KA, KB, KC, and KS Controllers
LINK 1
LINEARITY LINK 2
ADJUSTMENT
SCREW
Figure 6-21. Capsular Element Controller Link Locations and Adjustments
Note
LINK 4
LINK 4 ADJUSTMENT
LINK 3 ADJUSTMENT
LINK 2 ADJUSTMENT
Replacing Capsular Element Controller
Links
Refer to the Maintenance WARNING
on page 6-1.
This section describes the separate replacement of
five links in the controller. Figure 6-21 shows the
location of each link. To clarify the location of each
link, the links are numbered as follows:
D Link 1 connects the short pivot clevis assembly
and the process pointer
D Link 2 connects the process pointer and the
flapper assembly (key 11)
D Link 3 connects the set point indicator and the
set point beam assembly (key 23)
D Link 4 (key 65) connects the flapper assembly
and the bellows bracket (key 31)
D Link 5 (key 88 in figure 7-5) connects the short
pivot clevis assembly (key 89) and the long pivot
clevis assembly (key 78).
LINK 3
WARNING
6-29