4195KA, KB, KC, and KS Controllers
Instruction Manual
Form 5207
April 2007
6-11
24. Disconnect link 1 from the input element, noting
the hole from which it is removed, for capsular input
elements, and tape the process pointer to the lower
limit on the process scale. The output pressure may
be anywhere between 0.2 to 1.0 bar (3 to 15 psig)
for a 0.2 to 1.0 bar (3 to 15 psig) output signal range
or between 0.4 to 2.0 bar (6 to 30 psig) for a 0.4 to
2.0 bar (6 to 30 psig) output signal range. If the
output is not within the specified range, adjust the
flapper leveling screw nearest the nozzle until the
output is within the range specified. Record the
controller output pressure.
25. Adjust the set point to the upper limit on the
process scale.
26. Remove the tape and move the process pointer
until the controller output equals the pressure
recorded in step 24. Note the process pressure
indication.
27. The process pressure indication should be
within ±2 percent of the upper limit on the process
scale.
If the process pressure indication in step 26 is
greater than the upper limit of the process scale by 2
percent, loosen the shoe adjustment screws (key
30), shown in figure 6-3, and move the set point
beam shoe (key 29) slightly away from the center of
the flapper assembly.
If the process pressure indication in step 26 is less
than the upper limit of the process scale by 2
percent, loosen the shoe adjustment screws (key
30), shown in figure 6-3, and move the set point
beam shoe (key 29) slightly toward the center of the
flapper assembly.
28. Repeat steps 23 through 27 until the error is
less than 2 percent of process scale span at the
upper limit of the process scale.
29. Remove the tape from the process pointer and
reconnect link 1 to the input element. If the controller
has a capsular input element, be sure to reconnect
link 1 in the same hole noted in step 24.
30. 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.
31. Perform the controller calibration procedures
and, if necessary, the appropriate remote set point
calibration procedure in Section 3, 4, or 5.
32. Mount the controller as described in the
Installation section.
33. Connect the external piping to the controller.
Replacing the Flapper Assembly and
Flapper Flexure Pivot Assembly
WARNING
Refer to the Maintenance WARNING
on page 6-1.
1. Remove the controller assembly from the case
by performing steps 1 through 3 of the case and
cover replacement procedure.
2. Remove the two screws (key 6) and lift off the
proportional band indicator cover (key 36).
3. Disconnect link 3 from the set point beam shoe,
part of the set point beam assembly (key 23). Refer
to figure 6-3 for the link location.
4. Remove the set point beam bias spring (key 28).
Refer to figure 6-3 for the spring location.
5. Remove the screw and washer (keys 19 and 20)
that hold the adjustable set point pivot assembly
(key 17) to the frame.
6. Remove the adjustable set point pivot assembly
(key 17).
7. Unscrew the nut that secures the relay nozzle
tubing assembly (key 18) to the frame manifold (key
135). Refer to figure 6-3.
8. While holding the proportional band adjustment
knob, remove the screw and washer (keys 19
and 20) that hold the relay nozzle tubing assembly
(key 18) to the frame.
9. Remove the proportional band adjustment knob,
relay nozzle tubing assembly, and the set point
beam assembly from the controller.
10. Disconnect link 2 from the flapper assembly
(key 11). Refer to figure 6-7 for the link location.
11. Disconnect link 4 from the bellows bracket
(key 31). Refer to figure 6-7 for the link location.
12. Remove the two cap screws (key 12) from the
flexure pivot assembly (key 9). See figure 6-8 for
screw location.
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