Instruction Manual
D200160X012
4195K Controllers
July 2018
82
15. Apply process pressure equal to the mid‐scale value of the process scale span. The process pointer should indicate
mid‐scale
±
2 percent of the process scale span. If the process pointer error is
±
2 percent or less, proceed to step 17.
If the process pointer error is greater than
±
2 percent, loosen the two Bourdon tube mounting screws (key 384,
17. Adjust the process pointer to within
±
1 percent of the mid‐scale mark by loosening the zero adjustment locking
screw and adjusting the zero adjustment screw. Tighten the zero adjustment locking screw. This distributes the
error over the entire process scale and keeps all points within
±
1 percent of the process scale span.
18. Adjust the process pressure to the lower and upper limits of the process scale span to make sure the process
pointer is still within
±
1 percent of the lower and upper scale limits.
19. Perform the flapper alignment procedure and, if necessary, the appropriate remote set point calibration procedure
Capsular Element Controller Maintenance and Calibration
Replacing the Capsular Element Assembly
WARNING
Refer to the Maintenance WARNING on page 51.
Refer to figure 7‐5 for key number locations, unless noted otherwise.
1. Remove process pressure from the controller.
2. Note the hole location and disconnect link 1 (key 90) from the process pointer.
3. Disconnect the process pressure connection union (key 93) from the pedestal assembly (key 81). Use two 5/16‐inch
hex wrenches.
assembly (key 101 in figure 7‐3).
CAUTION
In the following step, do not lift out the capsular element assembly by holding the capsular element or linkages. These
parts may be damaged.
5. Lift out the capsular element assembly by holding the tie bar (key 97), mounting plate (key 77), travel stop (key 83),
or pedestal assembly (key 81).
6. Position the replacement capsular element assembly over the mounting screw holes. Install and tighten the
mounting screws (key 127 in figure 7‐3).
7. Reconnect link 1 (key 90) to the process pointer in the same hole noted in step 2.
8. Reconnect the process pressure connection union (key 93).
9. Apply process pressure to the controller and check for leaks.
10. Perform the capsular element maintenance calibration procedure in this section. Perform the controller calibration