Instruction Manual
D200158X012
4194S Controllers
July 2018
47
8. Refer to the Maintenance Calibration procedure.
Drive Flexure
1. Disconnect the flexure (key 79) from the drive bracket (key 121) and from the adjustment arm of pivot assembly A.
Remove the screws and washer (key 12 and 13); remove the flexure.
2. Set remote set point pressure at 50 percent of input span.
CAUTION
Avoid bending or kinking the drive flexure. Bending or kinking the drive flexure can result in product damage, as well as
impaired performance.
3. Connect the new flexure making sure it stays straight and horizontal. Before tightening the drive flexure, set pivot A
in the middle of the bushing end play. Tighten down the drive flexure to hold the pivot in that position. Do not kink
or twist the flexure when tightening the screws.
4. Decrease the remote set point pressure to 0 psig.
5. Perform the Maintenance Calibration procedure.
Tubing
1. Decrease the remote set point pressure to 0 psig.
2. Disconnect the pressure connection (key 93) into the pedestal assembly (key 105) and the connection to the case
exterior at the top of the case.
3. Remove the tubing.
4. Install the replacement tubing, and reconnect the two pressure connections.
5. Apply full remote set point pressure, and check for leaks.
Remote Set Point Capsular Element Assembly
Note
Remove the supply pressure gauge before attempting to remove the capsular element assembly.
1. Decrease the remote set point pressure to 0 psig.
2. Remove the pressure connection (key 93) at the pedestal assembly (key 105).
3. Disconnect link B (key 126) from the pivot hole on set point indicator assembly.
4. Remove the three mounting screws that attach the capsular element assembly to the process/set point indicator
assembly. See figure 3-2 for location of screws.
CAUTION
In the following step, do not lift out the capsular element assembly by holding the capsule or the linkages. These parts are
easily damaged.