Instruction Manual
D200160X012
4195K Controllers
July 2018
76
6. Disconnect link 1 from the Bourdon tube and manually position the process pointer to the process scale upper limit.
Tape the pointer in this position.
7. Adjust the length of link 2 (by turning the adjusting screw clockwise to increase the length or counterclockwise to
decrease the length) so that the pin on the end of the link is approximately one‐half of its diameter short of aligning
with the hole in the flapper assembly as shown in figure 6‐11. This adjustment provides the proper tension on the
link to eliminate lost motion.
8. Connect link 2 to the flapper assembly.
9. Remove the tape from the process pointer and reconnect link 1 to the Bourdon tube.
10. Perform the controller calibration procedures and, if necessary, the appropriate remote set point calibration
procedure in Section 3, 4, or 5.
Replacing Bourdon Tube Controller Link 3
1. Remove the two screws (key 6), and lift off the proportional band indicator cover (key 36).
2. Disconnect link 3 from the set point indicator and the set point beam assembly (key 23).
3. Adjust the replacement link to the same length as the link removed.
4. Install the replacement link with the screw head toward the set point beam assembly as shown in figure 6‐13.
5. Check that the set point beam bias spring (key 28) is correctly located in the frame bore and the spring seat on the
set point beam assembly as shown in figure 6‐3.
6. Move the set point indicator to the mid‐scale mark on the process scale.
7. Apply process pressure to position the process pointer at the mid‐scale mark on the process scale.
8. Adjust the proportional band to 5 percent DIRECT. Turn flapper leveling screw 3 (the screw nearest the nozzle) until
the nozzle just touches the flapper.
9. Adjust the proportional band to 5 percent REVERSE. Turn flapper leveling screw 1 (the screw nearest the nozzle)
until the nozzle just touches the flapper.
10. Flapper leveling screws 1 and 3 should protrude the same distance from the clinch nuts. A clinch nut is shown in
Figure 6‐16. Flapper leveling Screw and Clinch Nut
W4191‐1
FLAPPER LEVELING
SCREW
CLINCH
NUT
11. If leveling screw 1 protrudes further than leveling screw 3, turn the link 3 adjusting screw counterclockwise. If
leveling screw 3 protrudes further than leveling screw 1, turn the link 3 adjusting screw clockwise.