4194A, B, and C Series
5–18
Figure 5-14. Process Pointer Alignment
ALIGNED
W3443-1 / IL
MISALIGNED
W3475-1 / IL
FINE ZERO
ADJUSTMENT
ZERO ADJUSTMENT
LOCKING SCREW
8. Connect link 2 to the flapper assembly.
9. Remove the tape from the process pointer and re-
connect link 1 to the hole in the short pivot clevis as-
sembly noted in step 6.
10. Perform the controller calibration procedures and,
if necessary, the appropriate remote set point calibra-
tion procedure in section 3 or 4.
Replacing Link 3
1. Remove the two screws (key 6), and lift off the pro-
portional 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 fig-
ure 5-13.
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 fig-
ure 5-3.
6. Move the set point indicator to the mid-scale mark
on the process scale.
7. Apply process differential 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 RE-
VERSE. Turn flapper leveling screw 1 (the screw near-
est the nozzle) until the nozzle just touches the flap-
per.
10. Flapper leveling screws 1 and 3 should protrude
the same distance from the clinch nuts. A clinch nut is
shown in figure 5-15.
11. If leveling screw 1 protrudes further than leveling
screw 3, turn the link 3 adjusting screw counterclock-
wise. If leveling screw 3 protrudes further than leveling
screw 1, turn the link 3 adjusting screw clockwise.
12. Repeat steps 8 through 11 until leveling screws 1
and 3 protrude an equal distance from the clinch nuts.
13. Perform the controller calibration procedures and,
if necessary, the appropriate remote set point calibra-
tion procedure in section 3 or 4.
Replacing Link 4
1. Remove the two screws (key 6), and lift off the pro-
portional band indicator cover (key 36).
