Instruction Manual
D200156X012
4194HA, HB, HC Controllers
July 2018
49
7. Adjust the length of link 2 by turning the adjusting screw (see figure 5‐7) clockwise to increase length, or
counterclockwise to decrease length so the pin on the end of the link is approximately one‐half of its diameter short
of engaging with the hole in the flapper assembly as shown in figure 5‐9. This adjustment provides the proper
tension on the link to eliminate lost motion.
8. Remove the tape from the process indicator.
9. Connect link 2 to the input feedback beam assembly.
10. Connect link 1 to the drive arm.
11. Perform the controller calibration procedure and, if necessary, the appropriate remote set point calibration
procedure in Section 3 or 4.
Figure 5‐7. Link Number 2 Adjustment
LEVELING
SCREW
NUMBER 1
CLINCH NUT
FLAPPER LEVELING
SCREW 3
CONNECTING
TAB ON INPUT
FEEDBACK BEAM
ASSEMBLY
1/2 OF PIN
DIAMETER
W3451
W4191
Link 3
Note
Before performing the following link 3 maintenance steps, disconnect supply pressure from the controller. The link 3 procedure
provides a non‐pressurized alignment of the flapper before calibration.
The following steps provide initial alignment between link 3 and the flapper.
1. Remove the two screws (key 6) and lift off the proportional band indicator cover (key 36).
2. Note where the link is connected. Disconnect link 3 from set point adjustment assembly and the set point beam
assembly (key 23).
3. Adjust the replacement link to the same length as the current link.
4. Install the replacement link with the screw head toward the set point beam assembly as shown in figure 5‐8 and in
the position as noted in step 2.
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