Instruction Manual
D200158X012
4194S Controllers
July 2018
34
Figure 4-10. Link 2 Number Adjustment
W3451
W3476
31. Install the pivot of the set point pivot assembly (key 17) in the hole in the set point beam.
32. Install washer (key 20) on screw (key 19).
33. Install the set point beam bias spring (key 28) into the frame (key 3) bore and onto the spring seat on the set point
beam assembly (key 23).
34. Attach link number 3 to the set point beam assembly.
35. Apply proper supply pressure to the controller, and check for leaks.
36. Adjust the proportional band to 5 percent direct action, and adjust the set point to the maximum value on the
process scale. Controller output should be 0 psig. Remove supply pressure from the controller.
37. With zero pressure in both feedback bellows, loosen the two adjusting screws on link 4, and connect the link to the
bellows bracket assembly, allowing the link to find its free length.
38. Tighten the two adjusting screws.
39. If the position of the set point beam shoe (key 29) was changed during this procedure, perform steps 32 through 52
in the Replacing Proportional Band Knob, Nozzle Pivot, and Set Point Beam Assembly procedure. Otherwise,
perform step 40.
40. Install the controller assembly in the case. Slide the controller frame down to assure an O‐ring seal at the pressure
connections. Hold the frame in place.
41. Install and tighten the nine screws that hold the controller assembly in the case.
42. Refer to the Flapper Alignment procedures.
43. Replace the proportional band cover (key 36), and replace the two screws (key 6).
Positive Feedback Bellows
Note
The following procedure requires that the controller be removed from the case. Perform steps 1 through 3 of the replacing case
and cover procedure. Both bellows need not be removed if only one requires replacement.
