Instruction Manual
D200160X012
4195K Controllers
July 2018
91
5. Loosen the screw on link 5 (key 88) and adjust the link length so that the pivot arms of the short pivot clevis
assembly (key 89) and the long pivot clevis assembly (key 78) are parallel. Tighten the screw.
6. Complete the maintenance calibration by performing the zero and span adjustments in the following procedure.
Capsular Element Controller Zero and Span Adjustment
Note
For routine zero and span calibration, refer to the appropriate procedures in Section 3, 4, or 5. Use the following maintenance zero
and span adjustment procedure only if difficulty is encountered with the routine procedure or if nonlinearity occurs.
Provide a means of applying process pressure to the sensing element and a regulated supply pressure adjusted to the
normal operating pressure (see table 1‐6). Plug the controller output or connect it to a gauge. Monitoring the
controller output is not necessary. However, the flapper should not contact the nozzle at any time while performing
this procedure. If it does, adjust flapper screw 2 (the one nearest the nozzle) to provide clearance. Refer to figure 6‐19
for the adjustment locations. Refer to figure 7‐1 for the key number locations.
Note
Any adjustment of the process pointer span adjustment screw requires readjustment of the process pointer zero adjustment
screw.
1. Remove the two machine screws (key 6) and lift off the proportional band indicator cover (key 36).
2. Set the proportional band between DIRECT and REVERSE.
3. Adjust the reset (4195KB and KC controllers only) to 0.01 minutes per repeat.
4. Adjust the rate (4195KC controllers only) to OFF.
5. For a controller with manual set point, move the set point indicator to the mid‐scale mark on the process scale. For
a controller with remote set point, adjust the remote set point pressure until the set point indicator is at the
mid‐scale mark on the process scale.
6. Apply process pressure equal to the mid‐scale value of the process scale span.
adjustment locking screw and adjust the zero adjustment screw to align the process pointer with the pointer
subassembly. Tighten the zero adjustment locking screw.
8. The process pointer should indicate mid‐scale
±
3 percent of the process scale span. If not, loosen the screw on
either link 1 or link 5 and adjust the length so that the process pointer points to the mid‐scale mark on the process
scale. Tighten the screw.
9. Apply process pressure equal to the process scale lower limit.
10. The process pointer should indicate the process scale lower limit. If not, loosen the zero adjustment locking screw
and adjust the zero adjustment screw until the process pointer indicates the lower limit. Tighten the zero
adjustment locking screw.
11. Apply process pressure equal to the process scale upper limit.
12. The process pointer should indicate the process scale upper limit. If not, proceed as follows:
a. If the pointer indicates less than the process scale upper limit, rotate the pointer span adjustment clockwise to
increase the span. Adjust the span adjustment screw to correct for one‐half of the error.
