Remote Set Point (Suffix Letter M) Maintenance; Replacing The Remote Set Point Assembly; Replacing Remote Set Point Assembly Parts; Replacing Pivot Assembly A (Key 114) - Fisher 4195 KB Series Instruction Manual

4195KA, KB, and KC Series
both ends of link 5, move the link down one set of
holes, and return to step 6.
b. If the span is long (process pointer indication is
greater than the process scale upper limit), discon-
nect both ends of link 5, move the link up one set of
holes, and return to step 6.
16. Apply process pressure equal to the mid-scale
value of the process scale span. The process pointer
should indicate mid-scale 2 percent of the scale
span. If the process pointer error is 2 percent or less,
proceed to step 17. If the process pointer error ex-
ceeds 2 percent, the linearity can be improved with
the linearity adjustment. See figure 5–22 for the linear-
ity adjustment screw location.
a. If the error at mid-scale is high (process pointer
is to the right side of the mid-scale mark), loosen
the linearity adjustment screw and slide it upward in
the curved slot. Tighten the screw and return to
step 6.
b. If the error at mid-scale is low (process pointer
is to the left side of the mid-scale mark), loosen the
linearity adjustment screw and slide it downward in
the curved slot. Tighten the screw and return to
step 6.
17. Adjust the process pointer to within 1 percent of
the mid-scale mark by loosening the zero adjustment
locking screw and adjusting the zero adjustment
screw. Tighten the zero adjustment locking screw.
This distributes the error over the entire process scale
and keeps all points within 1 percent of the process
scale span.
18. Adjust the process pressure to the lower and up-
per limits of the scale span to make sure the process
pointer is still within 1 percent of the lower and upper
scale limits.
19. Perform the flapper alignment procedure and, if
necessary, the appropriate remote set point calibration
procedure in section 3 or 4.
Remote Set Point (suffix letter M)
Maintenance

Replacing the Remote Set Point Assembly

Use the following procedures to replace the remote set
point assembly. Figure 5–23 shows the part locations.
Refer to figure 5–30 for key number locations.
5–30
Remove the supply pressure gauge be-
fore attempting to remove the capsular
element assembly.
1. Decrease the remote set point pressure to 0 psig.
2. Remove the supply pressure gauge.
3. Remove the pressure connection (key 93) at the
pedestal assembly (key 105). Use two 5/16 inch
wrenches.
4. Disconnect link B (key 126) from the connection
hole on the set point indicator.
5. Remove the three mounting screws (keys 120 and
140) that attach the remote set point assembly to the
process/set point indicator assembly. Figure 5–23
shows the mounting screw locations.
CAUTION
In the following step, do not lift out the
remote set point assembly by holding
the capsular element or linkages. These
parts may be damaged.
6. Lift out the remote set point assembly by holding
the tie bar (key 106), mounting plate (key 111), travel
stop (key 83), or pedestal assembly (key 105).
7. Align the replacement assembly with the mounting
screw holes. Replace the mounting screws.
8. Reconnect the remote set point pressure connec-
tion union (key 93). Apply full remote set point pres-
sure and check for leaks.
9. Connect link B (key 126) to the connecting hole on
the set point indicator.
10. Replace the supply pressure gauge.
11. Perform the remote set point maintenance calibra-
tion procedure. Perform the appropriate process indi-
cator zero and span calibration and flapper alignment-
procedure in section 3 or 4.
Replacing Remote Set Point Assembly
Parts
Figure 5–23 shows the parts and adjustment locations.
Refer to figure 5–30 for key number locations.

Replacing Pivot Assembly A (Key 114)

1. Decrease the remote set point pressure to 0 psig.
2. Remove the two screws (key 103) and remove the
tie bar (key 106).
3. Note where link A is connected. Disconnect link A
(key 116) from the lever arm on pivot assembly A (key
114).
Note