Fisher 4195 KB Series Instruction Manual page 59

4195KA, KB, and KC Series
process pointer to the process scale upper limit and
tape the process pointer in this position.
7. Adjust the length of link 2 (by turning the adjusting
screw clockwise to increase the length or counter-
clockwise to decrease the length) so that the pin on
the end of the link is approximately one-half of its di-
ameter short of aligning with the hole in the flapper
assembly as shown in figure 5–11. This adjustment
provides the proper tension on the link to eliminate lost
motion.
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 Capsular Element Controller 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 5–21.
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 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
nearest the nozzle) until the nozzle just touches the
flapper.
10. Flapper leveling screws 1 and 3 should protrude
the same distance from the clinch nuts. A clinch nut is
shown in figure 5–16.
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.
5–26
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 Capsular Element Controller Link 4
1. Remove the two screws (key 6), and lift off the pro-
portional band indicator cover (key 36).
2. Disconnect link 4 from the bellows bracket (key 31)
and the flapper assembly (key 11).
3. Connect the replacement link to the flapper assem-
bly so that the two adjusting screws on the link are
nearest to the bellows bracket (key 31) and so that the
screw heads are facing the bottom of the controller as
shown in figure 5–21.
4. For controllers with reset (4195KB Series) or reset
and rate adjustments (4195KC Series), turn the reset
adjustment to the CLOSED (4195KB) or OFF
(4195KC) position. Turn the rate adjustment (4195KC
Series) to the OFF position.
The controller output must be 0 psig (0 bar). To be
sure the controller output is at 0 psig (0 bar), remove
supply pressure, set the reset adjustment to 0.01 min-
utes per repeat and wait 30 seconds; then, turn the
reset adjustment to the CLOSED (4195KB) or OFF
(4195KC) position.
5. Adjust the proportional band to 5 percent RE-
VERSE and move the set point indicator to the pro-
cess scale upper limit.
6. Disconnect link 1 from the pivot arm. Tape the pro-
cess pointer to the process scale lower limit (the last
mark on the left side of the scale).
7. Apply the correct supply pressure to the controller.
The output of the controller should be within 2 psig
(0.14 bar) of supply pressure. If not, adjust flapper lev-
eling screw 1 (the screw nearest the nozzle) until the
output is within 2 psig (0.14 bar) of supply pressure.
8. Loosen the two adjusting screws on link 4. Connect
the free end of the link to the bellows bracket and al-
low the link to find its free length.
9. Tighten the two adjusting screws on the link.
10. Raise link 4 out of the hole in the bellows bracket
(key 31) and ensure that it drops back into the hole
under its own weight. If not, repeat steps 8 and 9.
11. For a controller with reset, adjust the reset adjust-
ment to 0.01 minutes per repeat. The rate adjustment
(4195KC) should remain in the OFF position.
12. The controller output should be within 2 psig (0.14
bar) of the supply pressure. If not, adjust flapper level-
ing screw 1 (the screw nearest the nozzle) until the
output is within 2 psig (0.14 bar) of supply pressure.
13. Remove the tape from the process pointer and
connect link 1 to the pivot arm.