Replacing The Anti-Reset Windup (Suffix Letter F) Differential Relief Valve; Replacing The Anti-Reset Windup (Suffix Letter F) Relief Valve Tubing Assembly; Bourdon Tube Controller Maintenance And Calibration; Replacing The Bourdon Tube - Fisher 4195 KB Series Instruction Manual

4195KA, KB, and KC Series
11. Position the gasket (key 5) on the rate/reset valve
assembly. Hold the gasket in place while installing the
rate tubing assembly (key 137) on the valve assembly
using the two machine screws (key 71).
12. Insert the reset tubing assembly (key 43) into the
rate/reset valve assembly and tighten the nut.
13. Insert the proportional tubing assembly (key 40)
into the rate/reset valve assembly and tighten the nut.
14. For controllers with anti-reset windup (suffix letter
F), insert the relief tubing assembly (key 44) into the
rate/reset valve assembly and tighten the nut.
15. Set the reset to 0.01 minutes per repeat and the
rate to OFF.
16. Apply the proper supply pressure to the controller
and check for leaks. Remove the supply pressure.
17. Position the controller assembly in the case and
start, but do not tighten the nine mounting screws.
Slide the controller assembly down to assure an O-
ring seal at the pressure connections along the bottom
of the case. Hold the controller assembly in place
while tightening the nine mounting screws.
18. Perform the controller calibration procedures and,
if necessary, the appropriate remote set point calibra-
tion procedure in section 4.
19. Mount the controller as described in the Installa-
tion section.
20. Connect the external piping to the controller.
Replacing the Anti-Reset Windup (suffix
letter F) Differential Relief Valve
Refer to the 4195KB or 4195KC Series suffix letter F
portion of figure 5–24 for key number locations.
1. Loosen the two mounting screws in the differential
relief valve (key 55) and remove the relief valve.
2. Inspect the O-rings on the replacement relief valve.
Apply a suitable lubricant to the O-rings.
3. Install the replacement relief valve into the control-
ler frame, keeping in mind that:
When the arrow points up, the valve relieves with
decreasing output pressure.
When the arrow points down, the valve relieves
with increasing output pressure.
4. Tighten the two screws that hold the relief valve to
the frame.
5. The relief valve differential pressure is factory-set
at 5 psig (0.3 bar). Maximum differential pressure is 7
psig (0.5 bar); minimum differential pressure is 2 psig
(0.14 bar). If a different differential pressure setting is
5–16
desired, refer to the anti-reset windup valve calibration
procedure in section 4.
Replacing the Anti-Reset Windup (suffix
letter F) Relief Valve Tubing Assembly
Refer to the 4195KB or 4195KC Series suffix letter F
portion of figure 5–24 for key number locations.
1. Remove the controller assembly from the case by
performing steps 1 through 3 of the case and cover
replacement procedure.
2. Loosen the nuts at both ends of the relief valve tub-
ing (key 44) and remove the tubing.
3. Install the replacement relief valve tubing, and
tighten the tubing nuts at both ends.
4. Apply the proper supply pressure to the controller,
cap the nozzle and check for leaks. Remove the sup-
ply pressure.
5. Position the controller assembly in the case and
start, but do not tighten the nine mounting screws.
Slide the controller assembly down to assure an O-
ring seal at the pressure connections along the bottom
of the case. Hold the controller assembly in place
while tightening the nine mounting screws.
6. Perform the controller calibration procedures and, if
necessary, the appropriate remote set point calibration
procedure in section 4.
7. Mount the controller as described in the Installation
section.
8. Connect the external piping to the controller.
Bourdon Tube Controller Maintenance
and Calibration

Replacing the Bourdon Tube

Refer to figure 5–25 for key number locations. Refer to
figure 5–13 for a detailed photograph of the Bourdon
tube controller link locations and adjustments.
1. Disconnect link 1 (key 382) from the Bourdon tube
(key 383) as shown in figure 5–14.
2. Unscrew the tubing nut from the Bourdon tube to
allow for Bourdon tube removal.
3. Remove the self-tapping screws (key 384) that fas-
ten the Bourdon tube (key 383) to the indicator assem-
bly (key 101).
4. With care, separate the Bourdon tube (key 383)
from the process tubing assembly (key 381) and lift
out the Bourdon tube.
5. Carefully place the replacement Bourdon tube in
position and start the two self-tapping screws. Con-
nect the process tubing assembly then tighten the self-
tapping screws to secure the Bourdon tube.