4150K and 4160K Series
22
5. Disconnect the link (key 71M) and bearing (key
71L) from the beam. Be careful to avoid losing the
bearing.
6. Loosen the nuts that secure the bellows assembly
(key 71), and remove this assembly from the bellows
yoke (key 70).
7. For a gauge-pressure sensing element (only one
bellows in the assembly), install the proper bellows
spring (key 80) into the bellows assembly if the input
signal range is being changed. See the parts list for
the correct part number.
8. Install the new bellows assembly into the bellows
yoke.
9. Attach the link and bearing to the bellows assem-
bly. Position the bellows yoke (key 70) on the mount-
ing base (key 30), and attach the link and bearing to
the beam. Start but do not tighten the four machine
screws (key 75) with washers (key 76) that attach the
yoke to the mounting base. Slide the yoke up or down
as necessary to position the beam horizontally, as
shown in figure 22. Tighten the machine screws.
10. Replace the subassembly in the case and secure
with the four machine screws (key 28, figure 19 or 20).
Reconnect all tubing.
11. If a bellows assembly with a different range is
installed, remove the machine screws and washer
(keys 40 and 39) and dial (key 38), and install a new
dial having an adjustment range corresponding to the
range of the bellows. If an optional process pressure
gauge (key 106, figure 19) is being used, install a new
gauge with the appropriate measurement capability.
12. Check all tubing connections for leaks and the
bellows yoke machine screws, tighten as necessary.
Perform the appropriate calibration procedures.
Changing Proportional or Reset Valve
1. Disconnect the appropriate tubing and remove the
proportional band valve assembly (figure 19 or 20) or
the reset restriction valve assembly (figure 20) by un-
screwing it from the relay base (key 4, figure 19 or 20).
Install the desired replacement assembly.
2. Connect the tubing, check all connections for leaks
and perform the appropriate calibration procedures.
Changing Anti-Reset Windup Differential
Relief Valve (4160KF)
Refer to figure 20 for key number locations.
1. Note the controller output pressure (zero or supply)
when the process is shut down.
2. Remove the differential relief valve assembly.
3. Refer to figure 20. Install the replacement relief
valve with the arrow positioned so that the controller
output will be as noted in step 1 when the process is
shut down.
Changing Action
Proportional-Only to a Differential Gap
Controller
A proportional-only controller may be changed to a
differential gap controller, or vice versa, by changing
the position of the proportional tubing (key 104, figure
16). Refer to figure 16 for key number locations.
1. Isolate the controller from process, control, and
supply pressure. Vent any trapped pressure from the
controller before proceeding with the following steps.
2. Disconnect the proportional tubing (key 104) from
the mounting base (key 30, figure 21 or 22) and rein-
stall it in the other connection in the mounting base.
3. Do not invert the reversing block unless also
changing the controller action.
4. Check all connections for leaks with a soap-and-
water solution. Perform the appropriate calibration pro-
cedure.
Direct to Reverse Action
Use the numbered steps below to change from direct
action (increasing pressure produces increasing output
pressure) to reverse action (increasing pressure pro-
duces decreasing output pressure), or vice versa.
Changing the action is accomplished by reversing the
positions of the reversing block and bellows tubing(s).
Refer to figure 16 for key number locations unless
otherwise directed.
1. Isolate the controller or transmitter from process,
control, and supply pressure. Vent any trapped pres-
sure from the controller or transmitter before proceed-
ing with the following steps.
2. Locate the new tubing and reversing block posi-
tions for the action desired.
3. Locate the two bellows and the reversing block
(key 59, figure 16).
4. Disconnect the tubing:
a. For a proportional-only controller or for a
transmitter, disconnect the proportional tubing (key
104) from the mounting base (key 30, figure 21 or 22)
and reconnect it in the opposite hole.
b. For a proportional-plus-reset controller,
disconnect the proportional tubing (key 104) and reset
tubing (key 117) from the mounting base (key 30, fig-
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