4195KA, KB, KC, and KS Controllers
Instruction Manual
Form 5207
April 2007
6-39
Aligning the Flexures
WARNING
Refer to the Maintenance WARNING
on page 6-1.
1. Apply remote set point pressure equal to 50
percent of the remote set point pressure range.
2. The guide flexure (key 119) should be straight
and horizontal. If not, straighten the flexure by
loosening the machine screw (key 122) on the end
of the flexure that is attached to the top of the pivot
assembly A (key 114) and allow the flexure to
straighten itself. Tighten the machine screw.
3. If the flexure is not horizontal, loosen the two
machine screws (key 139) and raise or lower the
pedestal assembly (key 105) until the guide flexure
is horizontal. Retighten the machine screws (key
139) and ensure the diaphragm assembly extension
(key 134) is centered in the upper travel stop (key
83) hole.
4. The drive flexure (key 79) should be straight. If
not, proceed as follows:
a. Loosen the screw (key 118) on the adjustment
arm of pivot assembly A (key 114) and loosen
the screws holding the drive flexure.
b. Set the length of the adjustment arm so that
the drive flexure is parallel to the centerline of the
diaphragm capsule assembly (key 80).
c. Tighten the screw (key 118) on the
adjustment arm.
Note
See figure 6-20. The adjustment arm of
the remote set point pivot assembly A
turns on a bushing at each end of the
shaft supporting the adjustment arm.
In the next step, position the shaft so
both bushings ‘‘float’’ inside the
bearings and do not rest against the
end of either bearing.
d. Hold the pivot assembly A shaft in the middle
of the bushing end play. Be sure neither bushing
is resting against the inside end of either bearing.
e. Tighten the screws that hold the drive flexure
in place.
Setting the Travel Stops
WARNING
Refer to the Maintenance WARNING
on page 6-1.
1. Loosen the set screw (key 87) in the travel stop
nut (key 86).
CAUTION
Make sure the loose travel stop nut
does not bind on the diaphragm
capsule extension (key 134) when
pressurizing the capsules (key 80).
Damage to the capsules may result.
2. Full span stop—Adjust the remote set point
pressure to 2-1/2 percent of span greater than the
remote set point input range upper limit.
Loosen the two screws (keys 139 and 140) that
secure the travel stop (key 83) to the mounting plate
(key 111). Slide the travel stop until it is just touching
the end of the capsule stack. Tighten the travel stop
mounting screws to lock it into position.
3. Zero Stop—Adjust the remote set point pressure
to 2-1/2 percent of span less than the remote set
point input range lower limit.
Slide the travel stop nut (key 86), along the
diaphragm capsule extension (key 134) until it is just
touching the travel stop (key 83). Tighten the set
screw (key 87) to lock the travel stop nut in position.
Aligning the Linkage
WARNING
Refer to the Maintenance WARNING
on page 6-1.
1. Adjust the remote set point pressure to 50
percent of the remote set point input range.
2. Set the linearity adjustment screw in the center of
the slot on the lever arm of pivot clevis assembly B
(key 115). See figure 6-23 for the linearity
adjustment location.
3. Set the length of link A (key 116) so the lever
arms of pivot assembly A and pivot assembly B are
parallel and link A is perpendicular to them.
4. Set the length of link B (key 126) so the set point
indicator indicates mid-scale on the process scale
span.
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