Azbil Corporation
26
Model
KFPA
,
KFTA
- Field Mount type Pressure Indicating Controllers
Differential gap controller
Before adjustment, perform the following confirmation procedure (confirmation of
zero deviation):
(a) Set the set point pointer at 50%
(b) Disconnect the travel link (PV) from the indicating mechanism and insert the
adjusting pin.
(c) Make sure that there is no deviation between the PV pointer and the SP pointer. If
there is any deviation, eliminate it by using the set point pointer adjusting pin.
(d) Remove the adjusting pin and connect the travel link (PV).
Adjustment
(1) Make initial setting of the flapper adjusting pin and feedback link adjusting pin as
follows:
(a) The flapper adjusting pin rotates 360
°
. Make the pin slot horizontal at the side
where the flapper rises when the adjusting pin is turned clockwise.
(b) The feedback link adjusting pin also rotates 360
°
. Make the pin slot horizontal
at the side where the link falls when the adjusting pin is turned clockwise.
(2) Set the set point pointer at 50%.
Set the differential gap setting dial at the minimum point (0%) on the INC. MEAS.
INC. OUT side. Moving the PV pointer, note the points where the output starts
rising and falling and determine the difference between these two points.
(3) Set the dial at the minimum point on the INC. MEAS. DEC. OUT side. Moving
the PV pointer, check the points where the output starts rising and falling.
(4) Adjust the deviation link so that the output the rising points of steps (2) and (3) are
distribute as equal as possible with the set point as the center of distribution.
If the distribution point is on the plus side, make the link longer. If the distribution
point is on the minus side, make the link shorter.
(5) With the flapper adjusting pin, the output rising points recorded in steps (2) and (3)
with the set point.
Figure 24
5
1020
50
100
100
50
20
105
Differential
gap dial
