Azbil Corporation
24
Model
KFPA
,
KFTA
- Field Mount type Pressure Indicating Controllers
5-2-3: Other calibration and adjustment procedures
On-Off 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) Turn fully counterclockwise the set point dial and set it to the white edge line of
the INC. MEAS. INC. OUT scale. Apply a deviation that will make the output
59.1 + 0.8 kPa {443 + 6 mmHg}. Read the deviation by the pointer on the scale.
(2) Turn fully clockwise the set point dial and set it to the yellow edge line of the INC.
MEAS. DEC. OUT scale. Then perform a procedure the same as step (1).
(3) Adjust the deviation link length so that the deviation values read in steps (1) and
(2) are the same in the value but the reverse in the direction. The link becomes
shorter when the deviation link adjusting screw is turned upward.
When the deviation values in steps (1) and (2) are of the same direction, if the red
pointer shows a higher value than the green pointer, make the link longer. If the
green pointer shows a higher value, make the link shorter.
(4) Make the deviation zero, and set the set point dial to the white line. Under this
state, adjust the flapper adjusting screw so that the output is somewhere within a
range of 10 to 130 kPa {0.1 to 1.3 kgf/cm²}.
(5) Set the set point dial to the yellow line, and adjust the deviation link length so that
the output is somewhere within a range of 10 to 130 kPa {0.1 to 1.3 kgf/cm²}.
Figure 23 On/Off controller unit
