MKS 247D - Scaling Control Potentiometer Adjustment

Chapter Four: Operation How To Setu
p
the S
y
stem
57
7. Adjust the SCALING CONTROL POTENTIOMETER for
each
MFC in use.
The Scaling Control Potentiometers set the values of the Scaling Control Factors.
Note
It is
critical
for proper system operation that the Scaling Control
Potentiometers are set correctly. Refer to
Scaling Controls
, page 46, for
more information.
The outer control represents factors of 100; indicated by the numbers 0 to 10 which
display in the window at the top of the potentiometer. The inner control represents
factors of 10, in divisions of 2; these values are set when the appropriate value is aligned
with the vertical line beneath the window. The adjustment knob cannot be turned below
0 or above the full scale setting of 1000.
To adjust the Scaling Control Potentiometer to the setting of “288” calculated in the
example in step 6, page 56:
a. Unlock the slide lock on the right side of the control by pushing it up
(counterclockwise).
b. Turn the adjustment knob clockwise until the “2” appears in the window.
c. Continue turning the adjustment knob until the line on the inner control which
represents “88” is aligned with the vertical line beneath the window, as shown in
Figure 9.
d. Lock the position of the control by pushing the slide lock on the right side of the
control down (clockwise).
2
10
30
20
40
50
60
70
80
90
0
Outer Control
(
Sets factors of 100
)
Slide Lock
Ad
j
ustment Kno
b
Inner Control
(
Sets factors of 10
)
Window
Figure 9: Scaling Control Potentiometer - Example Setting
(Set to “288”)