4150K and 4160K Series
10
Figure 6. Direct-Acting Controller Span Adjustment—
Proportional-Only Controllers
IF OUTPUT IS:
BELOW
8 TO 10 PSIG
(0.6 TO 0.7 BAR)
ABOVE
8 TO 10 PSIG
(0.6 TO 0.7 BAR)
MOVE ADJUSTER
LEFT
MOVE ADJUSTER
RIGHT
FLAPPER
NOZZLE
NOTE:
3 TO 15 PSIG (0.1 TO 1.0 BAR) OUTPUT SHOWN.
FOR 6 TO 30 PSIG (0.2 TO 2.0 BAR) OUTPUT, ADJUST
VALUES AS APPROPRIATE.
A6154 / IL
5. Rotate the pressure setting knob to the maximum
value.
6. Adjust the nozzle (key 57) until the controller output
pressure is between 8 and 10 psig (0.6 and 0.7 bar).
7. Apply an input pressure equal to the sensing element
lower range value.
8. Rotate the pressure-setting knob to the minimum
value.
Note
When performing the span adjustment
in step 9, do not watch the output gauge
while changing the calibration adjuster.
The change in output is not a good in-
dication of the change in span. While
moving the calibration adjuster, the out-
put pressure may change in the oppo-
site direction than expected. For exam-
ple, while moving the calibration
adjustor to increase span, the output
pressure may decrease. This should be
disregarded since even though the out-
put pressure decreases, the span is in-
creasing.
Loosen one screw only on the calibra-
tion adjuster and move the calibration
adjuster a small amount using the tight
screw as a pivot and retighten the
screw. If the adjustment is repeated sev-
eral times, alternate the loosening of the
Figure 7. Reverse-Acting Controller Span Adjustment—
Proportional-Only Controllers
IF OUTPUT IS:
ABOVE
8 TO 10 PSIG
(0.6 TO 0.7 BAR)
BELOW
8 TO 10 PSIG
(0.6 TO 0.7 BAR)
MOVE ADJUSTER
LEFT
MOVE ADJUSTER
RIGHT
FLAPPER
NOZZLE
NOTE:
3 TO 15 PSIG (0.1 TO 1.0 BAR) OUTPUT SHOWN.
FOR 6 TO 30 PSIG (0.2 TO 2.0 BAR) OUTPUT, ADJUST
VALUES AS APPROPRIATE.
A6155-1 / IL
two screws to prevent the nozzle from
being misaligned with the flapper. Dur-
ing calibration, always be sure the
nozzle remains perpendicular to the
flapper.
9. If the output is not between 8 and 10 psig, adjust the
controller span by loosening one of the two adjusting
screws (key 43) and move the calibration adjuster (key
41) a small distance as indicated in figure 7.
10. Repeat steps 4 through 9 until no further adjustment
is necessary.
11. Proceed to the startup procedure for proportional
controllers.
Startup: Proportional-Only Controllers
(General Tuning Guidelines)
Calibrate the controller prior to this procedure.
1. Be sure that the supply pressure regulator is deliv-
ering the proper supply pressure to the controller.
2. Rotate the pressure-setting knob to the desired set
point.
3. Set the proportional band adjustment to 100 per-
cent for fast processes (example: liquid pressure or
liquid flow). For slow processes (example: tempera-
ture), calculate the percentage from the equation
below:
For a slow process, determine the initial proportional
band setting in percent from the following equation:
200
Allowable Overshoot
Pressure Span
+
P.B.
