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C1 Controllers and Transmitters

Instruction Manual

September 2009

Proper controller response depends

on nozzle−to−flapper alignment.

When performing span adjustments,

carefully loosen both calibration

adjuster screws while holding the

calibration adjuster in place. Then

move the calibration adjuster slightly

in the required direction by hand or

using a screwdriver. Verify proper

nozzle−to−flapper alignment and hold

the calibration adjuster in place while

tightening both adjustment screws.

11. If the output pressure is not between 0.6 and 0.7

bar (8 and 10 psig), adjust the controller span by

loosening the two adjusting screws (key 48) and

moving the calibration adjuster (key 36) a small

distance as indicated in figure 8.

12. Repeat steps 6 through 11 until no further

adjustment is necessary.

13. For C1P and C1B controllers with anti−reset

windup, remove the two machine screws, anti−reset

windup cover, and two O−rings installed in step 1 of

this procedure. Install the anti−reset windup

assembly (key 190) with the arrow pointing in the

direction recorded in step 1.

14. Proceed to the Startup procedures for

proportional−plus−reset controllers.

For direct−acting controllers:

6. Apply an input pressure equal to the sensing

element lower range value.

7. Rotate the pressure setting knob to the minimum

value.

8. Adjust the nozzle (key 54) until the controller

output pressure is between 0.6 and 0.7 bar (8

and 10 psig).

9. Apply an input pressure equal to the sensing

element upper range value.

10. Rotate the pressure setting knob to the

maximum value.

Note

When performing the span adjustment

in step 11, do not watch the output

gauge while changing the calibration

adjuster. The change in output is not a

good indication of the change in span.

While moving the calibration adjuster,

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 (0.2 TO 1.0 BAR) OUTPUT SHOWN.

FOR 6 TO 30 PSIG (0.4 TO 2.0 BAR) OUTPUT, ADJUST

VALUES AS APPROPRIATE.

A6154 / IL

Figure 9. Direct−Acting Controller Span Adjustment

—Proportional−Plus−Reset Controllers

the output pressure may change in the

opposite direction than expected. For

example, while moving the calibration

adjuster to increase span, the output

pressure may decrease. This should

be disregarded since even though the

output pressure decreases, the span is

increasing.