Instruction Manual
D103292X012
C1 Controllers and Transmitters
March 2017
26
Figure 12. Transmitter Span Adjustment
IF OUTPUT IS:
MOVE ADJUSTER
LEFT
MOVE ADJUSTER
RIGHT
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.
A6156
ABOVE
15 PSIG
(1.0 BAR)
BELOW
15 PSIG
(1.0 BAR)
For direct-acting transmitters:
4. Rotate the zero adjustment knob to zero.
5. Set the input pressure to zero.
6. Adjust the nozzle (key 54) until the transmitter output pressure is at 0.2 bar (3 psig).
7. Apply an input pressure equal to the sensing element upper range value.
Note
Proper transmitter response depends on nozzle-to-flapper alignment.
When performing the span adjustment in step 8, 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.
8. If the output pressure is not 15 psig, adjust the span by loosening the two adjusting screws (key 48) and moving the
calibration adjuster (key 36) a small distance as indicated in figure 12.
9. Repeat steps 4 through 8 until no further adjustment is necessary.
10. Proceed to the startup procedure for transmitters.
Startup: Transmitters
1. Be sure that the supply pressure regulator is delivering the proper supply pressure to the transmitter.
2. Refer to the calibration procedures for the transmitter initial settings.
3. If the transmitter is used in conjunction with a control valve, slowly open the upstream and downstream manual
shutoff valves, and close the bypass valves.
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