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CALIBRATION
B - 11
CALIBRATION
Table B-2 presents calibration procedures for Type AV1 and Type
AV2 positioners in table format.
Table B-2. Calibration Procedures
AV1 AV2
Adj Procedure Adj Procedure
Zero 1. Apply 20.7 kPa (3.0 psig) input signal pres-
sure to the positioner. The actuator should be
in the closed position.
Zero 1. Turn on supply air. Apply a 4-mA input sig-
nal to the positioner. The actuator should be
in the closed position.
2. To adjust the zero, loosen the zero adjust-
ment setscrew (Fig. B-12) using a -inch
Allen wrench.
2. To adjust the zero, loosen the zero adjust-
ment setscrew (Fig. B-12) using a -inch
Allen wrench.
3. Turn the zero adjustment nut (clockwise
moves actuator toward minimum span) until
the 0 radial line on the cam intersects with the
center of the cam roller (Fig. B-4).
3. Turn the zero adjustment nut (clockwise
moves actuator toward minimum span) until
the 0 radial line on the cam intersects with the
center of the cam roller (Fig. B-4).
4. Tighten the zero adjustment setscrew. 4. Tighten the zero adjustment setscrew.
Span 1. Apply the following input signal pressures,
depending on the nomenclature type:
Types AV11 and AV15: 103.4 kPa (15.0
psig). Actuator should move to its full open
position.
Types AV12 and AV16: 186.2 kPa (27.0
psig). Actuator should move to its full open
position.
Span 1. Apply a 20-mA signal to the positioner. The
actuator should be in its full open position.
2. To adjust the span, loosen the span adjust-
ment screw (Fig. B-12) using a -inch Allen
wrench.
2. To adjust the span, loosen the span adjust-
ment screw (Fig. B-12) using a -inch Allen
wrench.
3. Slide span adjustment assembly (Fig. B-12)
until the actuator moves to align the 100%
radial line with the center of the cam roller
(toward pilot valve increases span).
3. Slide span adjustment assembly (Fig.
B-12) until the actuator moves to align the
100% radial line with the center of the cam
roller (toward pilot valve increases span).
4. Tighten the span adjustment screw. 4. Tighten the span adjustment screw.
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