Calibration - ABB AV1 Manual

12

Calibration

Table B-1 presents calibration procedures for Type AV1 and
Type AV2 positioners in table format.
Adj Procedure
Zero
1. Apply 20.7 kPa (3.0 psig) input signal pressure to
the positioner. The actuator should be in the
closed position.
2. To adjust the zero, loosen the zero adjustment
setscrew (Fig. B-12) using a 3/32 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).
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.
2. To adjust the span, loosen the span adjustment
screw (Fig. B-12) using a 3/32inch 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).
4. Tighten the span adjustment screw.
Figure B-12. Calibration Adjustments
AVI and AV2 POSITIONERS | SOI/AV12 RE V. A
AV1
Table B-1. Calibration Procedures
Adj Procedure
1. Turn on supply air. Apply a 4-mA input signal to
Zero
the positioner. The actuator should be in the
closed position.
2. To adjust the zero, loosen the zero adjustment
setscrew (Fig. B-12) using a 3/32 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).
4. Tighten the zero adjustment setscrew.
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 adjustment
screw (Fig. B-12) using a 3/32 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).
4. Tighten the span adjustment screw.
AV2 & AV27