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Appendix
Potentiometer
Adjustment
The calibration spring has a zero point. If the contact arm is behind the zero
point, the potentiometer will register a negative reading. If the contact arm
drifts behind the zero point, it will be necessary to adjust the position of the
spring.
1. Remove the potentiometer from the consistometer.
2. Loosen the three set screws on the bottom of the potentiometer.
3. Locate the spring holder on the top of the potentiometer. It may be
positioned beneath the shaft bearing retainer. Push the spring holder to
rotate the spring within the body of the potentiometer.
4. When the contact arm is again in front of the zero point, tighten the set
screws to secure it in place.
5. The contact arm may drift while tightening the set screws. Recheck the
position of the contact arm before using the potentiometer.
Negative Reading Positive Reading
Zero Point Zero Point
Spring Holder
Shaft Bearing
Retainer
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