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5-2 Sensitivity adjustment
Fig.18 Pilot valve
Fig19 Input/output pressure characteristic
Fig.19 shows the input current –output pressure characteristics of OUT1 and OUT2 of the pilot
valve. When the positiioner is shipped out of our plant, the output pressure is set to the optimum
state as shown in Fig.19 and this needs no adjustment ordinarily.
Caution
The sensitivity adjustment of pilot valve is effective to the actuator of double action type only. If
the sensitivity is poor because of the actuator type of load condition, turn the sensitivity adjust
screw clockwise. If hunting occurs, turn the sensitivity adjust screw counter-clockwise.
(The amount of turning varies by actuators. Turn it by 1/16 to one turn. Do not loosen the stopper
screw at this time since it is set to avoid the screw coming off.)
* If hunting occurs with an actuator of small capacity, refer to the description in 9-1 (for both
single action and double action.)
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