| 摘要 |
A positioner includes a shift magnitude calculating portion that calculates a shift magnitude from the equilibrium state of a pilot relay, from an input air pressure that is inputted into the pilot relay and an output air pressure that is outputted from the pilot relay. A control calculating portion determines a control signal from an actual opening signal, an opening setting value, and the shift magnitude from the equilibrium state of the pilot relay that is calculated by the shift magnitude calculating portion, and outputs it to the electropneumatic converter. |
