DEVICE FOR OUTPUTTING OPENING DETECTION OF ELECTRIC OPERATED VALVE

Japanese Patent JP2019035507

A

To supply electric power from an AC power source 41 to an electric operated valve 76 of an opening detection device 65 via long-distance electric power lines 43, 44 and transmit an opening detection value p of the electric operated valve 76 to an opening output device 42 for display-outputting the opening without additionally using signal lines.SOLUTION: Within a response period Wa which is a half period of an AC frequency f1 (60 Hz), a reference detection signal PSa2 of a different frequency f5 (100 kHz) and an opening detection signal PSb2 are generated from an opening detection device 65 while spacing an opening detection time difference, and are superimposed and transmitted to an opening output device 42. The time difference is selected to the sum (=Wp+W02) of a detection time interval Wp (Fig. 8(6)) corresponding to an opening detection value p and a predetermined detection offset value W02 (Wa2