| 摘要 |
PURPOSE:To detect the condition of a stop cock opening and closing from a remote position, by fixing an oscillating circuit, which transmits or stops a radio wave corresponding to the position of a knob opening and closing, to a part of the pipe of a fluid circuit opposed to a radio wave absorber provided in a part of the knob. CONSTITUTION:When a fluid stop cock is placed in an opening condition, a ferrite magnetic material 4 being a radio wave absorber is sufficiently distant from an oscillating circuit 5, and the oscillating circuit 5 comes to be in an oscillating condition. When the fluid stop cock is placed in a closing condition, the ferrite magnetic material 4 is placed in a position opposed to further adjacent to the oscillating circuit 5, and a device, increasing a coupling loss of the ferrite magnetic material 4 with a resonance circuit in the oscillating circuit 5, acts as stopping oscillation. Accordingly, the fluid stop cock can be confirmed to be opened and closed even from an enough distant position from the fluid stop cock with no necessity for wiring a signal wire of the opening and closing condition. |
