| 摘要 |
PURPOSE:To confirm opening/closing of gas plug at the position separated sufficiently from gas stop plug by providing a permanent magnet chip at the position facing with a magnetic detection circuit secured to a knob only when the knob is at the closing position. CONSTITUTION:Under open state of gas stop plug 1, magnetic detection circuit 4 is separated sufficiently from a permanent magnet chip 5 and not detect the magnetic force. While under closed state, said circuit 4 will face against the permanent magnet chip 5 thus to detect the magnetic force of permanent magnet 5. Signals transmitted from said circuit 4 are taken out to inform the open/close state of gas stop plug 1 even at the position remote from said plug 1. |
