| 摘要 |
PURPOSE:To eliminate current consumption more than necessary, by automatically stopping the operation of a water depth gauge detecting that the water depth is below a fixed level, while a fixed time passes as it is in the normal operation mode thereof. CONSTITUTION:With the operation of a mode switch MS, the mode signal Pm goes to the L level and a display switching circuit 4 outputs water depth information Ps as display information P2. As the depth exceeds a fixed value after the start of dividing, the detection signal Pk from a water depth detection circuit 11 turns to the L level and upon the closing of an AND gate 13, the timer operation is stopped to display water depth information Ps from a water pressure measuring circuit 10 is shown on a display unit 6. Then, when the dividing ends, the water depth information Ps outputted will be down below a fixed level to turn the detection signal Pk to H and a timer circuit 12 starts operation. As a specified time passes after the missing of the MS operation, a time expiration signal Pt of the H level is outputted from the timer circuit 12 and a control signal Pc through an OR gate 16 to reset an amplification circuit 9 and a water pressure measuring circuit 10 to be reset, hence disabled. |
