| 摘要 |
<p>PURPOSE:To achieve a higher detection accuracy with limited consumption of a battery cell, by making a resistance value within a circuit change with the operation of individual switching elements corresponding to electric conductivity of a liquid interposed between detection electrodes to perform a switching operation with the control of a terminal voltage. CONSTITUTION:When a liquid reaches between detection electrodes 5 and 5', current flows through power source lines 2 and 2' corresponding to electric conductivity of the liquid. A circuit comprising a Zener diode 13 and a programmable unijunction transistor PUT15 detects a terminal voltage of a discrimination resistance 8 and when voltage of the resistance 8 is larger than the voltage of a diode 13, a specified inter-gate cathode voltage is applied to a transistor 15 and a transistor 9 is turned OFF. A circuit comprising a resistance 9, a Zener diode 20 and the PUT21 detects a terminal voltage of an ignition capacitor 18 and when a voltage of the capacitor 18 is larger than the voltage of the diode 20, the PUT21 is turned ON. Thus, energy charged in the capacitor 18 is discharged to send an ignition output to an ignitor.</p> |
