| 摘要 |
PROBLEM TO BE SOLVED: To perform highly reliable detection by preventing an electrolysis (ionization) of liquid so as not to change the properties of the liquid. SOLUTION: The liquid detection device 10 detects liquid inside containers T1 and T2 which house conductive liquid therein. The device 10 comprises an electrode part 26 (26a-26e), impedance 22 and an alternating current (AC) signal source 21. The electrode part 26 is disposed so as to contact the liquid inside the containers T1 and T2 leading to be energized by the liquid contact. The device 10 is further equipped with a liquid detection circuit 20 and a judgement means 31. The liquid detection circuit 20 outputs a signal indicating an energizing state of the electrode part 26 by inputting an AC signal which does not contain direct current components by way of the impedance 22 from the AC signal source 21 and a binary signal to indicate whether the electrode part 26 is energized or not, based on the output signal. The judgment means 31 determines as to the presence or absence of the liquid in the electrode part 26 based on the binary signal output from the liquid detection circuit 20. COPYRIGHT: (C)2006,JPO&NCIPI |
