Liquid detection device and liquid detection system for abnormal liquid on a surface

A liquid detection device, for detecting whether there is abnormal liquid on a surface to be detected, comprising:

• a housing;
• a first electrode, mounted on a bottom surface of the housing, the bottom surface facing to the surface to be detected, wherein a distance between the first electrode and the surface to be detected is set as a first distance;
• a second electrode, mounted on the bottom surface of the housing, wherein a distance between the second electrode and the surface to be detected is set as a second distance, the first distance and the second distance having a distance difference so that one of the first electrode and the second electrode is spaced relatively farther from the surface to be detected and the other is spaced relatively closer to the surface to be detected, the first electrode and the second electrode being exposed to the abnormal liquid on the surface to be detected;
• a measuring circuit, installed inside the housing, and connected the first electrode and the second electrode, wherein a sensitivity of the liquid detection device is adjusted by adjusting the distance difference between the first electrode and the second electrode;
• and
• a static electricity elimination circuit for eliminating static electricity existed in the liquid detection device periodically, wherein the static electricity elimination circuit detects and records an environment static electricity quantity, and the measuring circuit determines whether there is the abnormal liquid or not according to impedance value between the first electrode and the second electrode, and the measuring circuit also references the detected and recorded environment static electricity quantity to avoid misjudgment.