Liquid sensor and damage detection device and method thereof

Abstract

The invention relates to the technical field of sensors. The liquid sensor damage detection device is used for the liquid sensor with a closed cavity and comprises an external electrode, an internal electrode, a diagnosis circuit and a control circuit, the internal electrode and the external electrode are electrically connected with the diagnosis circuit; the external electrode is arranged outside the cavity; the internal electrode, the diagnosis circuit and the control circuit are arranged in the cavity; the diagnosis circuit is used for diagnosing whether the liquid sensor is damaged or not according to a diagnosis signal between the external electrode and the internal electrode; the control circuit is connected to the diagnosis circuit to turn on the diagnosis circuit and turn off the diagnosis circuit after diagnosis is completed. According to the technical scheme, the diagnosis circuit does not discharge to the outside all the time, strong current is attracted to enter an external electrode, and the liquid sensor damage detection device is higher in stability and service life.

Description

technical field [0001] The present disclosure relates to the technical field of sensors, in particular to a liquid sensor and a damage detection device and method thereof. Background technique [0002] A liquid sensor is an electronic sensor that can measure the physical or chemical properties of a liquid. It can convert the physical or chemical properties of the liquid into electrical signals, such as dissolved oxygen and pH in water. [0003] Since the liquid sensor is often arranged in a field environment, there are often aquatic organisms or debris in the water impacting the liquid sensor in the field environment, so the liquid sensor is prone to damage, especially the membrane used for selective filtration. When the shell or membrane of the liquid sensor is damaged, the cavity of the liquid sensor will enter the liquid, and the reaction electrode is arranged in the cavity of the liquid sensor, so the measurement result will seriously deviate from the normal value. [0...

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Problems solved by technology

[0005] However, this detection method needs to set up external electrodes, and the external electrodes are connected to the internal circuit board, and the liquid sensor arranged in the field environment is often disturbed by strong electricity, which easily enters the internal circuit board through the external electrodes, resulting in internal The circuit board is burned, resulting in low stability and life of the liquid sensor

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