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Capacitance induction type liquid level sensor

A liquid level sensor and capacitive sensing technology, applied in the field of liquid level sensors, can solve the problems of inability to calculate the result value, circuit unreliability, detection errors, etc., to reduce the influence of detection range and accuracy, improve stability and reliability, The effect of wide detection range

Inactive Publication Date: 2010-01-13
佛山市中协电器有限公司
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Problems solved by technology

In addition, when the MCU starts to detect whether there is water or no water, it judges whether there is water by the capacitance change on the sensor board. , when the power is turned on again, since the measured value and the reference value of the MCU calculation are variables, if the water level does not change, the capacitance on the induction plate will not change. When the MCU performs calculations, it is difficult or impossible The result value cannot be calculated, and detection errors occur, resulting in unreliability of circuit work

Method used

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  • Capacitance induction type liquid level sensor
  • Capacitance induction type liquid level sensor
  • Capacitance induction type liquid level sensor

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Embodiment Construction

[0037] The capacitive inductive liquid level sensor of the present invention will be further described below in conjunction with specific embodiments.

[0038] Such as figure 1 As shown, a capacitive sensing liquid level sensor includes a PCB circuit board 21, an induction board 22 and an outer box 23, wherein the PCB circuit board 21 is a printed circuit board with components to form a circuit, and the induction board 22 is copper foil, but In actual implementation, iron foil or other metal foils can also be used instead to achieve the same or similar functions, but not limited thereto; the outer box 23 is made of plastic, but in actual embodiments, other materials can also be used instead , to achieve the same or similar functions, not limited thereto; the PCB circuit board 21 and the induction board 22 are placed in the outer box 23, and the induction board 22 and the PCB circuit board 21 are electrically connected with the PCB circuit board 21 in structure. The boards 21 ...

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Abstract

The invention relates to a liquid level sensor, in particular to a capacitance induction type liquid level sensor. The invention aims at providing a capacitance induction type liquid level sensor which not only can overcome detection fault caused by unexpected interruption of power supply, but also has the function of temperature compensation and can conveniently calibrate the detection reference of water or other liquid in containers which is made of different materials and has different wall thicknesses, so that an intelligentized detection circuit can be realized; furthermore, the accuracy, the stability and the reliability of the working condition of the detection circuit are greatly improved, and the installation is simple and convenient.

Description

technical field [0001] The invention relates to a liquid level sensor, in particular to a capacitive inductive liquid level sensor. Background technique [0002] The capacitive inductive liquid level sensor currently used for non-contact measurement usually uses an electronic circuit to detect water or other liquids in the container wall and the capacitance generated by the sensor plate of the sensor switch to determine whether there is water or other liquids, and output There are usually two detection methods for corresponding signals: [0003] The first way is that a general-purpose digital electronic circuit forms an oscillator with a certain frequency to generate a high-frequency pulse signal of tens to hundreds of thousands of frequencies, which is generated by charging and discharging at the input terminal of the comparator by sensing the capacitance change between the plate and the liquid. The potential change is compared with the potential of the reference terminal,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/26
Inventor 刘兆基
Owner 佛山市中协电器有限公司
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