Non-contact type capacitance induction level sensor
A liquid level sensor and capacitive sensing technology, applied in the field of liquid level sensors, can solve problems such as short service life, failure of water level detection, and easy to be damaged by lightning strikes, so as to reduce the probability of failure and prolong the service life
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[0017] Example 1:
[0018] Refer to figure 1 , A non-contact capacitive sensing liquid level sensor, comprising an insulating housing 1, a capacitive sensing metal piece 2, a liquid level detection circuit 3, and an external signal interface 4. The insulating housing is arranged vertically, and the capacitive sensing metal piece is vertically arranged. Is arranged in a housing, the liquid level detection circuit is installed in the housing, and the liquid level detection circuit includes: an analog input port for connecting with the capacitive sensing metal part; for detecting the capacitance value of the analog input port, and The liquid level measurement module for obtaining the current liquid level value according to the preset correspondence relationship between the capacitance value and the liquid level, and the capacitance sensing metal piece is connected to the analog input port.
[0019] The capacitive sensing metal part is copper clad 2, and no less than two copper clads...
Example Embodiment
[0023] Example 2:
[0024] Refer to figure 2 The capacitive sensing metal part of this embodiment is a metal detection strip 22.
[0025] Liquid submerges the insulating shell, and the difference in the area covered by the metal detection strip will cause the change of capacitance. The change value of the capacitance is detected by the liquid level detection circuit 3 to linearly reflect the height and range ratio of the liquid level, that is, the capacitance value and the liquid level. The corresponding relationship is linear.
[0026] The use process of this embodiment is the same as that of the first embodiment.
[0027] This embodiment is applied in an oil tank, and the oil level signal is linearly and continuously transmitted to the automobile control system through an external interface.
[0028] This embodiment can also be applied to a water tank in which the liquid level signal is linearly and continuously transmitted to an external display system through an external signa...
Example Embodiment
[0029] Embodiment three:
[0030] The capacitive sensing metal part of this embodiment is a sensing spring.
[0031] The liquid floods the insulating shell, causing the capacitance of the induction spring in the insulating shell to change. The liquid level detection circuit 3 detects the capacitance change value to reflect the liquid level status or range ratio of the detected point.
[0032] The use of the spring keeps the capacitive sensing metal parts in close contact with the inner wall of the insulating shell, improving the sensitivity of liquid level detection, and is especially suitable for insulating shells with larger diameters.
[0033] The use process of this embodiment is the same as that of the first embodiment.
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