Working Principle:
Intelligent non-contact liquid level sensor use the water induction capacitor to detect the liquid. When no liquid approach the sensor, the sensor has the certain static capacitance to the gound due to the distributive capacitance exist. When the liquid level rise and close to the sensor, the liquid's parasitic capacitance will be coupled to the static capacitance then enable the sensor's capacitance increase and the changed capacitance signal will be imported into the controlling IC to coverter it into some signal variation, use some algorithm to detect and judge this signal variation level, when this signal variation excess certain values will be considered the liquid level reach the detecting point. It can works with an Arduino display to output, can used on a poly tank.

Features:
Intelligent non-contact liquid level sensor module, applicable to non-metallic containers without direct contact with the liquid, not affected by scale or other impurities.
Intelligent liquid level benchmark adjustment and level memory function, liquid level display mode.
Electronic circuit structure rather than machinery ensures stable performance, durability and a long service life.
High stability, high sensitivity, strong anit-interference ability make sure it won't be affected by electromagnet, special designed to deal with power frequency interference and common mode interference
NPN signal output, where sensor the liquid, it will output low level otherwise there is not signal output.

Specifications:
Output Signal: NPN
Input Voltage: DC 5-24V
Current: 5mA
Output Voltage: InVCC (high level), 0V (low level)
Output Current: 1-100mA
Response Time: 500ms
Operation Temperature: 0-85℃
Induction Thickness (Sensitivity): 0-13mm
Humidity: 5% -100%
Material: ABS
Waterproof Grade: IP67
Size: 28X16.9mm / 1.10X0.67inch (D*H)

Product Features

• ☏ Intelligent non-contact liquid level sensor module, applicable to non-metallic containers without direct contact with the liquid, not affected by scale or other impurities. It can be used to monitor the strong acid, strong alkali solvent and toxic liquid in closed containers. More applications, such as the water environmental protection, water tower improve, drone spraying machine, fish tank running water monitoring, smart home improvement, etc..
• ☏ Intelligent liquid level benchmark adjustment and level memory function with indicator to inform when detecting the liquid and support multi points in series connection. Pin out on the connector: Brown is VCC(+), Blue is GND(-), Yellow is (Out), Black is (Mode).
• ☏ Electronic circuit structure rather than machinery ensures stable performance, durability and a long service life. NPN signal output, where sensor the liquid, it will output low level otherwise there is not signal output.
• ☏ DC 5-24V wide voltage input compatible with most electric system and products. High stability, high sensitivity, strong anit-interference ability make sure it won't be affected by electromagnet, special designed to deal with power frequency interference and common mode interference.
• ☏ Strong compatibility through a variety of non-metallic material containers, such as plastic, glass, ceramics etc, with a 13mm or more induction distance and liquid, powder, particles can be detected. It can works with an Arduino display to output, can used on a poly tank, can be placed outside the plastic tank with the liquid, adhesion is for the fixed.

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