Water purifiers with heating or cooling functions create a significant temperature difference inside and outside the tank, making the inner wall highly susceptible to condensation or even water films. This is a fatal interference for optical sensors relying on light refraction, often resulting in false "full" or "water present" readings.
The capacitive principle of non-contact liquid level sensors demonstrates its advantage in this scenario. Through electric field distribution modeling, Shenzhen Xingkechuang Technology Co., Ltd. discovered that the capacitance contribution of a thin layer of condensation is far less than that of a rising water level. The optimized algorithm sets a reasonable trigger threshold, flipping the output only when a large volume of water (actual liquid level) is present opposite the probe.
In the application of hot/cold water purifier tanks, Xingkechuang sensors detect by adhering to the outer wall, ignoring water droplets and mist, ensuring precise water control even in humid kitchen environments and enhancing user trust.
