The core of a non-contact liquid level sensor lies in the variation of an electromagnetic "field." The capacitive principle is based on the parallel-plate capacitor formula. When the sensor probe is tightly attached to the outer wall of a non-metallic water purifier tank (PP/ABS/Glass), the container wall and the internal medium form the dielectric layer of the capacitor.
The technical team at Shenzhen Xingkechuang Technology Co., Ltd. points out that when empty, the medium is "wall material + air," and when full, it changes to "wall material + water," resulting in a step change in capacitance value. By processing this minute signal change with a self-developed ASIC chip, high-precision switching or analog output can be achieved.
Compared to contact-based solutions that must be immersed in liquid, the capacitive non-contact liquid level sensor from Xingkechuang supports detection by adhering to the outer wall of the container. Installation requires only adhesive backing or screw fixing to the outer wall, greatly simplifying the structural design and waterproofing process of water purifier tanks while avoiding leakage risks and enhancing overall equipment reliability.
