Usually the water level sensor we see is more of a single point water level sensor, the application is as follows.
The multi-point water level sensor enables a sensor to detect multiple levels. Compared to installing multiple single-point water level sensors on a water tank to detect multiple liquid levels, the multi-point water level sensor can save space by simply opening one hole in the container, and the single-point water level sensor needs Multiple holes are reserved and the installation takes time and space, and multiple sensors must have multiple wires. The multi-point water level sensor is more convenient to install and wire, which saves installation time.
Photoelectric water level sensors are widely used in home appliances and medical fields. In the water dispenser, coffee machine, water purifier, humidifier, etc., the water level control uses a highly reliable photoelectric water level sensor. The single point water level sensor is usually used.
The single-point water level sensor is internally composed of a set of infrared transmitting tubes and receivers. When the sensor position is in a waterless state, the light emitted by the transmitting tube is reflected back to the receiver. When in a water state, the light is refracted in the water and the receiver can only receive a small amount of light or receive no light. This is the working principle of the single-point photoelectric water level sensor.
So how does the multi-point water level sensor work?
The multi-point photoelectric water level sensor also uses the optical refraction principle for liquid level detection. The multi-point water level sensor is composed of multiple sets of transmitting and receiving tubes, and the output signal is a digital signal. Compared with the single-point water level sensor, the multi-point function is the same, mainly to detect the liquid level to achieve water shortage protection and anti-overflow reminder function.