How is the internal structure of the optical water level switch composed?

- Jan 13, 2020-

The optical water leve sensor switch is mainly composed of three parts, including a transmitting and receiving tube, a light transmitting cone, and a wire.

Generally, the housing part of the integrated optical water leve sensor switch has a light cone shape, and the light cone may be conical, triangular or other shapes. The housing must be made of a material with strong light transmission, so many optical water leve sensor switches are colorless transparent or translucent housings.


The housing can choose anticorrosive or food-grade material PSU according to the liquid to be tested. It can detect drinking water and chemical liquids.


PC                                           Anti-corrision PSU

The transmitting tube and the receiving tube are arranged side by side on the board. The transmitting tube emits light, and the receiver receives the light. The state of the light received by the receiver when there is water and no water is different, and the sensor outputs different voltage signals according to the difference. The quality of the transmitting and receiving tubes affects the life of the sensor. Once the transmitting or receiving tube is damaged, the sensor will misjudge and be defective.

Optical water level sensor theory
Optical level sensors are usually three wires, which are the positive, negative, and signal output of the power supply. The wire only needs to pay attention to the difference in waterproof level according to the application. If it is used in a fish tank and the wire needs to be immersed in water, a waterproof wire is required.

If the accuracy requirements are high, the installation is convenient, and the reliability is high, the photoelectric liquid level sensor for applications is more convenient. The accuracy can be controlled within the range of ±1 mm. The optical principle is less affected by external factors.

As long as the optical level sensor is installed and the circuit part is connected, the sensor can work normally. The installation and circuit of the photoelectric liquid level sensor are very simple. The installation can be directly screwed against the thread, or it can be fixed with two screws, and it can be installed in any orientation. The volume is much smaller than the float-type liquid level sensor, the installation space is small, and it is more beautiful and easy to clean. The photoelectric liquid level sensor does not need to be debugged, and also has a maintenance-free function with high reliability. And scale, debris, bubbles and other problems can also be avoided by software.