The Non-Tact Liquid Flow Sensor A1MF can be used to detect high and low water levels, etc., and give a signal when the water level reaches a certain position.
The Non contact Infrared Level Sensor is a device used to sense the level of liquid in a tank. There is a board in the plastic housing. When the liquid level rises, it drives the prism, level switch will output low voltage signal. When the liquid level falls, infrared level control will output high voltage signal.
The photoelectric liquid level switch uses the principle of optical reflection to measure, the performance 
of level sensor will be affected when it is exposed to direct sunlight or other infrared interference. 
Adjust the mounting angle or use a hood to avoid it.
The photoelectric liquid level switch has high precision, low price, high reliability and wide application environment, it is less affected by strong acid, alkali and viscosity.