With the popularity of swimming, swimming pool is becoming more and more common in our life. Generally speaking, the swimming pool is a place for people to engage in swimming and other sports, which can be activities or competitions. Most swimming pools are built on the ground, according to the water temperature can be divided into general swimming pool and heated swimming pool. On the other hand, as a special place for swimming, swimming pools can be divided into indoor and outdoor. The swimming pool for official competitions is 50 meters in length, more than 21 meters in width, and more than 1.8 meters in water depth; if it is a swimming pool for comprehensive sports such as swimming, diving and water polo, the water depth is between 1.3 and 3.5 meters. However, the water level of a swimming pool is not constant. As the water level of the pool is continuously reduced due to evaporation of the surface of the pool, drainage of the pool, swimmers taking out of the pool and backwashing of filtering equipment, people need to make up water for the swimming pool. However, the requirements for the water level of the pool are regulated. Swimming pools that do not meet the regulations are extremely dangerous to people. Too deep may lead to accidental drowning, and too shallow may lead to bottom injury, therefore, in daily life, the detection and control of the water level of the swimming pool is extremely important.

This provides a swimming pool water level automatic detection and control system, combined with the British SST liquid level sensor, and then through the single-chip microcomputer or other control system to control the water pump and drain valve for accurate control of the liquid level, with very high flexibility and practicality, can greatly reduce costs. The system structure is small, the function is simple and practical, and the SST liquid level switch belongs to the photoelectric type, high precision single point measurement, not only easy to install but also in the future replacement and maintenance are very convenient, has been widely used in large industrial equipment and various commonly used electrical appliances, the effect is remarkable.

As shown in the figure below, using the modelphotoelectric liquid level sensorThe LLC200A3SH two liquid level switches are installed at the water level line to be controlled in the swimming pool. No. 1 is calibrated to measure the high water level of zui and No. 2 is calibrated to measure the low water level of zui. Only the probe needs to be exposed during installation. Since this model outputs high level in the air, if the water level continues to be at the installation position of the liquid level switch labeled 2, No. 2 output is low level and No. 1 is high, indicating that the water level. If the water level is higher than No. 1 position, both liquid level switches will output low level, indicating that the water level is too high. At this time, the drain valve should be opened through the control unit for drainage treatment until No. 1 high level and No. 2 low level. On the contrary, if the water level drops to No. 2 position, the output of both liquid level switches is low level, then the water pump should be started through the control system to replenish water to the pool until the water level reaches between No. 1 and No. 2. For example, if you need to control the water level at 3 meters, you can install No. 1 at about 3.1 meters and No. 2 at about 2.9 meters, so that the water level can be detected by two liquid level switches, thus strictly controlling the water level of the swimming pool within a safe depth range.