Through the monitoring of the water level index by the liquid level controller, the real-time opening and closing of the metering pump is controlled according to the change of the water level index, and the liquid level of the water system is controlled between the set values ??to ensure the stable operation of the system. The equipment installation system is also equipped with a time controller. According to the circulating water level standard, the system automatically stops dosing when the upper limit is reached, and when the liquid level controller communicates the time controller through the actuator, the system automatically dosing. 　

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