In sewage treatment plants, it is necessary to monitor the value of dissolved oxygen in water quality. DUC2-DO dissolved oxygen controller can not only connect digital dissolved oxygen sensor to realize real-time online monitoring, but also has control function. The value of dissolved oxygen in sewage can be controlled by the following methods: Increase oxygen supply: The dissolved oxygen value in sewage can be increased by increasing oxygen supply, such as increasing aeration equipment or increasing water flow; Reduce the discharge of organic matter: organic matter can consume oxygen in sewage, so reducing the discharge of organic matter can reduce the oxygen consumption in sewage, thereby increasing the value of dissolved oxygen; Optimize the biological treatment process: The biological treatment process can convert organic matter into inorganic matter, thereby reducing the content of organic matter, and can also increase the dissolved oxygen value in sewage. 

This dissolved oxygen controller has two SPST multi-function relays, which can be connected to control equipment to adjust the dissolved oxygen value of water quality. For example, when the dissolved oxygen value in water is too low, it can be connected to aeration equipment. When the value is reached, the device will be automatically turned on for oxygenation.