Float switch according to the required water level changes, automaticcontrol of pump start and stop, do not need special care.
浮球开关可以根据所需的水位变化，自动控制泵的启动与停止，不需专人看管。
2
The technology process and the control demands of a waste water pump are presented, and the design of hardware and software based on PLC for the pump station automaticcontrol are described.
介绍了一个污水泵站的控制工艺和控制要求，阐述了泵站自动控制系统中plc的硬件、软件设计。
3
Operation of excess sludge pump is controlled by the computer inside central control room or by PLC under automatic mode.