San Francisco's Public Utilities Commission knows the exact co-ordinatesd of every waste-water pump, its maintenance history and the likelihood of it failing.

圣弗朗西斯科的公共事业委员会清楚每条废水管道的精确坐标，维修记录，和出现故障的可能性。

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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 automatic control 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。

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Water ring vacuum pump in the waste water and air into the tank together.

水环式真空泵中废弃的水和空气一起被排到水箱里。

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