当水位超过限制高度时，发出信号启动自吸泵排水。

When the level exceed limited height, the alarm send signals to start self-priming pump drain.

youdao

当水位超过限制高度时，发出信号启动自吸泵排水。

When the level exceed limited height, the alarm send signals to start self-priming pump drain.

youdao