1 引言在水处理工程中,经常会碰到液位自动控制问题。尤其当集水池在室外,而水处理设备在室内时,常因传感器或其连接线、接点暴露在室外受潮而引起失控,产生误动作。一般废水在连续处理的过程中,往往不一定需要水位到达集水池最高位时才投入工作,但对下限水位却有要求,以防止水泵空转,尤其是某些电解法处理废水的设备会因失水而损坏。 1 Introduction In water treatment projects, often encounter the problem of automatic control of the level. Especially when the water collecting tank is outdoors and the water treatment equipment is indoors, it is often out of control due to the sensor or its connecting wires and contacts exposed to moisture in the outdoor, resulting in malfunction. In the process of continuous treatment, the general waste water often does not need to be put into operation when the water level reaches the highest level of the sump. However, there is a requirement for the lower water level to prevent the pump from idling. In particular, Water damage.