普通电子型水位计一般都用直流电极探测水位。由于直流电的电解电镀等综合效应,使长期置于水中通以直流电的探测电极很快失去作用。为此本人试制了一种交流电水位计,探测电极上通过微弱的交流电,避免了直流供电造成的电极失效。本方法经在太阳能热水器上使用,过去不到一个月就要清理一次电极。而 Ordinary electronic water level meter generally use the DC electrode to detect water level. Due to the combined effect of direct current electroplating and the like, the detecting electrode which is permanently placed in the water and is energized with direct current is rapidly deactivated. To this end, I made a trial of an AC water level probe, the detection electrode through a weak AC, to avoid the DC power supply caused by electrode failure. This method is used on solar water heaters, in less than a month to clean up once the electrode. and