目前很多机关和家庭根据各自的条件,在屋顶上安装了不同型式的太阳能热水器,为了及时了解冷水是否上满水箱,这里介绍一种水位电子报警器。这种装置使用方便,造价低廉、制做容易、安装简单。所需的主要元器件有:输出变压器 At present, many agencies and families have installed different types of solar water heaters on the roof according to their respective conditions. In order to keep abreast of whether the cold water is full of water tanks, a water level electronic alarm device is introduced here. This device is easy to use, low cost, easy to make, easy to install. The main components required are: output transformer