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洛阳市计划节约用水办公室助理工程师桂平研制成功了一种简便的直流电电测水位仪,经全市40个水位观测点试用一年多,证明效果良好,具有比同类产品(微安电表)灵敏度高、通断显示明显、操作简单、携带方便、易保管维修和价格便宜等优点。这种水位仪只有饭盒的一半大小,连电池重约半斤。它的工作原理是利用联接三伏电池的金属锤触水导电,给一个三极管提供偏流,通过三极管放大,点亮发光二极管。
Luoyang City, plans to save water office assistant engineer Gui Ping successfully developed a simple DC electrical water level gauge, the city’s 40 water level observation point trial for more than a year, proved effective, with similar products (microammeter meter) high sensitivity, On-off obvious, easy to operate, easy to carry, easy to maintain and cheap and so on. This level meter is only half the size of the lunch box, even about half a catty battery. Its working principle is to use a metal hammer connected to a three volt battery to contact with water and conduct electricity, providing a bias current to a triode, amplifying and tripping the light emitting diode through the triode.