该仪表在该厂铜洗车间再生槽运行良好。工作原理如下:由一个光敏电阻和另三个电阻组成直流不平衡电桥。光源通过比色管照在光敏电阻上。因c_■是兰色的,故C■浓度亦不同,透过光的强度亦不同,光敏电阻值亦起相应的变化,光越强光敏电阻值越小,使得桥路对角线上,产生电位差,测此电位差, The instrument in the plant copper tank regenerator run well. The working principle is as follows: A photosensitive resistor and the other three resistors form a DC unbalanced bridge. The light source shines on the photoresistor through the colorimetric tube. Because c_ ■ is blue, so C ■ concentration is also different through the light intensity is also different, the photosensitive resistance value also play a corresponding change, the more light the smaller the photosensitive resistance, making the bridge diagonal, resulting in Potential difference, measured this potential difference,