Photo resistor(FZ711G) are ingenious combinated with signal relay (WE77/Exl Bi) The detection ultraviolet light is replaced by visible light. The problem of frequent false alarms caused by dowtherm boiler flame detector is resolved.

• 将光敏电阻 (FZ711G)与信号继电器 (WE77/Ex1 Bi)巧妙组合 ,用可见光代替紫外光进行检测 ,解决热媒炉火焰检测器频繁发生误报的问题