Red light metal detector is mainly used in metallurgical production line. It can detect cold and hot metal, output control switch signal(contact or level signal), and achieve automatic switch control function.
    features：
    *    Emitting modulated visible red light, to avoid error action that caused by ambient light
    *    With strong emission power, can reach long distance
    *    can instead cold and hot metal detector

Theory：This metal detector use high brightness red light semiconductor light emitting device as light source. After being modulated, it will emit a beam of paralleled red light.  When received by photosensitive tube, It will be magnified, and then output a switch signal. It is very convenient for installation and debugging, very suitable for using in high temperature and humid environment. When is environment temperature is below 80℃, we suggest you to use FSB-2 reflector. When the environment temperature is above 80℃, we suggest you to use FSB-1 reflector.