ITR9809-F Description
․The ITR9809-F/T consist of an infrared emitting diode and an NPN silicon phototransistor, encased side-by-side on converging optical axis in a black thermoplastic housing, ․The phototransistor receives radiation from the IR LED only . This is the normal situation. ․Bt when an object is in between , phototransistor could not receives the radiation.