The OPB607A series Object Sensor that consists of an infrared Light Emitting Diode (LED) and an NPN silicon photodarlington which are mounted "side-by-side" on parallel axes in a black plastic housing. The emitting diode and phototransistor of both the device is encapsulated in a filtering epoxy that reduces ambient light noise. On both models, the phototransistors respond to radiation from the emitter only when a reflective object passes within the field of view.
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