Honeywell AIDC Honeywell AIDC HOA1879-011 Infrared Sensor Case type Thermo plastic housing with air gap

Consisting of an infrared LED and a counterpart of an NPN photo transistor, poured into a black thermoplastic housing with an air gap between the two components. The photo transistor switches when an opaque object is moving through this air gap and interrupts the infra red beam.