The Honeywell HOA1879 series offers a robust and reliable solution for position sensing applications. This transmissive sensor combines an infrared emitting diode with an NPN silicon phototransistor, encapsulated within a durable black IR transmissive thermoplastic housing. The design minimizes aperture blockage from airborne contaminants, making it ideal for harsh industrial environments. The HOA1879-011 model, with its 0.060 inch detector aperture, is particularly well-suited for applications demanding precise position resolution, such as automated machinery, security systems, and conveyor tracking. The housing material, IR transmissive polysulfone, is compatible with common cleaning agents like methanol and isopropanol.