The Honeywell HOA0881-T55 series is a transmissive sensor designed for accurate position sensing applications. It consists of an infrared emitting diode facing an NPN silicon phototransistor housed in a thermoplastic material. The sensor triggers when an opaque object interrupts the infrared beam. Available in multiple configurations, including mounting options, lead spacing, and housing materials, it caters to diverse industrial needs. The HOA086X series utilizes a transmissive housing, while the HOA087X series uses an opaque housing for ambient light rejection. Suitable for industrial automation, control systems, and applications requiring precise position detection.