The Honeywell HOA1885 series is a transmissive sensor designed with an infrared emitting diode facing an NPN silicon phototransistor. Encased in a black thermoplastic housing with IR transmissive inserts, it provides robust protection against ambient light and contaminants. The high-profile package elevates the optical centerline, minimizing interference from surrounding components. This sensor is commonly used in industrial automation, security systems, and object detection applications where reliable and protected optical sensing is required. The housing material is polycarbonate, which is soluble in chlorinated hydrocarbons and ketones. Cleaning is recommended with methanol and isopropanol.