The Det-Tronics U5006 is obsolete and is replaced by the Det-Tronics Q5016 Duct Mount Accessory Kit.
Features
Trouble-free photoelectric operation
Standard 4-wire 24 Vdc operation (U5006)
Designed to meet ANSI/UL 268A smoke obscuration limits
600 to 4000 feet per minute airflow range
Rugged design for environmental extremes
Explosion-proof junction box with terminal board
Auxiliary relay
CSA approved, Class 1, Div 2.