The Siemens AD-3I Air Duct Dect. are design use with Series IL, ID-60, and Series 3 ionization or photoelectric detectors. Designed for installation directly to heating, ventilating, and air conditioning duct systems. The air duct detectors were not made to substitute open area detection. Air duct housings can be equipp with an optional relay.
The Siemens AD-3I Air Duct Dect. can be check-in place under actual dynamic airflow conditions using a sensitivity test module. Also, the sensitivity can be check-in place under actual dynamic conditions at the panel respectively, or may be printed by command on the optional printer.
Also, The detector unit employs a cross-sectional sampling principle of operation. In consequence, the sampling tubes are available in four lengths. An ongoing cross-sectional sample of the air to move through the duct.
The effects of laminar flow, stratification, or skin effect phenomena occurring in the duct that could prevent combustion products or smoke (especially in large ducts) from reaching a spot type detector.
In addition, the unique design of the sampling chamber ensures uniform sensitivity in air velocities.The detector shall also be available for applications in altitudes of 3000 to 8000 feet above sea level if desired.