Siemens AD2-4W

DescriptionModel AD2-4W from Siemens Industry, Inc., is an air duct monitoring housing containing sampling tubes. When used with a PE-11 smoke detector, smoke and combustion products are detected for shutdown of the duct system and/ or operation of supplementary equipment as provided by the system control panel.The duct unit supports two sets of Form C alarm contacts, one Form A alarm contact and one Form C trouble contact. The trouble contact supervises the presence of the input power, removal of the detector cover and the removal of the smoke detector head.