Description

Siemens 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 detect for shutdown of the duct system and/ or operation of supplementary equipment as provided by the system control panel. Also, 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.

The Siemens AD2 duct smoke detectors provide early detection of smoke and products of combustion present in air moving through an HVAC duct supply, return, or both. Besides, these devices come designed to prevent the recirculation of smoke in areas by the air handling system’s fans and blowers and may be use with fire alarm systems that shut down the complete air handling system in the event of smoke detection.

When the Siemens AD2-4W is operating; a sample of air is drawn from the duct and passed through the sampling chamber by means of the input sampling tube. The air sample passes through the smoke detector mounted in the duct housing and is exhaust back into the duct through the outlet tube.

Features / Specifications

• Temperature Range: 32°F (0°C) – 100°F (38°C) per UL 268A
• Altitude Range: No altitude limitations
• Relative Humidity: Up to 85% RH (non-condensing/non-freezing)
• Air Duct Velocity Range: 100-4000 ft/min
• Sampling and Exhaust Tube Pressure Differential Range: Greater than 0.01 and less than 1.2 inches of water column