The DH500 duct housing is designed to sample air currents passing through a duct and allows the early detection of developing fire. The DH500 duct housing will accommodate either the intelligent ionisation sensor or the intelligent optical sensor, either of which provides continous analogue monitoring of the unit’s sensitivity. When sufficient smoke is sensed, an alarm signal is initiated at the control panel monitoring the detector, and appropriate action can be taken to shut off fans and blowers, change over air handling systems, etc. This can prevent the rapid distribution or isolation of toxic smoke and fire gases throughout the areas served by the duct system. The DH500 duct detector system features the superior capabilities of an intelligent sensor in a unit that is easy to install and maintain, making this duct detector the new industy standard. The twist-in, twist-out detector and base allow the removal of detectors easily and quickly for cleaning and maintenance. In addition, detector heads can be changed to fit the application without removing the duct housing. The DH500 comes with a built-in exhaust tube. Sampling tubes are available to fit ducts from 0.6M to 3M (1 to 10 feet) wide.

• Accommodates intelligent ionisation or optical detectors • Continous sensitivity monitoring and alarm verification from the panel • Simple change of detector heads: twist-in, twist-out • Easy and quick mounting to round or rectangular ducts • Outputs for remote test station (separate 24 Vdc is required) • Air velocity rating from 150 to 1200 metres per minute (500 to 4,000 feet per minute) • Clear polycarbonate cover for convenient visual inspection of sampling tube filters • Rugged Noryl® housing (mounting portion) • Three year limited warranty

mechanical Dimensions (HxWxD): 127 x 367 x 102 mm Weight: 1.1kg (2 lbs) Operating temperature: -10°C to 60°C Humidity: 10% to 93% non-condensing Air velocity: 150 to 1200 metres (500 to 4,000 feet) per minute electrical Operating voltage: 15 to 32 Vdc Current consumption: 200 μA at 24 Vdc 7 mA at 24 Vdc LED current nominal Terminals: SEMS screws with clamping plates for up to 2.5 mm2 (13 AWG) wire