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System Sensor has unveiled its laser-based model 7251DH intelligent air duct smoke detector, the latest addition to the company’s high sensitivity detection line. The 7251DH detector is designed for interior duct applications where high velocity, high volume air changes require very early warning fire protection.
The high sensitivity duct smoke detector helps protect valuable assets and operations where systems must remain online at all times, such as telecommunications switching facilities, cellular telephone infrastructures, integrated circuit fabrication facilities, computer rooms, and clean rooms. These types of environments have many sensitive areas that require detection of the smallest particles of smoke.
The 7251DH detector uses a laser diode instead of a standard LED light source in the sensing chamber to detect sensitivities as low as 0.02 percent obscuration per foot. The intelligent laser smoke sensor resides in an efficient housing design that samples air currents passing through a duct. This enables the 7251DH detector to provide dependable performance for management of fans, blowers, and air conditioning systems.
System Sensor designed this high sensitivity duct smoke detector to satisfy NFPA 76, which requires very early warning fire detection in order to detect small incipient stage particles that could lead to fire conditions. A response in this early stage normally stops the impending fire before it reaches a destructive stage. At elevated air flows and in some other locations, the smoke does not have an opportunity to rise to ceiling-based detectors, making the detection of the air flow at return grilles a very important part of the smoke detection system.
Very early warning detection requirements for return air sampling require an air aspiration port or spot detector for every 4 square feet of return grille area. This often results in a cumbersome array of detection technology in vulnerable placement areas. Placing spot detection or air aspiration tubing in front of air handling equipment to monitor the air flow often creates issues with potential injury and/or equipment damage. It can also create interference with HVAC equipment maintenance if narrow aisles become partially obstructed.
The new System Sensor detector can be mounted easily to round or rectangular ducts from 1 to 12 feet (0.3 to 3.7 meters) wide. The twist-in, twist-out 7251DH high sensitivity laser smoke detector head allows easy removal for quick cleaning, maintenance and replacement without removing the duct housing.
Tags: HVAC
Posted in Commercial, Design and Installation, HVAC Monitoring, Spring 2008
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