Heat Detectors-Conventional, Non-Restoring

280B-PL Series heat detectors offer fixed temperature or combination rate-of-rise and fixed temperature detection.

RATE-OF-RISE: A temperature increase at the sensor of 15°F (9°C) or more per minute activates the rate-of-rise feature. This closes the contacts in the sensor to transmit the alarm condition to the fire alarm control panel. When the rate-of-rise element alone has been activated, the sensor is self-restoring.

FIXED TEMPERATURE: If the temperature of the center disk rises to the sensor’s rated temperature, the fixed temperature element activates. This closes contacts in the sensor and transmits an alarm condition to the fire alarm control panel. The fixed temperature element is non-restorable and, when activated, the detector must be replaced. The need for replacement is indicated when the center disk has fallen free from the detector .

The 280B series heat sensors come standard with a white plastic reversible mounting plate. The plate is designed for surface or flush mounting and installs directly to a standard North American 3½ or 4 inch octagon box. Once the mounting plate is fixed, a simple twist will lock the sensor in place. It can be removed using a screwdriver to release the tamper-resistant locking finger. This helps prevent unauthorized removal.  The optional metal mounting plate has four legs that can be bent up to accommodate exposed wiring using limited energy cable (280A-MPL).

Standard Features

• UL listed for 50 ft. (15.2 m) spacing
• Single pole — normally open contact
• Low profile with mounting plate
• Pure white finish
• Mounting flexibility with screw terminals
• Easy twist-on installation
• On-site testing of rate-of-rise feature
• Positive operating indication — for fixed temperature element
• Agency Listings: UL, FM, CSFM, MEA