280B-PL Series heat detectors offer fixed
temperature or combination rate-of-rise and
fixed temperature detection.
A temperature increase at the sensor of 15°F
(9°C) or more per minute activates the rate-of-rise
feature, closing 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.
If the temperature of the center disk rises to the
sensor’s rated temperature, the fixed temperature
element activates, closing 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.
Edwards 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 3 ½ 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
Features and Specifications:
• UL listed for 50 ft. (15.2m) 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.
• Operating temperature range: -22°F to 100°F
(-30°C to 37.8°C) (281B-PL and 283B-PL);
-22°F to 150°F (-30°C to 65.6°C) (282B-PL
Contacts – Rating Single Pole Normally Open 3.0 amps at 6 to 125 Vac; 1.0 amp at
6 to 24 Vdc; 0.3 amps at 125 Vdc; 0.1 amps at 250 Vdc.