Notifier 302 Series - Manual

dn-1271:A1 • 12/23/08 — Page 1 of 2
302 Series
Rate-Anticipation Heat Detectors
Conventional Initiating Devices
dn-1271:A1 • I-307
General
The Thermotech 302 Series rate-anticipation heat detectors
operate within a controlled range of two to three degrees of
their set points, regardless of the speed or rate of temperature
rise. These detectors are available in either 135°F (57.2°C) or
194°F (90°C) ratings.
The 302 Series are normally-open devices designed espe-
cially for fire detection and alarm systems.
Features
• Immediate response. The 302 Series activate whenever
ambient air temperature reaches a detector’s setting, elimi-
nating the thermal time lag inherent in conventional heat
detectors.
• Eliminates false alarms. The 302 Series do not respond
to momentary temperature fluctuations below the selected
temperature.
• Universal application. The 302 Series can be used in all
areas for any type of occupancy.
• Self-restoring.
•
Hermetically sealed. Shock resistant, corrosion resistant,
and tamper-proof.
Principles Of Operation
The 302 Series rate-anticipation heat detectors respond and
activate the fire alarm immediately whenever the ambient tem-
perature reaches the preset temperature setting. Under rapid
heat rise conditions, the rate-anticipation feature enables the
detector to respond one to three degrees ahead of the setting.
At the same time, however, it does not respond to momentary
temperature fluctuations below the selected protection level,
thus eliminating false alarms. When temperature drops back
down below the protection level, the detector automatically
resets itself.
Dimensions (Model 302)
Total overall length: 4-1/8" (10.48 cm).
Base diameter: 2" (5.08 cm).
Electrical Ratings
Application Information
302 Series detector have a smooth ceiling UL rating of 50' x
50' (15.24 x 15.24 meters) and are the only type of heat detec-
tors having such a rating on both fixed temperature and rate
anticipation.
Agency Listings and Approvals
These listings and approvals apply to the modules specified in
this document. In some cases, certain modules or applications
may not be listed by certain approval agencies, or listing may
be in process. Consult factory for latest listing status.
• UL Listed: S539 (302-AW-135/-194; 302-ET-135/-194;
302-135-194)
• FM Approved: (302-AW-135/-194; 302-ET-135/-194;
302-135/-194)
• CSFM: 7270-0021:001
Voltage Current
6 - 125 VDC 5 amps
6 - 25 VDC 1 amp
125 VDC 0.5 amp
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Cut-Away View
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