September 28, 2000 DN-1271 I-307
302 Series
Rate-Anticipation Heat Detectors
Section: Conventional Initiating Devices
GENERAL
California
The Thermotech 302 Series rate-anticipation heat detec- State Fire
tors operate within a controlled range of two to three de- Marshal
grees of their set points, regardless of the speed or rate of 7270-0021:001
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 es- S539
pecially for fire detection and alarm systems. E35018A
(EPM model only)
FEATURES
Approved
Immediate response. The 302 Series activate when- (Except EPM)
ever ambient air temperature reaches a detectors set-
ting, eliminating the thermal time lag inherent in conven-
tional heat detectors.
Eliminates false alarms. The 302 Series do
not respond to momentary temperature fluctua-
tions below the selected temperature.
Universal application. The 302 Series can be
used in all areas for any type of occupancy.
Model 302
Self-restoring. Model 302-AW
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 temperature reaches the
preset temperature setting. Under rapid heat rise
conditions, the rate-anticipation feature enables Model 302-EPM Model 302-ET
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. Model 302-H
DIMENSIONS (Model 302)
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Total overall length: 4-1/8" (10.48 cm).
Base diameter: 2" (5.08 cm).
ELECTRICAL RATINGS APPLICATION INFORMATION
Voltage Current 302 Series detector have a smooth ceiling UL rating of 50'
6 125 VAC 5 amps x 50' (15.24 x 15.24 meters) and are the only type of heat
detectors having such a rating on both fixed temperature
6 25 VDC 1 amp and rate anticipation. The 302-H is designed for horizontal
125 VDC 0.5 amp mounting and is UL rated for 40' x 40' (12.19 x 12.19
meters).
This document is not intended to be used for installation purposes. We try to keep our
product information up-to-date and accurate. We cannot cover all specific applications or
anticipate all requirements. All specifications are subject to change without notice. For
more information, contact NOTIFIER. Phone: (203) 484-7161 FAX: (203) 484-7118
12 Clintonville Road, Northford, Connecticut 06472
DN-1271 09/28/00 Page 1 of 2
PRODUCT LINE INFORMATION
Thermotech Model 302 Series Rate-Anticipation Heat Detectors
MODEL NUMBER DESCRIPTION R E FE R TO
302-135 135°F Interior Vertical Mounting.
Note 1 below.
302-194 194°F Interior Vertical Mounting.
302-AW-135 135°F All-Weather Vertical Mounting.
Note 2 below.
302-AW-194 194°F All-Weather Vertical Mounting.
302-ET-135 135°F All-Weather Vertical Mounting.
Note 3 below.
302-ET-194 194°F All-Weather Vertical Mounting.
302-H-135 135°F Interior Horizontal Mounting.
Note 4 below.
302-H-194 194°F Interior Horizontal Mounting.
302-EPM-135 135°F Explosion-Proof Mounting.
Note 5 below.
302-EPM-194 194°F Explosion-Proof Mounting.
AP-P Decorative white plastic adaptor plate for mounting 302
and 302-AW to 4" outlet box.
1271t1.tbl
Note 1: For interior mounting in any atmosphere that is com-
1271dia1.tif
patible with terminal-screw-type connections. UL
rating 50' x 50' (15.24 x 15.24 meters).
Note 2: Humitically sealed for moisture-proof or dust-proof
installations. Requires no special backbox when the
all-weather leads are properly spliced to THW or
equivalent type wire.
Note 3: Humitically sealed for moisture-proof or dust-proof
installations. Requires no special backbox. Has
plastic hexagonal wrench grip bushing with 1/2 (1.27
cm) conduit threads for attachment to threaded hub
cover, or any outlet box.
Note 4: Same as model 302 except designed for horizontal
mounting. UL rating 40 x 40 (12.19 x 12.19 meters).
Note 5: Explosion-proof for installation in hazardous locations.
Has hexagonal wrench-grip bushing with 1/2 (1.27
cm) conduit threads for attachment to threaded hub
cover of Series JL fixture fitting as manufactured by
Killark Electric Co., or equal.
Cut-Away View, ACTUAL SIZE
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