Data Sheet S85001 0589 Rate Compensation Heat Detectors Brochure

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Page 1 of 4 DATA SHEET S85001-0589

Not to be used for installation purposes. Issue 2

Edwards Signaling Catalog u Conventional Initiating

06-27-13

MEA

Rate Compensation

Heat Detectors

302 Series

Box mount Surface Mount

Overview

Series 302 heat detectors are designed for use in normal environ-

ments as well as environments where the detectors are subject to

weather, moisture (internal condensation), and explosive atmo-

spheres. They are normally-open devices designed to close an

electrical circuit upon activation. All models feature rate compen-

sation and are available with either 135 °F (57.2 °C) or 194 °F (90

°C) ratings. They are self restoring, hermetically sealed, shock and

corrosion resistant, and are tamperproof.

Standard Features

• Rate compensation offsets thermal lag

• Self-restoring – no manual reset required

• Explosion proof and weatherproof models available

• Weatherproof models available that do not require a special

backbox

• Box mount and surface mount models available

Application

Sensors rated at 135 °F (57.2 °C) will not respond to momentary

temperature fluctuations less than 30 °F/minute between 60 °F

(16 °C) and 100 °F (38 °C). Sensors rated at 194°F (90 °C) will not

respond to momentary temperature fluctuations less than 50 °F/

minute between 60 °F (16 °C) and 150 °F (66 °C). 302 Series sen-

sors should not be used in environments where conditions exceed

these parameters. Do not install them in hot air ducts, in front of

heaters, in paint booths that use heat to cure paint, or any other

location subject to temperature fluctuation.

Sensor’s Rated

Temperature

Minimum Ambient

Air Temperature

Maximum Ceiling

Temperature

135 °F (57.2 °C) -40 °F (-40 °C) 100 °F (38 °C)

194 °F (90 °C) -40 °F (-40 °C) 150 °F (66 °C)

The sensor's aluminum tube acts as a heat collector when sourc-

es of heat radiate directly on the tube. Install these sensors out of

direct sunlight and away from radiating heat sources including the

direct flow from heaters and heat ducts.

Page 2 of 4 DATA SHEET S85001-0589

Not to be used for installation purposes. Issue 2

Typical Wiring

Black

302 Series Detectors

White

End of

Line

Resistor

To control

panel or

next device

Electrical Rating

Voltage Current

6-125 VAC 5 amps

6-25 VDC 1 amp

125 VDC 0.5 amp

Maintenance

302 Series heat sensors are low maintenance. Sensors automati-

cally restore when temperatures drop below their rated tempera-

tures. The accumulation of dust and dirt does not normally affect

the sensors’ operation.

Testing

Testing for operation is simple and can be done before or after the

sensor has been installed. Heat the sensor with a hair dryer (do

not use any device with an open flame to test sensors). The sen-

sor should operate shortly after the hot air is applied.

Refer to NFPA 72, National Fire Alarm Code and/or the local

authority having jurisdiction to determine testing frequency, record

keeping, and other testing considerations.

Rate Compensation

302 Series sensors feature rate compensation, which improves

performance by offsetting thermal lag, an inherent property of

conventional fixed temperature heat sensors.

A slow rate of temperature rise allows the heat to penetrate the

inner expansion struts. The tubular shell and the struts expand

slowly until the total device has been heated to its rated tempera-

ture level of 135 °F (57.2 °C) or 194 °F (90 °C). At this point, the

silver contact points close and an alarm is initiated.

When subjected to a rapid rate temperature rise, there is not as

much time for heat to penetrate the inner strut. However, the rapid

lengthening of the shell allows the struts to come together at a

lower level.

When the surrounding air temperature returns to below the rated

level, the shell contracts, forcing the contacts to open, thus auto-

matically resetting the sensor.

Fine silver contact

Expansion struts

High expansion sensing

shell, 0.040 anodized aluminum

Heat control sleeve

Setting screw

Devcon hermetic seal

WARNING – Use For Property Protection Only: Heat detectors do not protect life against fire

and smoke. In most fires, hazardous levels of smoke, heat and toxic gases can build up before a

heat sensor would initiate an alarm. Independent studies indicate that heat sensors should only

be used when property protection alone is involved. In cases where life safety is a factor, the use

of smoke detectors is recommended.

Under no circumstances should heat detectors be relied upon as the sole measure to ensure fire

safety. However, if they are spaced in accordance with the specifications found under Application,

these sensors can contribute, within an overall fire safety program, to reducing the risk of avoid-

able property losses.

When used with automatic fire suppression systems such as pre-action and deluge sprinkler

systems, carbon dioxide systems, halon systems, and dry chemical systems, at least two sen-

sors should be used to initiate the alarm. This is commonly referred to as cross-zoning or priority

matrix zoning and is necessary to eliminate premature discharge of the system. Refer to NFPA 72

for more information.

Detector Spacing

Model 302 302-AW 302-ET 302-EPM

UL- Vertical Spacing

(all models)

50' x 50'

(15.2 x 15.2 m)

50' x 50'

(15.2 x 15.2 m)

50' x 50'

(15.2 x 15.2 m)

40' x 40'

(12.2 x 12.2 m)

UL- Horizontal Spacing

(all models)

40' x 40'

(12.2 x 12.2 m)

40' x 40'

(12.2 x 12.2 m)

40' x 40'

(12.2 x 12.2 m)

30' x 30'

(9.1 x 9.1m)

FM - Horizontal

or vertical spacing.*

30' x 30'

(9.1 x 9.1m)

30' x 30'

(9.1 x 9.1m)

30' x 30'

(9.1 x 9.1m) Not Listed

Spacing is based on smooth ceilings that are up to 10' (3 m) high. Refer to NFPA 72 for ceilings that are not considered smooth or are higher than 10' (3

m).

* EPM models are not FM approved.

Dimensions

Model ET EMP

Tube Length 3" (76.2 mm) 3" (76.2 mm)

Tube Diameter 0.5" (12.7 mm) 0.5" (12.7 mm)

NPT Thread 0.5" (12.7 mm) 0.5" (12.7 mm)

Hex Base 1" (25.4 mm) plastic 1.25" (31.75 mm)

brass

Page 3 of 4 DATA SHEET S85001-0589

Not to be used for installation purposes. Issue 2

Ordering Information

Interior applications Ship Wt.

302-135

Heat Detector - Rate Compensation, Interior

Vertical Surface Mount FM & UL, 135 °F (57.2

°C)

For interior mounting. 0.2 lb. (0.09

kg)

302-194

Heat Detector - Rate Compensation, Interior

Vertical Surface Mount FM & UL, 194°F (90

°C).

Moisture & dust proof applications Ship Wt.

302-AW-135

All-weather Heat Detector - Rate

Compensation, Vertical Mounting FM & UL,

135 °F (57.2 °C)

Hermetically sealed for moisture proof

or dust proof installations. Requires no

special back box when the all-weather

leads are properly spliced to “THW”

or equivalent type wire and splices are

moisture proof. For indoor or outdoor

use.

0.2 lb. (0.09

kg)

302-AW-194

All-weather Heat Detector - Rate

Compensation, Vertical Mounting FM & UL,

194°F (90 °C)

Moisture & dust proof applications (box mount) Ship Wt.

302-ET-135

All-weather Heat Detector - Rate

Compensation, Vertical, Box Mount (½"

NPT), FM & UL, 135 °F (57.2 °C). Requires

STONCO27 or equivalent.

Hermetically sealed for moisture proof

or dust proof installations. Requires no

special back box. Has plastic hexagonal

grip bushing with ½" conduit threads

for attachment to threaded hub cover,

or any outlet box. For indoor or outdoor

use when watertight seal is required,

use weatherproof box.

0.2 lb. (0.09

kg)

302-ET-194

All-weather Heat Detector - Rate

Compensation, Vertical, Box Mount (½"

NPT), FM & UL, 194°F (90 °C). Requires

STONCO27 or equivalent.

Explosion proof applications Ship Wt.

302-EPM-

135

Heat Detector - Rate Compensation,

Explosionproof Mounting UL (Not FM

approved), 135 °F (57.2 °C). RequiresJALX-11

or equivalent

Explosion proof for installation in

hazardous locations. Has hexagonal

grip bushing with ½" conduit threads for

attachment to threaded hub covers of

series JL fixture fitting manufactured by

Killark Electric Co., or equivalent. Must

be hand tightened only. For indoor use

only.

0.3 lb. (0.14

kg)

302-EPM-

194

Heat Detector - Rate Compensation,

Explosionproof Mounting UL (not FM

approved), 194°F (90 °C). RequiresJALX-11

or equivalent.

Adapter plate Ship Wt.

AP-P Decorative white plastic adaptor plate for mounting 302 and 302-AW to any 3" outlet box

or 4" octagon outlet box.

0.1 lb. (0.05

kg)

Outlet body Ship Wt.

STONCO27 3 ½" Weatherproof, round backbox and cover (½" thread hubs back, four sides and cover) 3.0 lb. (1.4 kg)

Explosion proof outlet body Ship Wt.

JALX11 Explosion proof outlet body with cover (½" thread hubs back, four sides and cover) - Killark 3.5 lb. (1.6 kg)

Page 4 of 4 DATA SHEET S85001-0589

Not to be used for installation purposes. Issue 2

06-27-13

Contact us...

Phone: 1-800-336-4206

Web: www.edwardssignaling.com

Edwards Signaling is

an EDWARDS brand.

3 Farm Glen Boulevard

Farmington, CT 06032

In Canada, contact Chubb Edwards...

Email: inquiries@chubbedwards.com

Web: www.chubbedwards.com

© 2013 UTC Fire & Security Americas

Corporation, Inc. All rights reserved.

Specifications subject to change

without notice. Edwards is part of UTC

Climate, Controls & Security, a unit of

United Technologies Corporation.