Thermotech HEAT DETECTORS are of the rate compensation type, normally open, self-restoring and vertical mounting only. They are UL listed, FM approved and California listed for 50' x 50' areas. NOTE: Not for outdoor use or use in direct sunlight. Call the Sales Dept. for technical support.

Thermotech-194 Degree F All-Weather Heat Detector


FEATURES

  • Rate anticipation type. Eliminates false alarms: does not respond to momentary temperature fluctuations below the selected temperature.
  • Fixed temperature.
  • Hermetically sealed for moisture and dust proof installation.
  • Shock and corrosion resistant.
  • Tamperproof.
  • Automatically resets.
  • Normally open - designed especially for fire detection and alarm systems.
  • UL listed, FM approved and California State Fire Marshall.
  • Listing No. 7270-0021:001.

    SIZE
    LENGTH: 4 1/8"
    DIAMETER: BASE: 2"
    THREADS: 1/2" conduit threads for attachment to thread hub cover of Series JL fixture fitting as manufactured by Killark Electric Co.EACH DETECTOR SHOULD BE TIGHTENED BY HAND. The temperature setting of the detector could be damaged if it's too tight.
    RATINGS
    TEMPERATURE: TEMPERATURE RATING: 194° F
    MAXIMUM CEILING TEMPERATURE: 150° F
    ELECTRICAL: AMPERAGE:
    5 amps @ 6-125 VAC
    1 amp @ 6-25 VDC
    .5 amp @ 125 VDC

    SCOPE: AREA: Rated for 50' x 50' (by UL )
    APPLICATIONS
    LOCATION: Usually used for gas stations and some industrial applications.

    If the detector is to be used outdoors, it is recommended that a 194 F detector be used because of fluctuations in temperature that could trigger a lower rated detector (such as the ET135 ).

    If the detector is used indoors with a ceiling over 12 ft., a 135 F detector ( ET135 ) should NOT be used.

    In suppression systems, NFPA requires detectors to be cross zoned.

    PRINCIPLES OF OPERATION
    BACKGROUND: The detector operates on the principles of a rate compensation detector. The detector consists of a high expansion aluminum tube which encases two insulation struts with opposing open contact points. The high expansion sensing shell and the expansion struts have a different coefficient of thermal expansion . A slow rate of temperature rise allows the heat to penetrate the inner expansion struts. Therefore, the tubular shell and the struts expand slowly until the device reaches its rated temperature level. At that point, the silver contact points close and the alarm initiates.

    When subjected to a rapid rate of temperature rise, there is not as much time for heat to penetrate the inner strut. The rapid lengthening of the shell allows the struts to come together at a lower level which compensates for the thermal lag inherent in conventional detectors.

    When the surrounding air temperature goes below the rated temperature level, the shell contracts which forces the contacts to open, automatically resetting the detector.

  • Price: $47.95
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    Manufactured by Thermotech Heat Detectors


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