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For use in hazardous locations A. General - The 302 series automatic heat detector is designed for fire detection with alarm systems. Thermotech detectors are normally open devices and are "rate compensation type" detectors. All four models are self-restoring, hermetically sealed, shock and corrosion resistant, nonferrous, and tamperproof. B. Principles of Operation - The Model 302 operates on the principles of a rate compensation detector. The detector consists of a high expansion aluminum tube that encases two insulated struts with opposing open contact points. The high expansion sensing shell and the expansion struts have a different coefficient of expansion. This allows the detector to react to changes in temperature in the following two ways: Slow Rate of Temperature Rise - A slow rate of temperature rise allows the heat to penetrate the inner expansion struts. As the temperature rises, the tubular shell and the struts both expand until the total device has been heated to the rated temperature. At this point, the silver contact points close which initiates the alarm. http:// /refguide.html FREE scheduling, supersized images Smart Services for Smart Sellers FREE scheduling, supersized images (New thermotech 302-epm fire alarm heat detectors,4EACH is the responsibility of Hazel Weeks) |
HWeeks@cedar--rapids.com (Hazel Weeks) for more information.