Fire Alarm Heat Detector Thermotech Model 302 US Made

The Thermotech Heat Detector Model 302 is a normally opened device designed especially for fire detection and alarm systems. These rate compensation type detectors are available in 135F or 194F ratings. Its self restoring, hermetically sealed, shock & corrosion resistant plus its shock proof. For industrial application in boiler, machine rooms etc. This device is connected to the Fire Alarm Control Panel serving as a initiating device.

Principal of Operation:

The Model 302 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 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 total device has been heated to its rated temperature level of 135°F./194°F. At this point, the silver contact points close which initiates the alarm. When subjected to a rapid rate 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 thermal lag inherent in conventional fixed temperature detectors. When the surrounding air temperature goes below the rated temperature level, the shell contracts which forces contacts to open, thus automatically resetting the detector.

Special Considerations

Detectors have a smooth ceiling UL rating of 50' x 50' (2500 sq. ft.). Detectors, hub covers, or outlet boxes must never be installed in direct sunlight. Refer to NFPA STANDARD 72for spacing and other considerations.

Electrical Rating

We design, supply, install Fire Alarm System package for buildings, Factories & residential. Special application Heat, smoke detectors also available & we manufacture Fire Hose Cabinet, Bank Security Foot Switch Alarm,Security Siren Box w/ tamper switch. Call 890-31-23, 890-35-14, fax 8903515 for details or Email : pyrgard  at gmail.com