Thermotech 302-ET-135 Weatherproof Heat Detector

Thermotech 302-ET-135

A rate compensation heat detector. Each Thermotech 302-ET-135 model i s a normally open device. Designed for fire detection and alarm systems. These rate compensation type detectors ar e available in 135°F or 194°F ratings. All four basic models come self-restoring, hermetically sealed, shock and corrosion-resistant, and a re tamper-proof.

All models operate on the principles of rate compensation detectors. The detector consists of a high-expansion aluminum tube. That encases two insulation struts with opposing open constant points. The high expansion sensing shell and the expansion struts have a different coefficients of expansion. A slow rate of temperature rise allows the heat to penetrate the inner expansion struts.

Detectors have a smooth ceiling UL rating of 50’ x 50’ (2500 sq. ft.) on 8 to 10 ft. ceilings. Detectors, hub covers, or outlet boxes must never b e installed in direct sunlight. Refer to NFPA Standard 72 for spacing and other considerations.

Features / Specifications

Hermetically sealed and explosion-proof options

Horizontal or vertical mounting ability

Select models available for indoor and outdoor use

Aluminum tubing with silver contact points

Thermotech 302-ET-135

A rate compensation heat detector. Each Thermotech 302-ET-135 model i s a normally open device. Designed for fire detection and alarm systems. These rate compensation type detectors ar e available in 135°F or 194°F ratings. All four basic models come self-restoring, hermetically sealed, shock and corrosion-resistant, and a re tamper-proof.

All models operate on the principles of rate compensation detectors. The detector consists of a high-expansion aluminum tube. That encases two insulation struts with opposing open constant points. The high expansion sensing shell and the expansion struts have a different coefficients of expansion. A slow rate of temperature rise allows the heat to penetrate the inner expansion struts.