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THERMOFLEX® Heat Detectors
Conventional

Fire Detection Devices Ltd., is an all-Canadian company that manufactures a complete line of Fire Alarm Heat Detectors for the world market. The THERMOFLEX® product group includes standard detectors as well as detectors for hazardous locations and moisture proof applications. Each detector is available in single or multiple circuits with open and/or closed contact configurations. The prefix “CR” in the model number denotes rate-ofrise and  fixed temperature operation.  The prefix ‘CF” denotes fixed temperature only. The standard fixed temperature settings are 135º and 200º F. Units set at 165º F, and 285º F, are also available.

The Model CR 135  is a combination Rate-of-Rise and Fixed Temperature detector. A set of normally open contacts will close when the ceiling temperature increases at a (minimum) rate of 8.4 Celsius degrees (15 F. degrees) per minute. Closing the contacts initiates the fire alarm sequence. Independent of the rate-of-rise operation, the fixed temperature portion consists of a spring-loaded plunger retained by a fusible alloy that releases when the ceiling temperature reaches 57º C, (135º F). When  released, the plunger strikes the contacts and holds them closed. Spacing  on an uninterrupted ceiling is 70’ (22 m) for the rate-of-rise; 40’ (12.5 m) for Fixed Temperature portion.

The Model CF 135  is a Fixed Temperature Only detector. The fixed temperature portion consists of a spring-loaded plunger retained by a fusible alloy that releases when the ceiling temperature reaches 57º Celsius, (135 º F). When released, the plunger strikes a normally open set of contacts and holds them closed. Spacing on an uninterrupted ceiling is 40’ (12.5 m). The CF 135 is identified by a black dot on its heat collector fin .

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