The Potter CR-135-EWT is a combination rate-of-rise and fixed temperature detector in a cast aluminum housing suitable for use in the hazardous locations described above. A set of normally open contacts will close when the ceiling temperature increases at a minimum rate of 15°F (8.4°C) per minute. Furthermore, closing the contact initiates the direct 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 135°F (57°C).
When released, the plunger strikes the set of contacts and holds them closed. Also, spacing between detectors on an uninterrupted ceiling is 50 ft (15.2m) for the rate-of-rise and 30 ft. (9.1m) for the fixed temperature portion. Distance from any wall or partition is 25 ft. (7.5m) and 15 ft. (4.5m) respectively. Besides, a cast aluminum housing encloses a standard THERMOFLEX® heat detector making it suitable for use in hazardous locations including those requiring detectors that are explosion proof, water, and dust-tight.
Features / Specifications
- Low profile design
- Cast aluminum housing
- Single circuit with normally open contact configuration
- Explosion-proof, weatherproof, watertight, and dust-tight
- Dimensions: 5.5” (14 cm) x 3.6” (9.3 cm)
- Operating Temperature: -40°F (-40°C) – 250°F (120°C)