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The suffix EWT denotes a unit that is suitable for areas described as:
Applications requiring Special Purpose Enclosures Types III, IV and V, Weatherproof, Water-tight and Dust-tight. The Model 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 8.4 Celsius degrees (15 F. Degrees) per minute. Closing the contact 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 57 degrees Celsius, (135 degrees F). When released, the plunger strikes the set of contacts and holds them closed. Spacing between detectors on an uninterrupted ceiling is 50'(15.2m ) for the Rate-of-Rise; 30' (9.1 m) for Fixed Temperature portion. Distance from any wall or partition is 25' (7.5 m) and 15' (4.5 m) respectively. Note 1 : The designation "CF" in the model number denotes "Fixed Temperature Only" operation. The three-digit number following denotes the temperature at which the plunger is released ( 135, 165, 200 or 285 degrees F.), permanently operating the contacts. For Example: CF 200 EWT describes a detector that is Fixed Temperature Only, fusing at 200 degrees F., with one N/O contact, contained in an Explosion proof, Water (and dust) Tight enclosure. Note2: All Multiple Circuit detectors (see Spec sheet #3), are available as Hazardous Location detectors. Specify with the suffix EWT. For example: CR 135-2 EWT describes a detector that is a combination rate-of-rise and fixed temperature unit, fusing at 135 degrees F., with two N/O contacts, contained in an Explosion, Water (and dust) Tight enclosure.
After connections are made, the unit is re-assembled using the six machine-thread bolts provided. The black wires are solder-connected internally to one side of the contacts and the white wires are connected to the other side in the same way. Contact Rating: 3A @ 125 VAC * 1A @ 28 VDC * 0.3A @ 125 VDC 0.1A @ 250 VDC Dimensions: Diameter: 5.50" (14.0 cm) Height: 3.6" (9.2 cm) Weight: 1.7 lb. (800 gm)
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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.
The
EWT enclosure has two openings tapped for ½" rigid conduit. The unit
is fastened to the ceiling surface by means of two mounting holes that are
3/16" (5 mm) in diameter. Pigtail leads are provided for connection
to the Fire Alarm initiating circuit and/or any ancillary device.