Data Sheet  s Fire Safety & Security Products  Conventional Fire Detectors Thermal Fire Detectors Models DT-135R, DT-135F, DT-200R and DT-200F ARCHITECT AND ENGINEER SPECIFICATIONS • Listed • FM Approved Product Overview Specifications The Siemens Building Technologies ─ Fire Safety Rate-of-Rise Principle of Operation Division Thermal Fire Detectors are fixed The rate-of-rise element consists of an air temperature or a combination of fixed-temperature chamber; a flexible, metal diaphragm and a / rate-of-rise type. The combination detectors moisture-proof, trouble-free vent that is carefully consist of two, independently operated thermal calibrated. elements. The rate-of-rise element is self- It is well known air expands as it is heated, and restoring. However, the fixed temperature is of will contract as it is cooled. For normal, day-to- the non-restoring type. day fluctuations of temperature, the expansion Underwriter’s Laboratories, Inc., recommends the and contraction of the air within the chamber is combination-type thermal detector be used to automatically compensated by the ‘breathing’ protect a maximum of 2,500 square feet (50-foot action of the vent. spacing), and the fixed-temperature type be used However, when a fire occurs, air temperatures rise to protect a maximum of 625 square feet (25-foot very rapidly and the air in the chamber expands spacing). However, job conditions and faster than it can be vented. This creates a engineering judgment often dictate closer spacing pressure which distends the diaphragm and to provide faster detection. closes electrical contacts. The thermal fire detector shall be Fire Safety The rate-of-rise action is not related to any fixed Model ____ (insert number), and shall operate temperature level, but responds with the utmost at a temperature of ____°F (insert promptness when the rate of temperature rise temperature). The detectors shall be listed by exceeds 15°F per minute. If the heat is removed, Underwriters’ Laboratories, Inc. and Factory the air within the chamber contracts and the Mutual for use with Siemens Building switch moves to a normally open circuit position. Technologies, ─ Fire Safety Division systems. DT-series Thermal Fire Detectors 6130 s Industry, Inc. Building Technologies Division Installation Specifications ─ (continued) Each detector includes a thermoplastic, reversible Fixed Temperature Principle of Operation mounting plate. In one position, it easily attaches to In a slow-developing fire, the temperature may not a 4" octagon junction box, 3" octagon box or increase rapidly enough to operate a rate-of-rise plaster ring. element. Therefore, a fixed-temperature principle of In reverse, the plate can be used for open wiring operation is needed. 1 without a junction box. A /4" space between The detector utilizes a fixed-temperature element detector and mounting surface allows for wire made of fusible alloy and is of the non-restorable connections. All mounting screws are concealed. type. The detector simply attaches to the mounting The fusible alloy will melt and activate the detector plate with a push-and-twist motion ─ no tools when the surrounding air rises above the preset are required. level of 135°F or 194°F. The external heat collector drops away when the detector is activated therefore giving a quick visual confirmation that the detector has alarmed. Details for Ordering Notice: This marketing data sheet is not intended to be used for system design or installation purposes. For the most up-to-date information, refer to each product’s installation instructions. Fire Safety Fire Safety 2 Kenview Boulevard 8 Fernwood Road Florham Park, NJ 07932 Brampton, Ontario s Industry, Inc. June 2009 L6T 5E4 / Canada Tel: (973) 593-2600 [SII‐FS] Building Technologies Division Supersedes sheet dated 11/02 Tel: (905) 799-9937 FAX: (908) 547-6877 Printed in U.S.A. (Rev. 1) URL: www.SBT.Siemens.com/FIS FAX: (905) 799-9858