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, t <br /> Product Overview— (continued) Profile Overview <br /> Each detector consists of a dust-resistant photoelectric Model FDOT421 provides two(2)different alarm sources <br /> chamber;a solid state,non-mechanical thermal sensor,and that can be selected individually(ON or OFF)by the FACP. <br /> microprocessor-based electronics with a low-profile plastic Alarm Source 1 (Neural Network)–Combines smoke–heat <br /> housing. Every Model FDOT421 fire detector is shipped with with the following selectable profiles: <br /> a protective dust cover: •Sensitive <br /> 1) Models ~ --� • Robust <br /> deetoctor' 7--- <br /> •Standard <br /> QQ ~ Sensitive: This parameter set is practically suitable for <br /> t>_ _ areas where few misleading sources of false alarm are <br /> 4--�"�" , -- ;2) Dust cover present,and is appropriate where priority is given to <br /> --�• r (provided with detecting open fires as soon as possible(e.g.–typically a <br /> l� \I • each detector) <br /> �, - © clean application with controlled environmental conditions.) <br /> `-~ I Robust:This parameter set offers improved resistance to <br /> false alarms in areas where misleading sources,such as <br /> Operation cigarette smoke or exhaust fumes,may cause a nuisance <br /> Model FDOT421 utilizes an infrared light emitting diode alarm. <br /> (IRLED),and infrared light-sensing photodiode. Under Standard:This parameter set is practically apt for normal <br /> normal conditions,light transmitted by the LED is directed office,hotel lobby type applications and is the default <br /> away from the photodiode and scattered through the smoke setting. <br /> chamber in a controlled pattern. <br /> Alarm source 2(Thermistor)–Heat only,provides the <br /> The smoke chamber is designed to manage light dissipation following: <br /> and extraneous reflections from dust particles or other non- <br /> • Static I fixed at 135°F(57°C),default setting <br /> smoke,airborne contaminants in such a way as to maintain • Rate-of-Rise Detection: 15°F I min.(8.3°C I min) <br /> stable,consistent detector operation. When smoke enters <br /> the detector chamber,light emitted from the IRLED is If the detector is not programmed,Model FDOT421 will <br /> scattered by the smoke particles,and is received by the default to a'standard'profile setting,which allows operation <br /> photodiode. for a normal office-type environment. <br /> Model FDOT421 also utilizes a modern,accurate and shock- Model FDOT421 contains a tri-color LED indicator,capable of <br /> resistantthermistorto sense temperature changes. flashing any one(1)of three(3)distinct colors: GREEN, <br /> The signal processing with detection algorithms allows the YELLOW,or RED. During each flash interval,the <br /> detector to first gather smoke and thermal data,and then microprocessor based detector monitors the following: <br /> analyze this information in the detector's'neural network.' •Smoke in its sensing chamber <br /> By comparing data received with the common • Smoke sensitivity is within the range indicated on <br /> the nameplate label <br /> characteristics of fires or fire signatures,Model FDOT421 can • Internal sensors and electronics <br /> compare these signals to those of deceptive phenomena Based on the results of the monitoring,the LED <br /> that cause other detectors to false alarm. indicator flashes the following: <br /> �" \. Flash <br /> Flash <br /> t y `, -5, Color Condition Interval <br /> ,r = - <br /> t .r ► kr, .F'� (in seconds) <br /> 4 <br /> ( o -, �J l " t' •. Normal supervisory operation. <br /> 4,01;-{' \ Green': Smoke sensitivity is within 10 <br /> \ 0 _ rated limits. <br /> 1} Labyrinth 4) Heat sensor Yellow: Detector is in trouble and 4 <br /> 2) Optical transmitter needs replacement. <br /> 3) Optical receiver Red: Alarm condition. 1 <br /> Each Model FDOT421 detector provides three(3)pre- No Flash: Detector is not powered. — <br /> programmed parameter sets that can be selected by the fire `LED can be turned OFF. <br /> alarm control panel. Please follow the corresponding description of the panel used. <br /> '� a <br /> �SIEMENS Industry, Inc. 1 <br /> Building Technologies Division VI <br />