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Fire Alarm Systems I D285 Series Photoelectric Smoke Detector Heads (12/24 VDC) <br /> BOSk., <br /> Invented for Ii <br /> D285 Series Photoelectric Smoke <br /> Detector Heads (12/24 VDC) <br /> ► Commercial or residential applications <br /> MINA <br /> 111111.1111111 <br /> 1 �, ► Two-wire or four-wire application,depending on base <br /> ► Chamber Check rapid-flash LED sends contaminated <br /> chamber reports <br /> I I ► Flashing LED power indicator <br /> ► Steady-On LED alarm indicator <br /> hi ► Modular design <br /> The D285 and D285TH detector heads detect the large • D298M 24 V Four-wire Addressable(POPIT) Master <br /> smoke particles which typically result from wood, paper, Detector Base (6 in. [15.2 cm] diameter) <br /> and fabric combustion.The D285TH smoke detector also • <br /> D298S 24 V Four wire Addressable (POPIT) Slave <br /> has a+135°F (+57°C) fixed temperature heat sensor. Use Detector Base (6 in. [15.2 cm] diameter) <br /> in areas where the ambient temperature does not exceed <br /> +100°F (+38°C).These detectors are compatible with two- <br /> wire or four-wire,12 VDC or 24 VDC circuits.Also Functions <br /> available are addressable bases for use on the POPEX Detection chamber operation <br /> bus. The D285 and D285TH smoke detectors use an infrared <br /> These detectors have two components: the detector base (IR) LED light source and a silicon photodiode to measure <br /> and the detector head.The base is permanently attached light in a chamber. In normal conditions the light Is <br /> and wired to a back box.The Interchangeable heads absorbed in the chamber.The presence of a significant <br /> quickly detach for replacement and cleaning without number of particulates allows the light to reflect to the <br /> affecting circuit wiring.The D285 and D285TH detector photodiode.After three consecutive measurements <br /> heads attach to the following detector bases: exceeding the threshold level, the unit signals an alarm <br /> • D278S 12 V Four-wire Addressable (POPIT) Detector condition.The detector can be reset from the control <br /> Base (6 in. [15.2 cm] diameter) panel,after an alarm condition is cleared, by interrupting <br /> • D287 Two-wire Detector Base (5.5 in. [14 cm] power. <br /> diameter) The detection chamber, designed for reliable smoke entry <br /> • D288 Two wire Detector Base ([6 in. [15.2 cm] characteristics, is protected by a micro-fine insect screen <br /> diameter) <br /> • D292 Four-wire Detector Base (6 in. [15.2 cm] to reduce dust accumulation and insect penetration and <br /> diameter) minimize nuisance alarms. <br /> • D293A Four-wire Detector Base (6 in. [15.2 cm] <br /> diameter) with Form C Relay <br /> • D293E Power Supervision Detector Base (6 in. <br /> [15.2 cm] diameter) with Auxiliary Form A Relay <br /> • D293S Four-wire Detector Base (6 in. [15.2 cm] <br /> diameter) with Sounder <br /> www.boschsecurity.com <br />