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Fire Alarm Systems I D273 Photoelectric Smoke and Smoke and Heat Detectors <br /> Photoelectric Smoke • Smoke • <br /> Heat Detectors <br /> www.boschsecurity.com �oD BOSCH <br /> Invented for life <br /> ► 12 VDC or 24 VDC input <br /> ► Designed for commercial or residential use <br /> ► Four-wire application <br /> ► Light-emitting diodes (LEDs) indicate the status of <br /> the chamber, power, and alarm <br /> ► Removable terminal block to simplify wiring <br /> connections <br /> The D273 Family includes the following detector Sounders produce 85dBat10ft(3m). <br /> models: <br /> 2 The trouble relay indicates both Dirty Smoke Chamber and/or <br /> Model Description Power Loss conditions. <br /> D273 Four-wire Each of the detector models is UL Listed and works <br /> with commercial fire protective signaling and <br /> D2731S' Four-wire with an isolated 135°F(57°C)heat sensor household fire warning systems. Each model detects <br /> and sounder smoke particles produced during wood, paper, and <br /> D273TH Four-wire with 135°F(57°C)heat sensor fabric combustion. <br /> D273THC Four-wirewith 135°F(57°C)heat sensor and auxiliary System overview <br /> relay <br /> D273THCS' Four-wire with 135°F(57°C)heat sensor,auxiliary These detector models use an infrared (IR) LED light <br /> relay,and sounder source and a silicon photodiode to measure light in a <br /> chamber. A fine screen covers the chamber to deter <br /> D273THE Four-wire with 135°F(57°C)heat sensor and EOL insects and reduce dust accumulation and nuisance <br /> relay alarms. <br /> D273THR2 Four-wire with 135°F(57°C)heat sensor and trouble During a fire, smoke particles reflect light onto the <br /> relay photodiode. When the photodiode measurements <br /> D273THS' Four-wirewith 135°F(57°C)heat sensor and sounder exceed the alarm threshold, the detector signals an <br /> alarm condition. After the alarm condition clears, <br /> D273THES1 Four-wire with 135°F(57°C)heat sensor,sounder, interrupt power at the control panel to reset the <br /> and EOL relay detector. <br />