Bosch D273 Photoelectric Smoke And Heat Detector is UL Listed and works with commercial fire protective signaling and household fire warning systems. Each model detects
smoke particles produced during wood, paper, and fabric combustion also.
Bosch D273 Photoelectric Smoke And Heat Detector use an infrared (IR) LED light source and a silicon photodiode to measure light in a chamber. A fine screen covers the chamber to deter insects and reduce dust accumulation and nuisance alarms. During a fire, smoke particles reflect light onto the photodiode. So, when the photodiode measurements exceed the alarm threshold, the detector signals an alarm condition after the alarm condition clears also. Similarly also interrupt power at the control panel to reset the detector. In conclusion, use smoke detectors for detection circuits that
protect people, in other words use heat detectors for circuits that protect property.
Chamber Calibration Tests
Check the sensitivity and calibration of any of these detectors using a visual check, a magnet test, or a voltage measurement test. Refer to the D263/D273 Families Installation Guide for specific instructions to perform these sensitivity tests.
The detector has a mounting plate that attaches to a standard four-inch back box. For commercial and industrial installations in accordance with NFPA 72, space each detector 30 ft
(9.2 m) apart.