The D273 Series Detector models 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. When the photodiode measurements exceed the alarm threshold, the detector signals an alarm condition. After the alarm condition clears, interrupt power at the control panel to reset the detector. When a D132B Reversing Relay Module is used, the LED does not latch on alarm.
All products Barcode Discount sells are new (not used). Most products ship via our low cost flat rate shipping the same day your order is placed and can ship overnight to anywhere in the US. Our prices are amongst the best available anywhere. Buy online or call
1-800-485-3730 for a free review of your product needs by one of our knowledgeable product experts.