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3-in-1 Universal Smoke, Fire, and Carbon Monoxide Alarm. This 3-in-1 detector from Universal is on the cutting edge of fire, smoke, and carbon monoxide detection, packing advanced sensors that ...
Carbon monoxide detectors are just as important for ensuring health and wellness. Most homes use at least one gas burning appliance, including the furnace, water heater, dryer, or stove.
The primary purpose of CO detectors is to sound an alarm to warn occupants of an enclosed space of a dangerous level of carbon monoxide. The alarm should sound within 60 minutes if the concentration rises to 70 PPM, within 10 minutes at 150 PPM, in 4 minutes at 400 PPM, and immediately at 500 PPM or greater.
The key components are an infrared source, a light tube, an interference (wavelength) filter, and an infrared detector. The gas is pumped or diffuses into the light tube, and the electronics measure the absorption of the characteristic wavelength of light. NDIR sensors are most often used for measuring carbon dioxide. [2]
Before the development of electronic household carbon monoxide detectors in the 1980s and 1990s, carbon monoxide presence was detected with a chemically infused paper that turned brown when exposed to the gas. Since then, many electronic technologies and devices have been developed to detect, monitor, and alert the leak of a wide array of gases.
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