Carbon monoxide detectors are triggered when high levels of CO are detected. The alarm is based on the level detected as well as the time that level was reached. The alarm gives you time to ventilate the area or safely leave your home. CO detectors do not serve as smoke detectors and vice versa. Only dual smoke/CO detectors serve both purposes.
A basic carbon monoxide detector typically costs about $40. Look for models with digital displays, which show relatively precise CO levels in parts per million (ppm) rather than simply beeping. Because of many false alarms with earlier models of CO detectors, the latest versions don’t sound unless the CO level exceeds 30 ppm for 30 days. They also warn you within four hours when they reach 70 ppm or within 15 minutes if the level reaches 400 ppm. The next generation of CO alarms will incorporate an end-of-life signal that will tell you when you need to replace the alarm.
Some basic models of detectors only display current ppm levels, while others display both current ppm levels and spikes over a period of time. The latter type of detector provides important information to emergency responders evaluating the level of past or ongoing exposure.
There are two types of CO detectors. Battery detectors are easier to install, but batteries must be changed at least once a year. Hardwired detectors plug into a standard 120-volt electrical outlet. Many of these types of models are available with backup batteries.
You can also incorporate CO alarms into your home security system. The alarm can then be heard inside and outside the house, and the central monitoring station will also receive a signal and can the proper authorities or call your cell phone.
Before buying a CO detector, consult with your local building department to see if it requires a specific type of CO alarm, for example hardwired. Also make sure the detector meets Underwriters Laboratories Standard 2034.
If you buy a battery detector, make sure to follow the manufacturer’s instructions for correct battery replacement, and adhere to its replacement schedule. Test your Co alarm once a month, and vacuum out dust and other debris that may collect on your CO detector as needed.
CO alarm warranties usually last no more than five years because carbon monoxide sensors lose sensitivity over time.
More about carbon monoxide detectors:
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