Carbon Monoxide Detectors: How To Choose
- Dual power source. For maximum safety, choose a plug-in detector that runs off of AC power and also incorporates a 9-volt backup battery to provide protection in the event of brief power outages.
- Sensor type. CO detectors that utilize an electrochemical sensor are considered state of the art today. They are more reliable and accurate than the metal oxide semiconductor sensor included in older, less expensive units.
- UL certified accuracy. Most CO detectors come with a specification that expresses the unit’s accuracy in parts-per-million of detected carbon monoxide. If the carbon monoxide detector is certified by Underwriter’s Laboratories (UL), the unit’s accuracy has also been tested and verified by UL.
- End of life alert. Carbon monoxide detectors have a finite service life of 5 to 7 years. After that point, the unit is no longer reliable and must be replaced. Look for a detector that emits an audio alert when the time to replace the unit is approaching.
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