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Carbon Monoxide Detectors

What Are Carbon Monoxide Detectors, and How Do They Work?

By Travis Baugh

A carbon monoxide (CO) detector is a device designed to detect the presence of carbon monoxide gas in the environment and provide an alert when dangerous levels of CO are detected. Carbon monoxide is a colorless, odorless, and tasteless gas that can be lethal if inhaled in high concentrations, making CO detectors essential for safety in homes, workplaces, and other indoor environments. Learn more about the causes of carbon monoxide.

carrier dealer discusses CO alarms

How Does a Carbon Monoxide Detector Work?

A carbon monoxide (CO) detector is a device that senses the presence of carbon monoxide gas in the environment. Here's how it works:

Carbon Monoxide Alarm Mechanism

The detector continuously monitors the air for CO levels. If the concentration of CO exceeds a certain threshold, the detector activates an alarm (sound, light, or both) to alert occupants. Many detectors also display the CO concentration on a digital screen.

CO Detector Power Source

Several different power sources for carbon monoxide alarms exist. Carbon monoxide alarms can be battery-powered, plugged into the wall, or AC powered. CO detectors may also be combined with a smoke alarm. 

CO Alarm Features

CO alarms have a test/reset button which allows users to test the alarm and reset it after an activation. Some CO alarms have an end-of-life indicator which alerts when the detector needs to be replaced, typically after 10 years.

Carbon Monoxide Detector Importance

Carbon monoxide detectors are important for the following reasons. 
  • Health Protection: Provides early warning to prevent CO poisoning, which can cause headaches, dizziness, nausea, and even death.
  • Safety Assurance: Essential in homes with fuel-burning appliances, fireplaces, or attached garages to ensure the safety of occupants.
  • Peace of Mind: Offers reassurance that the air in the home is being monitored for this invisible, odorless threat.

Carbon Monoxide Alarm Maintenance

Follow the following steps to perform carbon monoxide alarm maintenance:
  • Regularly test the detector using the test button.
  • Replace batteries as needed. Some carbon monoxide alarms have a 10-year battery that lasts the life of the product.
  • Follow the manufacturer’s instructions for replacing the entire unit, usually every 10 years.

Steps To Test A Carbon Monoxide Detector

1. Read the Manual: Before testing, read the manufacturer's instructions specific to your model. This ensures you're following the correct procedure.
2. Locate the Test Button: Most CO detectors have a test button on the front or side of the unit.
3. Press and Hold the Test Button: Press and hold the test button for a few seconds. The alarm should sound, indicating the detector is working correctly. Some detectors may also flash lights or display a test message on a digital screen.
4. Check the Alarm Sound: Ensure the alarm is loud and clear. If the sound is weak or distorted, replace the batteries (if battery-operated) or check the power source.
5. Verify Digital Display (if applicable): If your CO detector has a digital display, verify that it shows a test message or the current CO levels during the test.
 

What Does A Carbon Monoxide Detector Look Like?

A carbon monoxide detector typically resembles a small, rectangular or round device that can be mounted on a wall or ceiling. Designs vary, but they are generally compact and straightforward in appearance.
Key features include:
  • Digital Display: Some models have a digital display showing CO levels.
  • Indicator Lights: Often include green (power), yellow (fault), and red (alarm) LED lights.
  • Test/Silence Button: A button to test functionality and silence false alarms.
  • Battery Compartment: May have a visible battery compartment if it's battery-operated.

Choose Carrier's Carbon Monoxide Alarm

Carrier’s carbon monoxide alarm monitors the current CO level in your home on a large, easy-to-read digital display. When dangerous levels of CO are present, a loud, audible alarm alerts you and your family automatically. This carbon monoxide detector updates every 15 seconds with the latest CO levels in your home, and when activated, makes a loud, pulsating sound at 85 decibels. The COALM plugs into any standard electrical outlet with a 10-year Lithium ion backup battery that does not need changing over the lifespan of the product.
 
Contact your local Carrier dealer for a carbon monoxide alarm and all of your HVAC and indoor air quality needs. A Carrier dealer can analyze your home and determine the best solution for you and your home.
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Frequently Asked Questions About CO Detectors

Evacuate the home and call 911 immediately and report that the alarm has gone off. Do not assume it is safe to reenter the home when the alarm has gone off. Learn more about what to do if a carbon monoxide detector goes off.

A carbon monoxide (CO) detector specifically detects the presence of carbon monoxide gas in the air. Carbon monoxide is a colorless, odorless, and tasteless gas that can be highly toxic and potentially fatal if inhaled in large amounts. 

A carbon monoxide detector should be installed on each level of the home and near an attached garage. Learn more on where to place a carbon monoxide detector.

Plugging in a CO detector on every level and in every bedroom is an excellent action to take to help protect your family. Follow up by creating an evacuation plan in case the alarm ever signals dangerous levels of CO in your home. Learn more on planning for carbon monoxide detection.
Yes, it is strongly recommended that all homes have functioning carbon monoxide detectors to alert you when there is an unhealthy level of carbon monoxide in the air. Discover more on do I need a carbon monoxide detector.
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