Carbon monoxide detectors work in a similar way to smoke or fire alarms – they sound an alarm when carbon monoxide is detected in the air. It will go off before you even start sensing symptoms. If there’s fairly low carbon monoxide levels, around 50 parts per million (ppm), it could take up to 8 hours for the detector to sound an alarm. Does a Carbon Monoxide Detector Detect Natural Gas? In general, most carbon monoxide detectors will not detect natural gas, as they are different types of gas entirely. Also, most smoke detectors will detect carbon monoxide rather than natural gas. Again, this is because carbon monoxide is considered to be the greater threat. It was determined that lead batteries do not emit carbon monoxide. They do, however, emit hydrogen. It was also noted that carbon monoxide detectors will activate when exposed to high amounts of hydrogen. Hydrogen gas like carbon monoxide is a colorless and odorless gas. Kidde FireX Hardwire Smoke and Carbon Monoxide Detector at Amazon ($95) Jump to Review. Best for Kitchen: Jump to Review. Best for Garage: First Alert Hardwired Heat Alarm with Battery Backup at Amazon ($28) Jump to Review. Best for Hearing Impaired: Jump to Review. Carbon monoxide (CO) is a colourless, odourless, tasteless, poisonous gas produced by incomplete burning of carbon-based fuels, including gas, oil, wood and coal. Carbon-based fuels are safe to use. It is only when the fuel does not burn properly that excess CO is produced, which is poisonous. When CO enters the body, it prevents the blood from CO gas is always produced from the burning of fossil and carbon fuels. This includes gas, oil, coal and wood. These are usually safe to burn without causing any harm. But when the fuel doesn’t burn properly, it can produce carbon monoxide. One physical sign of this can be the flame burning yellow instead of blue on gas appliances. 4. Connect your sensor to your system. Follow the manufacturer's instructions to connect your motion sensor to your system. Most DIY systems walk you through this process, often using the main keypad or mobile app to set up and adjust your motion detectors. FEATURES. - Especially useful in homes with high risk of carbon monoxide leaks from appliances such as stoves, furnaces, and more. - Monitoring for carbon monoxide gas 24-7. - Test button to ensure device is operating correctly. - Built-in alarm sounds in addition to panel siren. - Causes panel to emit “fire” tone and alerts monitoring t65y6u.