Carbon Monoxide (CO) is an invisible, odorless, tasteless gas produced by incomplete combustion. Any fuel burning appliance, vehicle, tool or other device has the potential to produce dangerous levels of Carbon Monoxide gas.
See Table 1 for a list of some of the items that produce CO.
It kills thousands of people each year, and injures many more. Since you cannot see, taste, or smell CO, a Carbon Monoxide detector is the only way to alert you to increasingly dangerous levels of CO before tragedy strikes.
Carbon Monoxide, like Oxygen, enters the body through the lungs during the normal breathing process. However, CO competes with oxygen. CO combines with red blood cells approximately 300 times easier than oxygen does. Therefore, it blocks the oxygen from your body over a period of time and if concentrations get high enough, CO can kill you in minutes. It takes approximately 5 hours for the levels of CO attached to the Blood cells to be reduced to 50%.
The symptoms vary widely based upon exposure levels, duration and the general health and age of the individual. You will notice one recurring theme that is most significant in recognizing Carbon Monoxide poisoning. That is the presence of a headache, dizziness and nausea. This flu like symptom is often mistaken for a real case of the flue and can result in a delayed or misdiagnosed treatment. Table 2 will show some of the breakdowns for CO symptoms.
Common CO producing devices. |
Automobiles |
Fuel fired furnaces (non-electric) |
Fireplaces and Woodstoves |
Gas Stoves |
Gas Dryers |
Gas Water Heaters |
Here is a breakdown of CO Parts per Million (PPM) and their effect upon a typical adult male.
PPM CO | Elapse Time | Symptoms |
35 PPM | 8 hours | The maximum allowed exposure for a continuous exposure in any 8-hour period. |
200 PPM | 2-3 hours | Mild headache, fatigue, nausea and dizziness. |
400 PPM | 1-2 hours | Serious headache - other symptoms intensify. Life threatening after 3 hours. |
800 PPM | 45 minutes | Dizziness, nausea and convulsions. Unconscious within 2 hours. Death within 2-3 hours. |
1600 PPM | 20 minutes | Headache, dizziness and nausea. Death within 1 hour. |
3200 PPM | 5-10 minutes | Headache, dizziness and nausea. Death within 1 hour. |
6400 PPM | 1-2 minutes | Headache, dizziness and nausea. Death within 25-30 minutes. |
12,800 PPM | 1-3 minutes | Death. |
Table 2
How CO detectors work:
On today's market there are many different types and brands of Carbon Monoxide detectors. However, they can generally be characterized by whether they operate on household current or batteries. Detectors using household current typically use some type of solid-state sensor, which purges itself and resamples for CO. Detectors powered by batteries typically use a passive sensor that reacts to the prolonged exposure to Carbon Monoxide gas. Table 3 describes some of the Advantages/Disadvantages of both types of detectors.