Kamis, 12 Desember 2013

At what level does carbon monoxide become dangerous?

carbon monoxide detector reads 0 on Review of Kidde 900-0235 Nighthawk Carbon Monoxide Alarm, Long Life AC ...
carbon monoxide detector reads 0 image



The Mrs.


After cooking on our new gas stove last night for approximately 30-45 minutes, my husband said that the carbon monoxide detector in our bedroom read a level of 15ppm. This is the highest we have seen it, generally speaking it doesn't go over 10ppm. At what point (in ppm) should we be concerned?


Answer
Any level of carbon monoxide is dangerous, it inhibits hemoglobin, myoglobin, and mitochondrial cytochrome oxidase (which are all VERY important!).

But typically, a concentration of as little as 0.04% (400 parts per million) carbon monoxide in the air can be fatal.

Below is a chart to help elaborate on the toxicity levels of CO and its symptoms:
* 35 ppm (0.0035%) Headache and dizziness within six to eight hours of constant exposure
* 100 ppm (0.01%) Slight headache in two to three hours
* 200 ppm (0.02%) Slight headache within two to three hours
* 400 ppm (0.04%) Frontal headache within one to two hours
* 800 ppm (0.08%) Dizziness, nausea, and convulsions within 45 minutes. Insensible within two hours.
* 1,600 ppm (0.16%) Headache, dizziness, and nausea within 20 minutes. Death in less than two hours.
* 3,200 ppm (0.32%) Headache, dizziness and nausea in five to ten minutes. Death within 30 minutes.
* 6,400 ppm (0.64%) Headache and dizziness in one to two minutes. Death in less than 20 minutes.
* 12,800 ppm (1.28%) Unconsciousness after 2-3 breaths. Death in less than three minutes.

In addition, a recent report concludes that carbon monoxide exposure can lead to significant loss of lifespan after exposure due to damage to the heart muscle.

How do carbon monoxide detectors work?




kyorge6293


I am trying to create a detector to see how much carbon monoxide is in a room. I am looking to find an specific average throughout a day, not just if the carbon monoxide level is too high.
By the way, I am doing a project on Indoor Air Pollution.
Thanks in Advance.



Answer
Most Carbon Monoxide detectors determine the amount of CO present in the air by using an electrolytic sensor. If the value is high, the alarm sounds.

There are digital CO detectors available which will read you the level on an LED number display. You can write down the numbers on the display at predetermined intervals and average them after 24 hours has passed. Most houses should read 0 all of the time. I've only seen mine say something other than 0 when I was working on the car in the garage and had it running for a couple minutes (with the garage door open although still allowed enough into the house to cause it to display, but not alarm). Take a look just past halfway down this page and you will see a couple models with a digital readout on them:

http://www.firstalert.com/CarbonMonoxideAlarmsCatalog.aspx




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