Saturation of Haemoglobin with CO
- 0-10% - no symptoms
- 10-20% - tightness across the forehead
- 20-30% - flushed skin, headache, breathlessness and palpitation on exertion, slight dizziness
- 30-40% - severe headache, dizziness, nausea. Weakness of knees, irritability, impaired judgement. Possible collapse.
- 40-50% - symptoms as above with increased respiration and pulse rates. Collapse on exertion.
- 50-60% - loss of consciousness, coma.
- 60-70% - coma, weakened heart and respiration
- 70% and above - respiratory failure and death
Volume of CO in the Air
- 0.01% - tightness across the forehead with prolonged exposure
- 0.03% - flushed skin, headache, breathlessness and palpitation on exertion, with 4 to 5 hours exposure
- 0.05% - severe headache, nausea. Weakness of knees, irritability. Increased respiration and pulse rates and collapse within 4 to 5 hours exposure.
- 0.4% - coma, weakened heart and respiration within a few mins.
Carbon Monoxide Alarm(~£13; BS EN 50291)
- useful back-up precaution
- Complete Combustion - correct mixture (stoichiometric mixture) of gas and air
- (1m3 of methane + 8m3 of nitrogen + 2m3 of oxygen) = (1m3 of carbon dioxide + 8m3 of nitrogen + 2m3 of water vapor)
- Incomplete Combustion
- Retention Flames