01---Monday---Carbon Monoxide Flashcards
What is the specific Gravity?
0.97
Electrochemical sensors suffer from cross contamination of which gasses?
hydrogen sulphide
hydrogen
ethylene
What is the range of an electrochemical sensor for CO and how sensitive are they?
0PPM to 4000PPM sensitive to measure 1PPM
What is the chemical symbol?
CO
What is the legal limit of CO (Maximum Allowable Content in mine atmosphere)?
30PPM
Present in normal atmospheres CO is usually produced in mines by?
Damps Afterdamp Whitedamp Producer gases Explosion diesel exhausts, shot firing early stages of heating of coal
What is the most explosive mixture of CO?
29%
What is the formulae for degree of saturation of carboxyhaemoglobin?
b=4ate/100 where a is concentration of CO in PPM, t=time in hours e=1 at rest 2= walking 3= moderate work
What is the half life of carboxyhaemoglobin?
4 to 5 Hours
When CO burns in air it burns with what colour and what gas is formed?
Slight blue flame forms carbon dioxide.
What detectors are the most common for CO
Detector tubes are most common.
taste
smell
electrochemical sensor
These work by drawing a measured volume of air through a glass tube containing chemicals which will change colour in the presence of the gas to be detected - the length of the stain is directly related to the percentage of the gas in the sample. They do not require Calibration to give accurate results. How accurate are they?
within 20%
What is the nose point for CO?
6.1% O2 13.8 CO
What are the characteristics for CO?
colourless
odourless
tasteless
Physiological Effects of Carbon monoxide What are the percentages?
No apparent effect
30PPM
Physiological Effects of Carbon monoxide What are the percentages?
Blood flow to organs increases people at risk with cardiovascular disease
50 PPM
Physiological Effects of Carbon monoxide What are the percentages?
Visual impairment, judgement orvigilance
100PPM
Physiological Effects of Carbon monoxide What are the percentages?
Tightness in forehead headache
200PPM
Physiological Effects of Carbon monoxide What are the percentages?
Dizzyness general weakness in the legs nausea
400PPM
Physiological Effects of Carbon monoxide What are the percentages?
Possible collapse disturbed judgement and speech
1200PPM
Physiological Effects of Carbon monoxide What are the percentages?
Convulsions coma depressed pulse possible death
2000PPM
Physiological Effects of Carbon monoxide What are the percentages?
Death possible
3000PPM
Physiological Effects of Carbon monoxide What are the percentages?
Respiratory failure
10,000PPM
How do the IR detectors work?
Most (if not all) are of the Infra-red type which work by passing a beam of infra red radiation through the air being tested. The amount of radiation absorbed by the gas is measured and related to the presence of the gas to be detected. This type of analyser is generally very accurate and reliable
