01---Monday---Carbon Monoxide

Question 1

What is the specific Gravity?

Answer 1

0.97

Question 2

Electrochemical sensors suffer from cross contamination of which gasses?

Answer 2

hydrogen sulphide
hydrogen
ethylene

Question 3

What is the range of an electrochemical sensor for CO and how sensitive are they?

Answer 3

0PPM to 4000PPM sensitive to measure 1PPM

Question 4

What is the chemical symbol?

Answer 4

CO

Question 5

What is the legal limit of CO (Maximum Allowable Content in mine atmosphere)?

Answer 5

30PPM

Question 6

Present in normal atmospheres CO is usually produced in mines by?

Answer 6

Damps Afterdamp Whitedamp
Producer gases
Explosion
diesel exhausts, 
shot firing 
early stages of heating of coal

Question 7

What is the most explosive mixture of CO?

Answer 7

29%

Question 8

What is the formulae for degree of saturation of carboxyhaemoglobin?

Answer 8

b=4ate/100 where a is concentration of CO in PPM, t=time in hours e=1 at rest 2= walking 3= moderate work

Question 9

What is the half life of carboxyhaemoglobin?

Answer 9

4 to 5 Hours

Question 10

When CO burns in air it burns with what colour and what gas is formed?

Answer 10

Slight blue flame forms carbon dioxide.

Question 11

What detectors are the most common for CO

Answer 11

Detector tubes are most common.
taste
smell
electrochemical sensor

Question 12

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?

Answer 12

within 20%

Question 13

What is the nose point for CO?

Answer 13

6.1% O2 13.8 CO

Question 14

What are the characteristics for CO?

Answer 14

colourless
odourless
tasteless

Question 15

Physiological Effects of Carbon monoxide What are the percentages?
No apparent effect

Answer 15

30PPM

Question 16

Physiological Effects of Carbon monoxide What are the percentages?
Blood flow to organs increases people at risk with cardiovascular disease

Answer 16

50 PPM

Question 17

Physiological Effects of Carbon monoxide What are the percentages?
Visual impairment, judgement orvigilance

Answer 17

100PPM

Question 18

Physiological Effects of Carbon monoxide What are the percentages?
Tightness in forehead headache

Answer 18

200PPM

Question 19

Physiological Effects of Carbon monoxide What are the percentages?
Dizzyness general weakness in the legs nausea

Answer 19

400PPM

Question 20

Physiological Effects of Carbon monoxide What are the percentages?
Possible collapse disturbed judgement and speech

Answer 20

1200PPM

Question 21

Physiological Effects of Carbon monoxide What are the percentages?
Convulsions coma depressed pulse possible death

Answer 21

2000PPM

Question 22

Physiological Effects of Carbon monoxide What are the percentages?
Death possible

Answer 22

3000PPM

Question 23

Physiological Effects of Carbon monoxide What are the percentages?
Respiratory failure

Answer 23

10,000PPM

Question 24

How do the IR detectors work?

Answer 24

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