Air quality test instruments
Sone environment will need to be tested before a job could be done. Let’s take for instance a confined space. In Cananda, we define a confined space as a place:
1. which is not designed to be occupied by
people, but who can be occasionally
for the execution of a job;
2. which can not be accessed or
can come out only through a narrow passage;
3. which may pose health risks and
the safety or physical integrity of anyone
(a) its location, design or
of its construction,
(b) the ambient atmosphere or a
lack of natural ventilation or
(c) substances or substances
that it contains,
(d) other related hazards.
Before entering this zone. A worker should test the air at different heights in the confined space (silo, tank, etc). The air quality tester should be able to read the oxygen level, the carbon monoxide level, hydrogen sulfide (H2S) and other lower Explosive Levels (LEL) of a variety of combustible gases.
A gas that is vital for the humans is obviously oxygen:
|Concentration of Oxygen||Consequences for a human being|
|23%||Atmosphere enriched with oxygen.
Upper limit from which it is forbidden to enter an enclosed space.
|20.9%||Normal concentration of oxygen. No effect.|
|19.5%||Minimum concentration to enter an enclosed space without a respirator|
stand alone or with a supply air respirator with air supply. No effect./td>
|From 12% to 16%||Insufficient oxygen content to keep a flame burning.
Jerky breathing, anxiety, abnormal tiredness when doing movements.
|From 10% to 11%||Acceleration of breathing and heart rate, euphoria, headache.|
|From 6% to 10%||Nausea and vomiting, inability to move freely, possibility of loss of
consciousness and collapse while remaining conscious.
|Less than 6%||Respiratory arrest followed by cardiac arrest; dead in minutes.|