SELF CONTAINED BREATHING APPARATUS
In air, the overall content of oxygen is 21% and from this only 18% of oxygen is required for breathing. The oxygen meter is used to determine the % of oxygen in vessels or tanks or any confined area where risk lies, as those contains poisons, irritants, asphiants (increase of certain gases which leads to the decrease of oxygen)etc.,
Where oxygen content is very low, SCBA is required for normal breathing (but not applicable in fire intended areas.)
SCBA sizes vary according to durations like 15minutes, 30minutes, 45minutes, or 1 hour. A warning whistle is provided in SCBA, in case if the oxygen is at lower level, it blows automatically in order to ensure the safety of the wearer.
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