MSA Altair 5X Mode D'emploi page 10

sensor and reduce its readings:
• Organic silicones
• Silicates
• Lead-containing compounds
• Sulphur compound exposures over 200 ppm or exposures over
50 ppm for one minute.
• The minimum concentration of a combustible gas in air that can
ignite is defined as the Lower Explosive Limit (LEL). A combustible
gas reading of "XXX" indicates the atmosphere is above 100 %
LEL or 5.00 %vol CH4, and an explosion hazard exists. Move
away from hazardous area immediately.
• Do not use the ALTAIR 5X, or ALTAIR 5X IR MultiGas Detectors to
test for combustible or toxic gases in the following atmospheres as
this may result in erroneous readings:
• Oxygen-deficient or oxygen-rich atmospheres
• Reducing atmospheres
• Furnace stacks
• Inert environments (only IR sensors acceptable for use)
• Atmospheres containing combustible airborne mists/dusts.
• Do not use the ALTAIR 5X or ALTAIR 5X IR MultiGas Detectors to
test for combustible gases in atmospheres containing vapors from
liquids with a high flash point (above 38 °C, 100°F) as this may
result in erroneously low readings.
• Allow sufficient time for unit to display the accurate reading.
Response times vary based on the type of sensor used (see
Section 5.3, "Sensor Performance Specifications"). Allow a
minimum of 1 second per foot
(3 seconds per meter) of sample line for the sample to be drawn
through the sensors.
• Sampling lines made from 0.062 inch (1.57 mm) inner diameter
tubing provide fast transport times to the instrument; however, they
must be limited to 50 feet (15 m) in length.
• Sampling of reactive toxic gases (Cl 2 , ClO 2 , NH 3 ) must only be
done with the reactive gas sample line and probe kits listed in the
Section 6.2 Accessories table.
• All instrument readings and information must be interpreted by
someone trained and qualified in interpreting instrument readings
in relation to the specific environment, industrial practice and
exposure limitations.
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