MSA ALTAIR 4 Operating Manual page 7

MSA
• 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 CH
Move away from hazardous area immediately.
• Do not use the ALTAIR 4 Multigas Detector 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
• Atmospheres containing combustible airborne mists/dusts.
• Do not use the ALTAIR 4 Multigas Detector 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.
• Do not block sensor openings as this may cause inaccurate readings.
Do not press on the face of the sensors, as this may damage them and
cause erroneous readings. Do not use compressed air to clean the
sensor holes, as the pressure may damage the sensors.
• Allow sufficient time for unit to display accurate reading. Response
times vary based on the type of sensor being utilized (see Section 5.4,
"Performance Specifications").
• 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.
, and an explosion hazard exists.
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ALTAIR 4 - Operating Manual
INSTRUMENT SAFETY
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