MSA Orion G Mode D'emploi page 10

Operating Manual
• 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 "100", or a %CH
range of approximately 5% to 10% indicates that an explosion
hazard exists. Extreme caution must be exercised in this
situation.
• Do not use the Orion G Multigas and Leak 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
or dusts.
• Do not use the Orion G Multigas and Leak Detector to test for
combustible gases in atmospheres containing vapors from
liquids with a high flash point (above 100
in erroneously low readings.
• Allow sufficient time for unit to display accurate reading.
Response times vary based on the type of sensor being utilized
(see "Performance Specifications" section of manual).
Additionally, allow a minimum of 0.7 seconds per foot of sample
line to allow the sample to be drawn through to the sensors.
• Keep the probe tip above liquid surfaces; otherwise, liquid may
enter the system and block the sample flow, causing inaccurate
readings and/or internal damage.
• 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.
• Replace alkaline cells or recharge NiMH battery-pack in
non-hazardous area only. Use only battery chargers listed in
this manual; other chargers may damage the battery pack and
the unit. Dispose of batteries in accordance with local health
and safety regulations.
• Do not alter this instrument or make any repairs beyond those
specified in this manual. Only MSA-authorized personnel may
repair this unit; otherwise, damage may result.
Chapter 1, Safety Limitations and Certifications
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