Gas Exposure Of 100 % Lel - MSA ALTAIR 5X Manuel D'utilisation

Gas Exposure of 100 % LEL

When gas reading exceeds 100 % of the lower explosive limit (LEL), the device enters a Lock Alarm
state and displays "XXX" in place of the actual reading.
A catalytic combustible gas reading of "XXX" indicates the atmosphere could be above 100 % LEL
or 5.00 % Vol CH4 and an explosion hazard exists. Move away from contaminated area immediately.
For ALTAIR 5X IR devices with an enabled 100 % Vol methane IR sensor, the LockAlarm will clear,
and the catalytic combustible again displays combustible concentrations when the gas sample drops
to a lower level. For devices without an enabled 100 % Vol methane IR sensor, the user can clear the
LockAlarm state only by turning the device OFF, and then ON again in a fresh air environment. When
catalytic combustible gas reading digits appear, the device is available for measuring gases once
again.
LockAlarm of the catalytic combustible sensor occurs during Bump Testing and calibra-
tion of a % Vol combustible IR sensor.
After the IR sensor Bump Test, the LockAlarm must be cleared (as described above)
before the catalytic combustible sensor is again able to measure and provide readings.
Check your national standard values for 100 % LEL.
WARNING
ALTAIR 5X/ALTAIR 5X IR
Description
US
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