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.

WARNING! 

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.

Failure to follow this warning can result in serious personal injury or death.

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.

NOTE: LockAlarm of the catalytic combustible sensor occurs during Bump Testing and calibration 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.

NOTE: Check your national standard values for 100 % LEL.