Monitoring Combustible Gases - MSA ALTAIR 5 Manuel D'utilisation

When the alarm setpoint is reached for either of the above conditions:
• the alarm message displays and flashes in combination with the
oxygen gas concentration
• backlight turns ON
• alarm sounds (if active)
• alarm LEDs flash (if active)
• vibrating alarm triggers (if active).
The LOW alarm (oxygen deficient) is latching and will not reset even
when the O 2 concentration rises above the LOW setpoint. To reset the
alarm, press the ▲ button. If the alarm is latching, the ▲ button
silences the alarm for five seconds. Alarms can be made latching or
unlatching via MSA Link
False oxygen alarms can occur due to changes in barometric pressure
(altitude), humidity, or extreme changes in ambient temperature.
It is recommended that an oxygen calibration be performed at the
temperature and pressure of use. Be sure that the instrument is in
known fresh air before performing a calibration.

2.8. Monitoring Combustible Gases

The instrument can be equipped with a catalytic combustible sensor
that detects a variety of combustible gases up to 100% LEL and
displays the reading as either %LEL or %VOL. The Altair 5IR can
contain both a catalytic combustible sensor and an IR combustible
sensor, if equipped. The IR sensor can display the reading in either
%LEL or %VOL, depending on the sensor chosen.
If an alarm activates while using the instrument, leave the
area immediately.
Remaining in the area under such circumstances can cause
serious personal injury or death.
The instrument has two alarm setpoints:
• HIGH Alarm
• LOW Alarm
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! WARNING