Monitoring Combustible Gases - MSA ALTAIR 4X Manual De Funcionamiento

• a vibrating alarm triggers
• instrument displays and flashes the Alarm icon
Minimum icon
(Deficient alarm) along with the corresponding oxygen
concentration.
The LOW alarm (oxygen deficient) is latching and will not automatically
reset when the O 2 concentration rises above the LOW setpoint. To
reset the alarm, press the ▲ button. If the alarm condition still exists,
the ▲ button only silences the alarm for five seconds.
False oxygen alarms can occur due to changes in barometric pressure
(altitude) 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.

2.9 Monitoring Combustible Gases

The instrument displays the combustible gas concentration in %LEL or
%CH 4 on the Measuring page until another page is selected or the
instrument is turned OFF.
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.
If the gas concentration reaches or exceeds the alarm setpoint, the
instrument:
• backlight turns ON
• a vibrating alarm triggers
• displays and flashes the alarm icon
icon (LOW alarm) or the maximum icon
• enters an alarm state.
(Enriched alarm) or the Maximum icon
" WARNING
and either the minimum
and either the
(HIGH alarm)
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