Specifications

GB
MSA OPERATION
ALTAIR PRO - Operating Manual 23
3.4. Oxygen Measurements
The ALTAIR PRO Detector can be purchased to measure the concentration of
oxygen in an atmosphere. The value displayed is percent by volume of oxygen in
the atmosphere.
High and low alarm setpoints can be configured to alarm in any combination of
oxygen:
 enrichment (greater than 20.8%) or
 depletion (less than 20.8%).
When an alarm setpoint is reached the alarm sequence is initiated.
Low alarm indicates:
 the lower %O
2
level of the two alarm settings
 a more urgent condition and the faster alarm sequence will be indicated
 "LO" "ALARM" displays.
The LOW alarm (lower of the two O
2
alarm settings) is latching and will
not reset when O
2
concentration rises above the LOW setpoint.
To reset alarm push the button.
False oxygen alarms can occur due to barometric pressure (altitude)
changes 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.