Calibrating An Oxygen Instrument - MSA Altair Manual De Operación

Calibrating an Oxygen Instrument

• False oxygen alarms can occur due to changes in barometric
pressure (altitude changes) or extreme changes in ambient
temperature.
• The Altair Detector is equipped with a feature to allow calibration at
pressure and/or temperature of use.
• Be sure that the instrument is in known fresh air before performing
a calibration.
• The Altair Oxygen instrument has the ability to display the current
Oxygen level with a press of the TEST button. See Chapter 2,
"Using the Altair Single Gas Detector" for more details. If this
reading is other than 20.8%, a calibration is required in air that is
known to be safe.
To enter the calibration mode, make sure you are in fresh,
uncontaminated air.
1. In normal operating mode, press the TEST button.
• The current Oxygen reading displays.
• See FIGURE 4-2 for more details.
2. When the "TEST" "GAS" "?" displays, press and hold the TEST
button to enter calibration.
• "TEST" "CAL" displays
• After three seconds, "FAS" "?" displays asking the user if a
fresh air setup/calibration is desired.
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