Calibrating An Oxygen Instrument - MSA ALTAIR Pro 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 Pro 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.
To enter the calibration mode, make sure you are in fresh,
uncontaminated air.
1. In normal operating mode, hold the TEST button for two seconds.
• 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.
3. Press the TEST button at the "FAS" "?" screen to perform a
calibration at 20.8% O 2 .
NOTE: This procedure must be performed in fresh,
uncontaminated air. Do not breathe on the sensor while
performing this function.
• If the successfully calibrates:
• "OK" displays
• If the sensor does not successfully calibrate:
• "ERR" displays.
4. Wait five seconds.
• The instrument returns to normal operating mode.
5. If "ERR" displays after calibration, the current settings did not
change. Immediately check that:
• The instrument is in fresh, uncontaminated air during the
calibration process
• No one breathes on the sensor during calibration.
• Repeat steps 1 through 6, as necessary.
6. The display must read "OK"; if "ERR" remains, remove the
instrument from service.
7. Perform a bump test to confirm operation and activate the "√".
4-5