Calibration; Fresh Air Setup And Zero Calibration - MSA ALTAIR 4X Manual De Funcionamiento

3.9 Calibration

The ALTAIR 4X can be calibrated manually using this procedure or
automatically using the Galaxy Test Stand. Refer to 7.7 of the Appendix.
Calibration must be performed using a flow regulator with a flow rate set
to 0.25 liters per minute.
If a battery charging cycle is interrupted before it is completed (4 hours
for a fully discharged battery), allow the instrument's internal
temperature to stabilize for 30 minutes before performing a Calibration.
NOTE: The Galaxy Test Stand is not a CSA certified calibration method.

3.9.1 Fresh Air Setup and Zero Calibration

To skip the ZERO procedure and move directly to the calibration span
procedure, push the ▲ button. If no button is pushed for 30 seconds,
the instrument prompts user to perform a SPAN calibration before
returning to the Normal Operation mode.
1. Press and hold the ▲ button in Normal Operation mode for three
seconds.
2. If calibration lockout option is selected, enter password.
• ZERO screen displays.
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