Finishing Calibration - MSA ALTAIR 4X Operating Manual

If the span calibration is unsuccessful:
• a Sensor Life Indicator displays (
sensor has reached its end of life and should be replaced
• The unit remains in alarm state until the ▲ button is pressed
• The and
successful calibration or the sensor in question is replaced.
NOTE: A span calibration can fail for many reasons other than a
sensor at the end of its life. If a span calibration failure
occurs, verify items such as remaining gas in the
calibration cylinder, gas expiration date, security of the
calibration cap, etc. and repeat calibration prior to
replacing the sensor.

3.9.3 Finishing Calibration

1. Close the valve on the regulator.
2. Remove the calibration cap.
The calibration procedure adjusts the span value for any sensor
that passes the calibration test; sensors that fail calibration are left
unchanged. Since residual gas may be present, the instrument
may briefly go into an exposure alarm after the calibration sequence
is completed.
and
symbols remain on the display until a
) to show the
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