e. Connect one end of the tubing to the calibration cap.
f. Connect the other end of the tubing to the gas
regulator.
4. Select Start to begin the bump test.
5. Open the pressure reducer valve on the calibration gas cylinder.
6. The device will display the bump test results.
7. Close the valve after bump testing.
8. Remove the calibration cap.
3.4.2 Calibration
There are two methods to perform a calibration on the ALTAIR io 4
• Automatically through the ALTAIR io DOCK
• Manually using proper calibration gas, regulator, tubing, and a calibration cap
Manual calibration must be performed using a flow regulator with a flow set to 0.25 liters per minute.
MSA recommends calibration at least every six months; however, many countries and/or organizations have their own
calibration guidelines. The ALTAIR io 4 calibration interval can be configured to adapt to these requirements.
During zero calibration, the O
2
sensor is also span calibrated to 20.8% O
2
fresh air, adjusting the calibration curve as
needed. During span calibration, the O
2
sensor's accuracy is checked against a known oxygen gas concentration without
adjusting the calibration curve.
The calibration procedure adjusts the span value for any sensor that passes the calibration test; sensor span values that fail
calibration are left unchanged. Since residual gas may be present, the device may briefly go into an exposure alarm after
the calibration sequence is completed.
If a sensor is nearing its end of life, the device will communicate a notification to the user after a successful calibration.
ALTAIR io 4 20
3 Getting Started US
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