Accessing The Expanded Tolerance Calibration - MSA Orion Operation Manual

Chapter 5, Calibration

Accessing the Expanded Tolerance Calibration

Check that:
• all appropriate sensors are installed and in their correct location
• the calibration setup is correct and verify that:
• all connections are secure
• the proper gas regulator and cylinder are being used.
If the setup is correct, it may be necessary to calibrate the
instrument using the Expanded Tolerance Calibration window.
From the Autocalibration Failure page:
1. Do NOT push the CHANGE/RESET button.
• The CAL flag continues to display.
2. Do NOT remove the calibration gas; it must continue to flow
from the initial calibration attempt.
3. Press and hold the ON-OFF/PAGE button for approximately
three seconds.
• The hourglass displays until the CHANGE flag appears on
the display.
4. Release the ON-OFF/PAGE button.
• The instrument takes approximately 10 seconds to
calibrate using the Expanded Tolerance Calibration
window.
• If the calibration is successful, the instrument returns to
the Measure page.
• If the calibration is not successful, the Autocalibration
Failure page displays again. The above procedure can be
repeated indefinitely but is not likely to yield a successful
calibration. Before proceeding, check the following:
• Cylinder type -
Ensure that the values on the cylinder match the
Autocalibration values programmed into the Orion.
• Cylinder pressure -
Ensure that the cylinder is not empty.
• Pressure regulator -
Ensure that the pressure regulator has a flow of
0.25 LPM. (See TABLE 8-1 for the correct MSA
part-numbered regulators.)
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Operating Manual