70Xi Cold Flow Properties Laboratory Analyzer User Guide
14
f. Select the QC sample in the list box that you wish to enter or modify the control limits.
g. Select the Temperature Unit (°C or °F) at the top of the window.
h. Enter the Upper Limit, Lower Limit and/or Centerline values for the corresponding run
modes.
i. QC upper and lower control limits (UCL, LCL) can also be automatically calculated by the
analyzer following ASTM D6299 methodology if there are a minimum of 20 valid data
points. The analyzer also allows the user to manually identify and exclude outliers before
calculating the control limits.
j. Press the HOME button
to save the control limits and return to the Home screen.
k. Whenever the test result of a QC sample exceeds the control limits, a pop-up window
will appear with the message “The last QC test exceeded the control limit
requirements!.” This pop-up window will appear each subsequent time the analyzer
starts a non-QC test under the same run mode that has failed the previous QC test, until
one of the following rectifying conditions are met:
1) Re-run another QC test that meets the control limits
2) Have an Administrator acknowledge the error message by pressing OK on the
pop-up window
l. Failed QC tests are flagged in the Results History screen with a
icon. QC tests
performed without any control limits are flagged in the Results History screen with a
icon.
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