USTER®
HVI 900
Instruction Manual
Uster Technologies, Inc.
Chapter 14
Version 4.0 (1.99) Appendix - Page 14-14
Remain the Same
For yarn spinners, once the Categories are defined, the Category
Definition should not be changed unless the bales remaining in the
physical warehouse can be changed accordingly.
A change in Category Definition will cause the Histograms review to be
incorrect. Because the consequences of making changes in Category
Definition are so great, careful consideration should be given to the
Categories as they are defined.
10.4.2 How to Determine the Average and
Range of a Spinning Mill’s Inventory
If you do not have an estimate of the average value and the range for
each of the properties, we suggest that the following method be used to
determine this information.
• Take a sample from the middle of each of the bales that are in the
opening room. Continue to do this for a 30-day period. At that
point, if you had 40 bales in the opening room each day, would
have 1200 samples.
• Use a separate identifier for each day, measure the samples on the
HVI, and send the test results to the 940 DataManager.
• By looking at the data for each property, you can assume that the
average and the range for all of the cotton in your warehouse is the
same as that of the 1200 samples that were tested. If you continue
to purchase cotton by the same purchasing standards, the cotton that
you purchase should fall within the same average and range as the
cotton currently in your warehouse.
• Now, you can define the categories based on the average and
range of fiber property values for the bales in your warehouse.
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