HunterLab ColorFlex EZ Citrus, User Manual

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ColorFlex EZ Citrus Citrus User’s Manual Version 2.0
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Figure 5. Time Since Last Standardization
It is recommended that the ColorFlex EZ Citrus be standardized every four to eight hours. The
instrument will automatically prompt for standardization after the Standardization Interval set
in Global Options has elapsed, so it is a good idea to enter 4 to 8 hours as the Standardization
Interval.
Also standardize the ColorFlex EZ Citrus any time there is a significant change (greater than 5°F)
in ambient temperature. For example, if the ColorFlex EZ Citrus is moved an air-conditioned
office to an outdoor site that is 90°F, standardization should be repeated once the instrument
has had a chance to stabilize under the new temperature. Also standardize the instrument any
time there is a change in the optical path, such as changing from using the standard port to the
sample cup port.
Figure 6. Set Standardization Interval
It is important that the standards used in standardization be treated carefully. Tiles must be
kept clean and in good condition. If there is any doubt about the standards being clean, clean
them as described in the
MAINTAINING AND TESTING COLORFLEX EZ CITRUS chapter.
Standardization Process
Standardization of a ColorFlex EZ Citrus is performed as follows:
1.
To standardize, the test tube holder is removed from the front of the instrument and
replaced by the standard 31.8 mm (1.25 in) diameter open port.
2.
Remove the calibration tiles from the standards box. Check that the tiles are clean
and free of dust and scratches. If they are dirty (including marked with fingerprints),
clean them as described in
MAINTAINING AND TESTING COLORFLEX EZ CITRUS .