Purpose: Sometimes product is in short supply or is very expensive. In these cases, using the smallest amount of sample possible for color measurement is preferable. This Applications Note describes Hunter Lab's color measurement options designed for measuring very small samples or quantities of sample. More information on these options can be obtained from Hunter Lab's Sales Department.
Options for Solids
UltraScan VIS: A02-1011-184 modified port plate with 4-mm round opening that allows reflectance measurements of samples only slightly larger than that opening or small areas of larger samples. The retro-viewer option may be used to ensure that the desired sample area completely covers the opening in the port plate.
Note: Small area view (SAV) option required. Performance specifications will not be met with this smaller-than-standard port plate. The change of geometry with this option will cause a slight shift in the color values of the calibration standards.
UltraScan PRO: A02-1011-184 modified port plate with 4-mm round opening that allows reflectance measurements of samples only slightly larger than that opening or small areas of larger samples. The retro-viewer option may be used to ensure that the desired sample area completely covers the opening in the port plate.
Note: Performance specifications will not be met with this smaller-than-standard port plate. The change of geometry with this option will cause a slight shift in the color values of the calibration standards.
Options for Powders
UltraScan VIS: D02-1012-313 holder and special port plate that allow reflectance measurements of approximately 0.4 cc of packed powder. Powder is scooped into the powder holder and packed down with a plunger. The powder holder is then placed in a specially-designed port plate and the powder measured through the holder's clear window.
Note: Small area view (SAV) option required. The powder holder should be used ONLY for color difference measurements.
Agera: CMR 2439 holder and special port plate that allow reflectance measurements of approximately 0.4 cc of packed powder. Powder is scooped into the powder holder and packed down with a plunger. The powder holder is then placed in a specially designed port plate and the powder measured through the holder's clear window.
Note: Variable sample illumination (VSI) option required. The powder holder should be used ONLY for color difference measurements.
Options for Transparent Liquids
Vista, UltraScan PRO, and UltraScan VIS: L02-1012-202 semi-micro cell holder and optical assembly, which allows transmittance measurements of transparent liquids in a 10-mm (0.4 mL) or 20-mm (0.8 mL) path length semi-micro cell (cuvette).The semi-micro cell holder with beam-reducing optics is installed in the transmittance compartment and then the cell filled with sample is inserted for measurement.
Note: The same cell used to hold the blank during standardization should be used for sample measurements, particularly when disposable cells are used.
See attached pdf file for the complete article with illustrations.
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