HunterLab’s Vista transmission spectrophotometer offers a faster and more modern method for color measurement using the LOVIBOND® RY and AOCS color indices. Rather than requiring the use of expensive and hard to clean 1” or 5.25” transmission cells, Vista enables measurements of LOVIBOND® RY indices in standard transmission cells and vials such as 10mm, 20mm 24mm, 33mm or 50mm, and accurately reports the results in either 1” or 5.25” cell pathlengths.
HunterLab’s implementation of LOVIBOND®/AOCS RY color scales are derived from the standard methods (AOCS Cc 13e/BS 684-1.14, and AOCS Cc 13b) and based on the original work done by National Institute of Standards Technology. The results are precise reporting of LOVIBOND® Color in a modern spectrophotometer that provides fast and reliable color information. (Note that HunterLab LOVIBOND® RY is based on LOVIBOND® RYBN however HunterLab has not included the infrequently used BN part of this scale.) LOVIBOND® is implemented in Essentials version release 21 and higher.
HunterLab has extended the Vista transmission spectrophotometer’s value by providing flexible measurement and reporting parameters. The Red and Yellow values are reported together in one measurement with both cell pathlength measured, and cell pathlength reported. To report 1” or 5.25” LOVIBOND®/AOCS RY values, the user can measure their samples using a variety of standard cell path lengths. The precision provided by Vista even permits the use of a 10mm cell to measure the difficult light color samples and accurately report LOVIBOND®/ AOCS RY values at 5.25” pathlength. Taking less than 5 seconds per measurement, the result is improved productivity with less material.
Configuring Vista to measure and report Lovibond® color values
The following is an example using 20 mm flat sample cell and reporting LOVIBOND®RY at 133.35 mm (5.25'').
- From the Workspace menu, select color scales.
- From the Indices tab, select the LOVIBOND® Lov-Y[C/2] and Lov-R[C/2](If you want to use AOCS RY, please select AOCS-R[C/2] and AOCS-Y[C/2]).
- Click "Custom Indices" button and click the "Lovibond" button in Custom Indices dialog. (Click "AOCS" button if AOCS RY is applied). Enter the Cell Path Length (mm) that will be used (The cell pathlength number must be from 0 to 100 with maximum one decimal).
- Select the Report Path Length for the output desired. As a suggestion, use "1 inch" for very dark samples and "5.25 inch" for light samples.
- To save the above setup for future use, click "Save Workspace" from Workspace menu
When prompted to Save, select NO to create a new Workspace Name
Enter the name of the Workspace. Such as, "Lovibond" & cell pathlength
Standardize using the sample cell filled with Distilled Water
Note: Standardization is required when changing cell path lengths or if the standardization interval has expired.
Empty cell, dry, and fill with desired sample to measure
Read sample and enter the desired sample name. You may wish to include the cell path length that was used as part of the name. Such as, name sample with cell pathlength, like "20mm sample1". Since you can always change the cell/report pathlength value through LOVIBOND® configuration, it is necessary to know what true cell pathlength was used to measure this sample.
For a simplified presentation of measurement data, Vista also offers the EZ View screen to show LOVIBOND® RY data.
Note: If you want to use a different pathlength cell to measure samples. Please open a new job, and repeat the above steps. If you do not open a new job, directly apply the new LOVIBOND® cell pathlength, all the existing samples LOVIBOND® RY will be recalculated to this new configuration.
“LOVIBOND” is a registered trademark of The Tintometer Ltd, UK.