HunterLab’s Vista transmission spectrophotometer offers a faster and more modern method for color measurement using the LOVIBOND® RYBN 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® RYBN 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 color scales are derived from the standard methods (AOCS Cc 13e-92/BS 684-1.14, and AOCS Cc 13b-45) 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. LOVIBOND® RYBN is implemented in Essentials version release 21 and higher. LOVIBOND® RYBN is implemented in Essentials Rev79 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 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 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® RY 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 > COLOR SCALES.
- Click CUSTOM INDICES button, then click LOVIBOND in custom indices dialog. 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. If you want to report LOVIBOND® RY, check "RY" radios button; If you want to report LOVIBOND® RYBN, check "RYBN" radios button. Click SAVE to go back to Indices tab.
- From the Indices tab, select the LOVIBOND® Lov-Y[C/2] and Lov-R[C/2](If you want to use LOVIBOND® RYBN, please select all 4 RYBN indices.).
Please note: in current essentials, even we show LOVIBOND® RYBN as 4 separate indices, we only report two types, LOVIBOND® RY together or LOVIBOND® RYBN together. e.g. if you configure to do LOVIBOND® RYBN in step 2, even you only select one index LOVIBOND® R in Indices tab, it will automatically report 4 LOVIBOND® RYBN indices together.
4. To save the above setup for future use, click WORKSPACE > SAVE WORKSPACE. 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.