My old LabScanXE flashed 5 times per reading and my new ColorFlexEZ only flashes once. Was my LabScanXE doing the average of five readings or averaging the signal from the 5 flashes into a single reading?
In simple terms the LabScan XE is averaging the signal from the 5 lamp Bursts into a single reading and the ColorFlex is using the signal from a single Burst of light. These bursts are of different time durations and the durations are sampled multiple times during the Analog to Digital conversion stage of the measurement. The goal is to minimize the difference that would occur when measuring the same specimen multiple times. The ColorFlex uses Annular 45a/0 optical geometry and the LabScanXE uses Circumferential 0/45c optical geometry. These optical geometries have different efficiencies requiring levels of light, hence the different Bursts needed to achieve acceptable repeatability.
Please check the attached document for more information
If you have any questions contact HunterLab at firstname.lastname@example.org
Typical Citrus Numbers are as follows:
OJ1 - 46.0
OJ2 - 40.4
OJ3 - 38.7
OJ4 - 37.3
OJ5 - 36.3
OJ6 - 33.7
These standards are assigned values at HunterLab using a ratio hitch method. If the batch to batch color of the standard changes then the calibrated Citrus Number to will also change. Values are typically within +/- 0.3 of the values listed above for the OJ standards.
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Dear Mr. Kim,
Our first caveat is that our HunterLab directional instruments do not conform in every detail with TAPPI T 452 Brightness of pulp, paper, and paperboard (directional reflectance at 457 nm) .
However, as shown below, a CFEZ 45/0 LAV does agree closely on papers and paper fillers that are not UV optically brightened. If the sample is UV optically brightened, (glow blue under a UV lamp), the addition of a CMR2591 400-nm UV cut-off filter at the port will resolve this issue.
Color Flex EZ 45/0 LAV
457nm BR (45/0)
with standard open port
A LabScan XE with a UV Filter Option set to Custom 95%, or with a CMR2588 400-nm UV Cut-off filter for UV optically brightened materials would provide similar results.
Note that you can only use the CFEZ to measure paper samples that have no Fluorescent Brightener added.
A true Tappi meter would allow a user to measure with the Fluorescent Brightener component Included and Excluded. The CFEZ can only correlate to the Excluded measurement. It is the responsibility of the user to determine if the sample being measured has any Fluorescent Brightener added. If no brightener is added then the user can either measure with a standard open port, or with the CMR2591 port plate, the results would be the same. If there is brightener added then only measurements made with the CMR2591 plate will be valid. Gordon suggests that if the customer does not want to purchase CMR2591 then they can use a light booth with a UV source to determine if there is any brightener added to the paper.
Recently HunterLab developed the ColorFlex EZ Coffee meter. The color of coffee is important because it is predominantly used to assess the degree of roasting. The CFEZ Coffee is specially designed to measure the color of roasted coffee grounds, freeze-dried coffee, and instant powders.
Specialty scales have been added to the CFEZ to help easily determine the quality of the coffee being measured. These scales include the HunterLab Coffee Color Index (HCCI), SCAA (Specialty Coffee Association of America) Number, and SCAA Roast Classification. The CFEZ Coffee also now comes with a PQ (performance qualification) coffee tile. This tile allows the user to check the CFEZ Coffee instrument to ensure that it is reading color as expected.
The CFEZ Coffee has been designed to consistently measure lot to lot differences to improve upon consistency and batch to batch production quality. By using the CFEZ Coffee it will be easy for to define the degree of roasting. The CFEZ Coffee gives users a quick and easy way to quantitatively determine the quality of their coffee.
You can find more information for the CFEZ Coffee at the product page on our website
- Port Inserts
- Sample Clamp and Port Forward Stand (D2-1010-459)
- Orange Juice Tube Holder (D02-1011-127)
- Glass Port Insert
- UV Port Insert (02-6624-05)
- Labscan XE flashes versus ColorFlexEZ