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.
Question: Can i use CIELAB and D65/1- or F2 to report a/b ratio?
Answer: The Illuminant/Observer combination can have a significant affect on the results. Historically and currently all three types of Tomato tiles, USDA UCDavis, BCR400, HunterLab Tomato are all assigned in HunterLab L,a,b, for C/2. If you use CIELAB L,a,b* or any other illuminant/observer combination such as D65/10 or F2, F7, F11 then the numbers can vary greatly. I would hope that they are not just trying different illuminant/observer combinations until they get numbers that they like.
We have one customer who orders the new HunterLab Tomato tile and requests that we use CIELAB C/2 on the label, which is not the normal convention, and may cause confusion if compared to the Hunter Lab C/2 a/b ratio.
The ColorFlexEZ can only report spectral reflectance from 400nm to 700nm in 10nm increments. There is no method to increase the reporting range of a ColorFlexEZ. An unmodified ColorFlexEZ provides a nominal amount of UV energy to the sample when it is illuminated during the read sequence. If any of the UV energy is re-emitted in the range of 400nm to 700nm then the ColorFlexEZ will report that energy. The amount of UV energy supplied varies from instrument to instrument and there is no method to control this amount. A user can employ a port that has a filter glass permanently attached that can prevent UV energy from illuminating the sample during the read sequence.
FAQ: “My ColorFlex used to print fine whenever I took a reading. Now it keeps printing the same values even when I make new measurements that show on the screen. Can you tell me what is wrong?”
Look at the top left corner of your measurement screen. There is a number there that is the number of records saved in your Datalog. If the number is “2000” and displaying in red, this means you have filled the Datalog to capacity.
Whenever you press “Print”, the data record is sent out to all ports – out the USB port at the back of your CFEZ to a data collector on a PC; to a hard copy printer and to the Datalog.
To clear the Datalog, just go to Main Menu/Saved Readings/Delete All Readings. The counter will drop to 0 on the measurement screen.
FAQ: "Just a simple question, the ColorFlex EZ is compatible with a Windows 7 OS computer, right? Thank you."
The issue of CFEZ compatibility with the Windows operating system on a PC does not really come into it. The CFEZ is a device that is self-contained with its own operating system and instruction set. The sensor can measure and report data; it does not need a computer.
The same applies to the older legacy ColorFlex sensors as well as MiniScan EZ, XE Plus and XE.
If you use a program like EasyMatch QC to communicate with these portable sensors; then this program has to be WIN 7 compatible as they are running on the WIN 7 host communicating with the CFEZ device.
EasyMatch QC is WIN 7 compatible from version 4.30 (Help/About) forward.
If you have dropped or spilled any product into the CFEZ the easiest way to clean the instrument is to use some compressed air (for cleaning keyboards and other computer parts) and clean any dust or debris that way. If you need further cleaning I would start with a dry cloth (such as a Kim wipe) and make sure not to apply too much pressure when cleaning the lens cover that would cause the glass to break. If you really needed to you could use a solvent as the piece is glass.
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
- Labscan XE flashes versus ColorFlexEZ
- Tomato Tiles which ILL/Obs to use
- Can CFEZ upgrade lamp to measure UV range?
- Why does my ColorFlex EZ keeps printing the same value?
- ColorFlex EZ, MiniScan EZ and WIN 7 compatibility
- How to clean ColorFlex EZ instrument lens cover.