ColorFlex EZ Citrus


ColorFlex EZ Citrus Spectrophotometer

The easy-to-use ColorFlex EZ Citrus is specifically designed to accurately measure the Citrus Number, Citrus Redness and Citrus Yellowness. This accuracy is achieved by using 45º/0º optical geometry, the only measurement technology proven to measure color the way the human eye sees it.

Easy-to-use. Compact. And Increased Performance. ColorFlex EZ Citrus Spectrophotometer gives you unsurpassed confidence and trust in your outcomes.

The ColorFlex EZ Citrus measures Citrus Number, Citrus Redness and Citrus Yellowness. These indices were primarily intended to score orange juice concentrate, but in practice have also been used for grapefruit and lemon juices. In addition to the citrus values, the instrument can also measure in terms of the Hunter Lab scale as well as other widely used color scales. Thus the system can also be used to measure the reflected color of virtually any opaque or semi-opaque liquid.

The system comes complete with a sample tube holder, stand, clamp and a calibrated plastic O.J. standard. The instrument has a large, easy-to-read display and a sealed keypad. It requires very little bench space, and is very easy to use. In practice, the juice sample is poured into a test tube or capped tube. The tube is inserted into the instrument tube holder. By pressing one button on the instrument the measurement is made. CN (Citrus Number), CR (Citrus Redness) and CY (Citrus Yellowness) will simultaneously be displayed. The ColorFlex EZ Citrus can be connected to a printer if hard copy data is desired.

Product Specifications


Measurement Principle: Port up or Port forward dual-beam spectrophotometer

Geometry: Directional annular 45° illumination / 0° viewing

Spectrophotometer: Sealed optics; 256-element diode array and a high resolution concave holographic grating

Port Diameter/View Diameter: 31.8 mm (1.25 in) illuminated/ 25.4 mm (1 in) measured

Specular Component: Excluded

Spectral Range: 400 nm – 700 nm

Spectral Resolution: < 3 nm

Effective Bandwidth: 10 nm equivalent triangular

Reporting Interval: 10 nm

Photometric Range: 0 to 150 %

Light Source: Pulsed Xenon Lamp

Flashes per Measurement: 1 flash

Lamp Life: > 1 million flashes

Measurement Time: < 1 second from button push to measurement 2 seconds from button push to data display

Minimum Interval Between Measurements: 3 seconds

Standards Conformance: CIE 15:2004, ISO 7724/1, ASTM E1164, DIN 5033, Teil 7 and JIS Z 8722 Condition C

Standards Traceability: Instrument standard assignment in accordance with National Institute of Standards and Technology (NIST) following practices described in CIE Publication 44 and ASTM E259


Inter-Instrument Agreement:

  • ∆E*< 0.15 CIE L*a*b* (Avg) on BCRA II Tile Set
  • ∆E*< 0.25 CIE L*a*b* (Max) on BCRA II Tile Set

Colorimetric Repeatability: ∆E*< 0.05 CIE L*a*b* on white tile (20 Readings)


Data Views: Color Data, Color Difference Data, Tristimulus Color Plot, Spectral Data, Spectral Difference Data, Spectral Plot, Spectral Difference Plot

USB Flash Drive Features: Backup of Setups and Data, Setup Transfer to Multiple Units, Data Export to Excel

Other Features: Pass/Fail, Average Multiple Readings, Search for Closest Standard

Illuminants: A, C, D50, D55, D65, D75, F2, F7, F11

Observers: 2° and 10°

Color Scales: CIE L*a*b*, Hunter Lab, CIE L*C*h, CIE Yxy, CIE XYZ

Color Difference Scales: ∆L*a*b*, ∆Lab, ∆L*C*H, ∆L*C*h, ∆Yxy, ∆XYZ

Color Difference Indices: ∆E*, ∆E, ∆C*, ∆C and ∆Ecmc

Indices and Metrics: E313 Whiteness and Tint (C/2° or D65/10°), E313 Yellowness (C/2° or D65/10°), D1925 Yellowness (C/2°), Y Brightness, Z%, 457 nm Brightness, Opacity, Color Strength (Average and Single Wavelength), Gray Change, Gray Stain, Metamerism Index, Shade Number

Citrus Color Model Only: Citrus Number, Citrus Redness, Citrus Yellowness Data Storage:

  • As Standard – 250 spectral or tristimulus with Pass/Fail tolerances as Working, Physical, Numeric and Hitch
  • As Sample – 2000 spectral

Languages: Chinese, English, French, German, Italian, Japanese, Spanish


  • Dimensions:

    • Height: 16 cm (6.3 in.)
    • Width: 13 cm (5.1 in.)
    • Depth: 36 cm (14.2 in.)
    • Weight: 4.5 kg (9.9 lbs)

    Display: 7.1 cm x 5.4 cm (2.8 in. x 2.1 in.) backlit color LCD

    Interface: 3 USB 2.0 ports

    Power: 100 to 240 VAC 47 to 63 Hz

    Operating Environment: 10° to 40°C (50° to 104° F), 10 % to 90 % RH, noncondensing

    Storage Environment: -20° to 65°C (-5° to 150° F), 10 % to 90 % RH, noncondensing

    Standard Accessories:

    • Calibrated instrument white tile
    • Certificate of traceability
    • Black glass
    • Green diagnostic tile
    • Universal AC adaptor
    • Computer interface cable
    • USB flash drive
    • ColorFlex EZ User guide

Measures the reflected color of solids and liquids

Product-standard storage with Pass/Fail tolerances

Displays Color Data, Color Plot, Spectral Data and Spectral Plots

45°/0° measurement geometry

Requires very little bench space

Can be connected to a printer or a PC

Compatible with PC based EasyMatch QC quality control software




Footswitch Assembly


The footswitch is used to initiate sample measurement without the use of hands.

Hard-Sided Carrying Case


Sample Cup Opaque Cover

Provides a light trap to exclude the interference of external light on the sample cup.

Ring and Disk Set


For use in the glass sample cup for sample presentation of liquids, powders, granules and pellets.

Glass Sample Cup


2.5 inch (64mm)

Optically clear glass cup for sample presentation of liquids, powders, granules and pellets.

Port Insert for Sample Cup


64 mm (2.5 in) Designed to hold and position the glass sample cup perfectly to accurately measure powders, granules, pellets, paste and liquids.


32 mm (1.25 in) Port Insert


25 mm (1 in) Port Insert


19 mm (0.75 in) Port Insert


13 mm (0.50 in) Port Insert

USB Printer


USB printer allows hard copy measurements to be printed. Requires a standard USB cable, sold separately. Uses Thermal Printer paper, sold separately.

L02-1014-440 Thermal Printer Paper (5 rolls per package)

Thermal printer paper for use with A13-1014-259 USB Printer.

USB Barcode Reader


Barcode Scanner scans product IDs directly into ColorFlex EZ. Automatically detected at USB port.

USB Flexible Keyboard


88 character keyboard allows user to enter IDs directly into ColorFlex EZ.


Booking Demo