HunterLab ColorFlex EZ 45°/0° Reflectance Spectrophotometer
| Brand | HunterLab |
|---|---|
| Origin | USA |
| Model | ColorFlex EZ |
| Product Type | Benchtop Spectrophotometric Colorimeter |
| Optical Geometry | 45°/0° |
| Light Source | Pulsed Xenon Lamp |
| Spectral Range | 400–700 nm |
| Repeatability | ΔE* ≤ 0.05 (CIE L*a*b*, avg. of 20 measurements on certified white tile) |
Overview
The HunterLab ColorFlex EZ is a benchtop spectrophotometric colorimeter engineered for high-precision, repeatable reflectance color measurement across diverse sample forms—including powders, granules, liquids, pastes, films, and solid slabs. Its optical architecture implements the CIE-recommended 45°/0° geometry, where illumination is delivered via a ring of 45°-angled xenon flashes onto the sample surface, while detection occurs perpendicularly at 0°, excluding specular reflection to ensure consistent assessment of diffuse reflectance. This configuration complies with ISO 7724-1, ASTM E1164, and CIE 15:2004, making it suitable for quality control in regulated industries such as food, pharmaceuticals, plastics, paints, and textiles. The instrument employs a sealed 256-element diode array spectrometer coupled with a high-resolution concave holographic grating, delivering spectral data at <3 nm resolution and 10 nm effective bandwidth—enabling accurate derivation of all major color spaces and indices without interpolation artifacts.
Key Features
- Benchtop design with upward-facing aperture enables intuitive, ergonomic measurement of containers, Petri dishes, cuvettes, and irregular samples without repositioning.
- Pulsed xenon light source provides stable, daylight-simulating illumination with >1 million measurement cycles lifetime and <3-second total cycle time (including stabilization and acquisition).
- 7.1 cm × 5.4 cm backlit LCD display supports eight languages (English, Chinese, French, German, Italian, Japanese, Spanish, and Portuguese) for global laboratory deployment.
- Integrated pass/fail evaluation engine allows real-time conformance assessment against user-defined tolerances in ΔL*a*b*, ΔE*, ΔECMC, or custom index thresholds.
- Onboard storage accommodates up to 250 reference standards or 2000 sample readings; data export via three USB 2.0 ports supports CSV, XML, and proprietary .cfx formats.
- Robust mechanical construction (4.5 kg mass, 13 × 36 × 16 cm footprint) ensures stability during repeated use in production or QC environments.
Sample Compatibility & Compliance
The ColorFlex EZ accommodates samples ranging from translucent solutions (measured in standard 10 mm pathlength cuvettes) to opaque particulates (via optional powder cups or rotating sample holders). Its 31.8 mm illumination area and 25.4 mm measurement aperture support both large-area averaging and localized assessment. Instrument calibration is traceable to NIST via included certified white, black, and green tiles—each individually certified per ASTM E259 and CIE Publication 44. Regulatory compliance includes full adherence to ISO 9001-aligned measurement protocols, GLP audit trails when paired with EasyMatch QC software, and compatibility with FDA 21 CFR Part 11 requirements through electronic signature and secure data logging features.
Software & Data Management
The system operates standalone or integrates seamlessly with HunterLab’s EasyMatch QC software for Windows®. This platform delivers advanced statistical process control (SPC), multi-instrument fleet management, and automated report generation compliant with ISO/IEC 17025 documentation standards. Users can define up to 99 unique measurement configurations—including custom illuminants (A, C, D50–D75, F02–F11), observer angles (2° or 10°), and specialized indices (e.g., E313 whiteness/yellowness, D1925 yellowness, 457 nm blue-light whiteness, opacity, gray stain, metamerism index). Spectral data export supports third-party analysis in MATLAB®, Python (NumPy/Pandas), or JMP® for method development and multivariate modeling.
Applications
The ColorFlex EZ serves as a primary color verification tool in manufacturing QC labs where reproducibility and inter-instrument agreement are critical. It is routinely deployed for: pigment dispersion uniformity in coatings; batch-to-batch consistency in powdered pharmaceutical excipients; ripeness grading of citrus and tomato products using Citrus Number or TPS indices; whiteness evaluation of paper and detergents; yellowness index monitoring in polyolefin resins; and opacity assessment of cosmetic foundations. Its ability to derive both CIE L*a*b* and Hunter Lab coordinates—alongside chroma, hue angle, and saturation metrics—supports cross-functional alignment between R&D formulation teams and production line operators.
FAQ
Does the ColorFlex EZ include NIST-traceable calibration standards?
Yes—each unit ships with a NIST-traceable white tile, ASTM D523/ISO 2813-certified black glass, and a green reference tile, all with individual certification reports.
Can the instrument measure transparent liquids?
Yes, using optional 10 mm pathlength quartz or glass cuvettes; the system automatically compensates for cell window effects via built-in air-zero referencing.
Is the 45°/0° geometry compatible with ASTM D2244 and ISO 11664-4?
Yes—the optical configuration satisfies the geometric requirements of both standards for non-specular reflectance measurement.
What spectral data resolution does the diode array provide?
The 256-channel detector yields interpolated 10 nm reporting intervals with <3 nm optical resolution, meeting the minimum sampling criteria specified in CIE 15:2004.
How is inter-instrument agreement maintained across a multi-unit installation?
HunterLab performs factory inter-instrument agreement testing per BCRA II and BVRA II ceramic tile sets; typical ΔE* ≤ 0.15 (mean) and ≤ 0.25 (max) ensures metrological continuity across fleets.
