HunterLab ColorFlex EZ 45°/0° Spectrophotometer

Overview

The HunterLab ColorFlex EZ 45°/0° Spectrophotometer is a benchtop color measurement instrument engineered for precision, repeatability, and operational simplicity in quality control laboratories and production environments. It employs a CIE-compliant 45°/0° optical geometry—where illumination is delivered via four 45° circumferential light sources onto the sample, and reflected light is collected perpendicularly at 0° through an integrating sphere. This configuration closely emulates human visual perception under standardized viewing conditions, making it especially suitable for evaluating surface color of textured, matte, or structured materials where diffuse reflectance dominates. Unlike d/8° instruments, the 45°/0° design minimizes sensitivity to surface texture, gloss variation, and directional scattering—ensuring high inter-instrument agreement and correlation with visual assessment. The system utilizes a silicon photodiode array spectrometer with grating dispersion, covering the full visible spectrum from 400 to 700 nm at 10 nm resolution, enabling calculation of CIE XYZ, L*a*b*, L*C*h°, and multiple color difference metrics (ΔE*ab, ΔE00, ΔEcmc) under standard illuminants (A, C, D65, F2, etc.) and observers (2° and 10°).

Key Features

• True 45°/0° optical geometry compliant with CIE 15:2018 and ASTM E308–22 for high visual correlation
• Benchtop form factor occupying minimal lab footprint (< 25 cm depth), designed for integration into QC workstations
• Three dedicated USB ports supporting simultaneous connection of keyboard, barcode scanner, and USB flash drive—enabling rapid sample ID entry, automated data capture, and offline transfer without PC dependency
• Onboard memory stores up to 250 reference standards—including user-defined tolerances (ΔL*, Δa*, Δb*, ΔE*, pass/fail thresholds) and 2000 sample measurements with timestamp and operator ID
• Intuitive front-panel interface with “One-Touch Measure” functionality; no software required for basic operation
• Integrated spectral acquisition and real-time display of color coordinates, color difference values, spectral curves, and chromaticity diagrams
• Robust mechanical design with sealed optical path and temperature-stabilized detector—optimized for stable performance across ambient lab conditions (15–30 °C)

Sample Compatibility & Compliance

The ColorFlex EZ accommodates a broad range of physical sample forms without requiring accessory swaps: flat opaque solids (e.g., painted panels, plastic sheets), free-flowing powders (coffee, spices, pharmaceutical excipients), viscous liquids (sauces, dairy, cleaning agents), granular media (sugar, resins), semi-transparent gels (jellies, hydrogels), and irregular particulates (nuts, cheese curds). Optional sample holders—including liquid cells (10 mm pathlength), powder cups, and granule trays—are available to ensure consistent presentation and minimize measurement variability. The instrument meets international colorimetric standards including ISO 11664-4 (CIE colorimetry), ASTM D2244 (color difference calculation), and USP <1061> (color measurement in pharmaceuticals). When used with EasyMatch QC software, it supports 21 CFR Part 11-compliant electronic records, audit trails, and user access controls—fulfilling GLP and GMP documentation requirements.

Software & Data Management

While fully functional as a standalone device, the ColorFlex EZ integrates seamlessly with HunterLab’s EasyMatch QC v5.x software suite. This Windows-based application enables advanced data visualization (trend charts, SPC control charts, spectral overlays), method scripting, report generation (PDF/CSV/XLSX), and database synchronization across multiple instruments. All measurements include embedded metadata: date/time stamp, operator ID, instrument serial number, illuminant/observer selection, and measurement mode. Audit-trail functionality logs all parameter changes, calibration events, and result modifications—essential for regulated industries such as food, pharma, and cosmetics. USB flash drive export supports secure offline data migration and backup without network exposure.

Applications

The ColorFlex EZ serves as a primary color verification tool across diverse sectors where appearance consistency directly impacts brand integrity and regulatory acceptance. In food manufacturing, it quantifies batch-to-batch hue variation in ground coffee, tomato paste, powdered milk, and fruit juices—supporting compliance with USDA or EU labeling guidelines. In coatings and plastics, it validates color match against master standards for automotive trim, appliance housings, and architectural panels. In pharmaceuticals, it verifies shade uniformity of tablets, capsules, and lyophilized powders per USP <1061>. Additional validated use cases include quality release testing of detergents, cementitious materials, adhesives, and cosmetic emulsions—where both chromaticity and spectral shape influence consumer perception and functional performance.

FAQ

Is the ColorFlex EZ suitable for measuring transparent or translucent samples?
Yes—when used with appropriate liquid cells or transmission accessories, it measures transmittance color of clear liquids and thin films. For semi-translucent solids (e.g., cheese, gels), reflectance mode with diffuser plate yields reproducible results.
Does the instrument require annual recalibration?
HunterLab recommends annual traceable recalibration using NIST-traceable ceramic tiles. Internal diagnostics and daily verification with supplied white tile ensure ongoing accuracy between service intervals.
Can measurement data be exported directly to LIMS or ERP systems?
Yes—EasyMatch QC supports ODBC connectivity and configurable CSV/XML export templates compatible with major LIMS platforms (e.g., LabWare, Thermo Fisher SampleManager) and enterprise databases.
What is the warranty coverage?
Standard warranty is 24 months parts and labor, extendable to 36 months with HunterLab Service Agreement, which includes priority technical support, firmware updates, and on-site service options.
Is training included with purchase?
Yes—HunterLab provides complimentary remote operator training (2 hours), downloadable SOP templates, and access to the HunterLab Knowledge Base with video tutorials, application notes, and troubleshooting guides.