HunterLab UltraScan Pro Spectrophotometric Color Difference Meter

Overview

The HunterLab UltraScan Pro is a high-precision benchtop spectrophotometric color difference meter engineered for rigorous industrial and regulatory color measurement environments. It operates on the principle of diffuse illumination and 8° viewing geometry (d/8°), conforming to international standards for reflectance and transmittance colorimetry. The instrument utilizes a pulsed xenon lamp as its broadband light source, delivering stable, flash-based illumination without thermal drift—critical for long-term calibration stability and repeatable spectral acquisition. Its core optical architecture features a high-efficiency integrating sphere coated with proprietary BaSO₄-based diffuse reflective material, engineered to resist yellowing and spectral degradation over time. Unlike filtered photometric devices, the UltraScan Pro captures full-spectrum data across 350–1050 nm at 5 nm intervals, enabling quantitative analysis not only of CIELAB (L*a*b*), CMC, and ΔE metrics but also of non-chromatic optical properties including haze, absorbance, luminance, whiteness (CIE, Ganz), yellowness (ASTM E313), K/S (Kubelka-Munk), metamerism index, and opacity. This spectral foundation supports both routine quality control and advanced R&D applications requiring UV–Vis–NIR characterization.

Key Features

• Full-spectrum acquisition from 350 nm to 1050 nm, with user-definable measurement ranges (e.g., 400–700 nm for standard colorimetry or extended NIR for camouflage and IR-responsive materials)
• High-resolution spectral data at 1.37 nm effective bandwidth, achieved via a precision narrow-band holographic grating and multi-point silicon photodiode array detection
• Pulsed xenon illumination minimizes sample heating and eliminates lamp aging effects; integrated 400 nm UV cutoff filter suppresses excessive fluorescence excitation while preserving UV-sensitive measurements
• Integrating sphere with spectrally stable, non-yellowing coating ensures consistent BRDF-independent reflectance collection over years of operation
• Benchtop form factor with motorized port door, automatic calibration verification, and dual-aperture options (e.g., 25 mm and 40 mm) for flexible sample accommodation
• Compliance-ready design supporting audit trails, electronic signatures, and secure user roles when paired with validated EasyMatch QC software

Sample Compatibility & Compliance

The UltraScan Pro accommodates opaque solids, translucent films, liquids, powders, and textured surfaces—including woven textiles, molded plastics, pharmaceutical tablets, glass substrates, and food matrices. Its d/8° geometry with specular component included (SCI) or excluded (SCE) modes enables differentiation between surface appearance and inherent colorant performance. Regulatory alignment includes ASTM D2244 (color difference limits), ASTM E2539 (instrumental color measurement for medical devices), ISO 11664 (colorimetry fundamentals), and USP (color assessment in pharmaceuticals). When configured with EasyMatch QC under 21 CFR Part 11 compliance mode, the system provides full traceability: calibrated reference tile history, operator log entries, method version control, and immutable audit logs—meeting GLP and GMP requirements for regulated laboratories.

Software & Data Management

EasyMatch QC serves as the validated software platform for instrument control, method development, statistical process control (SPC), and report generation. It supports customizable pass/fail tolerances per parameter (e.g., ΔE₀₀, whiteness, haze), automated batch reporting in PDF or CSV, and integration with LIMS via ODBC or HL7. The software enforces role-based access control (RBAC), digital signature capture, and electronic record retention per ALCOA+ principles. All spectral scans are stored with metadata (date/time, operator ID, calibration status, aperture used), enabling retrospective spectral re-analysis without re-measurement. Optional EasyMatch QC Enterprise adds multi-instrument synchronization, centralized database deployment, and automated firmware update management.

Applications

• Textiles & Apparel: Quantitative evaluation of dye lot consistency, metamerism assessment under multiple illuminants (D65, A, F2), and NIR reflectance profiling for military camouflage validation
• Coatings & Plastics: Measurement of pigment dispersion uniformity, weathering-induced color shift (QUV/Q-SUN correlation), and opacity/hide performance in architectural paints
• Pharmaceuticals: Solid dosage color release testing per USP , excipient interaction studies, and stability-indicating assays for photo-degradation
• Food & Beverage: Objective quantification of browning (Hazen units), fruit ripeness indices (a*/b* ratio), and packaging transmission consistency
• Electronics & Displays: Reflectance profiling of anti-glare coatings, OLED substrate color neutrality, and IR-filter transmission in sensor modules

FAQ

What spectral range is active during a standard color measurement?
By default, the UltraScan Pro acquires data from 400 nm to 700 nm at 5 nm intervals for CIE-compliant colorimetric calculations; however, users may select extended ranges (350–1050 nm) for specialized applications such as UV-cured ink analysis or NIR-absorbing material characterization.
Does the instrument support both reflectance and transmittance measurements?
Yes—the UltraScan Pro is configured with dual measurement ports: a top port for reflectance (including textured or curved samples) and a bottom port with liquid cell holder and transmission accessories for clear/colored solutions, films, and glasses.
How is long-term calibration stability maintained?
Instrument calibration is verified daily using NIST-traceable white and black ceramic tiles; the system logs all verification results and triggers alerts if deviations exceed ±0.02 ΔE*ab, ensuring ongoing metrological integrity without manual intervention.
Can spectral data be exported for third-party analysis?
All raw spectral scans (.spc files) and processed color data (.csv, .xml) are fully exportable with embedded metadata, enabling offline modeling in MATLAB, Python (NumPy/Pandas), or chemometric platforms such as Unscrambler or Pirouette.
Is the UltraScan Pro suitable for ISO/IEC 17025-accredited laboratories?
Yes—when operated with documented SOPs, scheduled performance verification, and EasyMatch QC in 21 CFR Part 11 mode, the system meets technical requirements for uncertainty estimation, traceability, and impartiality as specified in ISO/IEC 17025:2017 Clause 6.4 and 6.5.