HunterLab USPRO Spectrophotometric Color Difference Meter
| Brand | HunterLab |
|---|---|
| Origin | USA |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | USPRO |
| Product Type | Spectrophotometric Colorimeter |
| Instrument Type | Benchtop |
| Optical Geometry | d/8° Integrating Sphere |
| Light Source | Pulsed Xenon Lamp |
| Spectral Range | 350–1050 nm |
| Repeatability | ΔE*ab ≤ 0.02 (mean, CIE Lab) |
Overview
The HunterLab USPRO is a high-precision benchtop spectrophotometric color difference meter engineered for metrologically rigorous color measurement across visible and near-infrared (NIR) spectral domains. Based on the foundational CIE L*a*b* color space—originated by Richard S. Hunter in 1942—the USPRO delivers traceable, physically meaningful color data rooted in photometric and radiometric principles. Its optical architecture employs a dual-beam, dual-grating design with a 15.2 cm (6″) integrating sphere coated with Spectraflect®, enabling true d/8° geometry with automatic specular component inclusion or exclusion (SCI/SCE). The instrument utilizes a pulsed xenon lamp to simulate standardized illuminants—including CIE D65—with full spectral correction across 350–1050 nm. This extended spectral coverage supports not only conventional colorimetric evaluation (L*, a*, b*, ΔE*ab, whiteness, yellowness) but also NIR-sensitive applications such as low-emissivity (Low-E) glass characterization, camouflage fabric analysis, and optically functional coatings where chromatic behavior beyond 700 nm is critical.
Key Features
- True dual-beam, dual-grating optical system for enhanced photometric stability and long-term calibration integrity
- Ultra-broad spectral range: 350–1050 nm, with 5 nm reporting interval and <2 nm effective bandwidth (1.37 nm FWHM)
- High-resolution detection: 512-element silicon photodiode array with 0.1 nm wavelength accuracy and 0.003% photometric resolution
- Three selectable measurement apertures: 19 mm (LAV), 9 mm (MAV), and 4 mm (SAV), optimized for heterogeneous or small-area samples
- Integrated sample viewing lamp and adjustable mirror for precise visual alignment of opaque and textured surfaces
- Large transmission compartment accommodating cuvettes up to 80 mm path length, supporting both total transmittance and diffuse transmittance measurements
- Compliance with CIE No. 15:2018, ASTM E308, ASTM D2244, ISO 7724, DIN 5033, and JIS Z 8722 standards
- Designed for GLP/GMP environments: supports audit-trail-enabled software (EasyMatch-QC), 21 CFR Part 11-compliant user access control, and electronic signature functionality
Sample Compatibility & Compliance
The USPRO accommodates a wide range of physical sample types—including transparent liquids, translucent films, opaque solids, powders, pastes, and granular materials—without requiring specialized accessories for most routine measurements. Its large sample port and flexible aperture options enable consistent evaluation of textured, curved, or irregularly shaped specimens common in textile, automotive, and aerospace manufacturing. For pharmaceutical and food-grade applications, the instrument meets USP requirements for color measurement repeatability and spectral fidelity. All optical components are factory-calibrated against NIST-traceable standards, and the system supports periodic verification using certified ceramic tiles and liquid standards compliant with ASTM E2539. Regulatory documentation—including IQ/OQ/PQ protocols, calibration certificates, and material traceability records—is available upon request for FDA, EMA, or MHRA audits.
Software & Data Management
The USPRO operates natively with HunterLab EasyMatch-QC v5.x—a validated, multi-language color management platform supporting method-based workflows, statistical process control (SPC), and cross-instrument data harmonization. The software enables full spectral data export (CSV, XML, CxF/XRGA), custom index calculation (APHA, Gardner, Saybolt, Haze, Yellowness Index ASTM E313, Whiteness Index CIE/ISO 11475), and K/S (Kubelka-Munk) analysis for pigment concentration modeling. All measurement sessions are timestamped and logged with operator ID, instrument ID, calibration status, and environmental metadata (ambient temperature/humidity if connected to external sensors). Data encryption, role-based permissions, and automated backup to network drives or cloud repositories ensure compliance with ISO/IEC 27001 information security frameworks.
Applications
The USPRO serves as a reference-grade tool in industries demanding quantitative color consistency under stringent regulatory or technical constraints. In plastics and polymer manufacturing, it quantifies batch-to-batch variation in black masterbatches and carbon-loaded compounds where conventional 400–700 nm instruments exhibit saturation artifacts. In architectural glass production, its NIR capability validates spectral selectivity of Low-E coatings across solar heat gain coefficient (SHGC) relevant bands. For military-spec textiles, it measures metamerism indices under multiple illuminants (D65, A, F2, F7) to assess camouflage performance across daylight and artificial lighting conditions. Additional validated use cases include: pigment dispersion analysis in coatings; haze and clarity assessment per ASTM D1003; APHA/Pt-Co color grading of purified solvents; and reflectance uniformity mapping of OLED substrates prior to thin-film deposition.
FAQ
Does the USPRO support both SCI and SCE measurement modes?
Yes—the instrument automatically switches between Specular Component Included (SCI) and Specular Component Excluded (SCE) configurations via motorized baffle control, enabling direct comparison of surface texture effects on color appearance.
Is spectral data export supported for third-party analysis?
Yes—full 350–1050 nm spectral reflectance/transmittance curves can be exported in CSV, XML, or CxF format for integration with MATLAB, Python, or proprietary spectral modeling tools.
What calibration standards are required for daily verification?
HunterLab recommends daily verification using the included white ceramic tile (certified per ASTM E2539) and optional liquid standards for transmission validation; annual recalibration against NIST-traceable references is advised.
Can the USPRO measure fluorescence?
No—the USPRO does not incorporate UV-excitation sources or fluorescence correction algorithms; for fluorescent materials, HunterLab’s UltraScan VIS+ or MiniScan EZ with UV filter options are recommended.
Is remote operation supported?
Yes—via USB or RS-232 interface, the instrument integrates with factory automation systems (SCADA/MES) using Modbus RTU or HunterLab’s native API for unattended batch measurement sequences.
