HunterLab D25LT Benchtop Spectrophotometric Colorimeter
| Brand | HunterLab |
|---|---|
| Origin | USA |
| Manufacturer Type | Authorized Distributor |
| Import Status | Imported |
| Model | D25LT |
| Product Category | Spectrophotometric Colorimeter |
| Instrument Type | Benchtop |
| Optical Geometry | 0/45° Integrating Sphere |
| Light Source | Full-Spectrum LED Array |
| Spectral Range | 400–700 nm |
| Repeatability (ΔE*ab) | ≤0.03 |
Overview
The HunterLab D25LT is a benchtop spectrophotometric colorimeter engineered for precise, repeatable color measurement of opaque, textured, and heterogeneous food products—including biscuits, crackers, baked goods, powders, pastes, and viscous liquids. It operates on the principle of diffuse reflectance spectroscopy under standardized 0/45° illumination geometry, compliant with CIE No. 15 and ASTM E308 guidelines. The instrument employs a full-spectrum LED array (400–700 nm) with high spectral stability and minimal thermal drift, enabling accurate calculation of CIELAB (L*, a*, b*), CMC, ΔE00, and other industry-standard color difference metrics. Designed specifically for QC laboratories in food manufacturing, R&D centers, and academic food science departments, the D25LT delivers metrological traceability to NIST-certified standards and supports routine calibration verification per ISO 13655.
Key Features
- Benchtop form factor with compact footprint—optimized for space-constrained lab environments without compromising optical performance.
- Integrated 7-inch high-resolution color LCD touchscreen with alphanumeric virtual keyboard for intuitive sample naming, parameter configuration, and real-time data visualization.
- Dual-orientation sample port: configurable for upward-facing measurement (ideal for samples in Petri dishes or shallow cups) or downward-facing measurement (suited for large trays, conveyor-mounted fixtures, or elevated sample holders).
- Robust mechanical architecture rated for continuous operation in industrial settings (IP52-rated enclosure; operating temperature range: 10–40 °C; relative humidity: 10–80% non-condensing).
- Onboard thermal printer for immediate hardcopy output of measurement reports—including sample ID, date/time stamp, spectral reflectance curves, and pass/fail status against user-defined tolerances.
- Embedded Linux-based operating system with firmware upgradability via USB or network interface—ensuring long-term compatibility with evolving regulatory requirements.
Sample Compatibility & Compliance
The D25LT accommodates irregular, non-homogeneous, and low-gloss surfaces typical of baked snack products—including layered biscuits, sugar-dusted cookies, crumbly crackers, and extruded cereal pieces. Its 0/45° optical geometry minimizes directional bias from surface texture while maintaining compliance with ISO 8254-1 (paper and board), ISO 9276-2 (particle size distribution correlation), and AOAC Official Method 998.12 for color evaluation in processed foods. All measurement protocols support audit-ready documentation: timestamped raw spectra, operator ID logging, and calibration history are retained onboard and exportable for GLP/GMP compliance. The system meets FDA 21 CFR Part 11 requirements when deployed with validated networked software (e.g., EasyMatch QC v5.x) and appropriate access controls.
Software & Data Management
Data acquisition, analysis, and reporting are managed through HunterLab’s EasyMatch QC software suite—compatible with Windows OS and accessible via Ethernet or Wi-Fi. The instrument supports direct CSV, XML, and PDF export to LIMS or ERP systems. Measurement histories—including spectral data, statistical summaries (mean, SD, CPK), and trend charts—are stored with full version control and user-level permissions. Audit trails record all critical events: calibration actions, method modifications, user logins, and report generation. Optional cloud synchronization enables centralized fleet management across multi-site production facilities.
Applications
- Batch-to-batch color consistency validation in biscuit and cracker production lines.
- Raw material qualification (e.g., flour, cocoa powder, caramel colorants) against master standards.
- Shelf-life studies tracking color degradation under accelerated aging conditions.
- Formulation development for new product variants requiring precise hue and chroma targets.
- Supplier quality assurance—comparing incoming ingredients against contractual color specifications (e.g., L* ≥ 72.5 ± 0.8, a* = −1.2 ± 0.3).
- Academic research in food physics and sensory science, including correlation of instrumental color with consumer perception panels.
FAQ
What is the recommended calibration frequency for routine QC use?
Daily zero and white calibration is advised before first use and after extended idle periods; verification with a certified ceramic tile standard should occur at least once per shift.
Can the D25LT measure translucent or liquid samples?
Yes—when used with optional transmission accessories (e.g., cuvette holder and path-length adapters), it supports transmittance mode for syrups, dairy beverages, and clarified extracts.
Is the instrument compatible with third-party statistical process control (SPC) platforms?
Yes—via OPC UA or ODBC-compliant data export, enabling seamless integration with Minitab, InfinityQS, or custom SPC dashboards.
Does the D25LT support multiple color spaces and tolerancing methods?
Yes—including CIELAB, CIELCh, XYZ, Yxy, and Hunter L,a,b—with customizable ΔE metrics (ΔE*ab, ΔE00, CMC(2:1), BFD) and elliptical or rectangular tolerance zones.
How is measurement repeatability verified?
Repeatability (≤0.03 ΔE*ab) is confirmed per ASTM D2244 using a stable white reference tile under controlled ambient lighting; full validation reports are provided with each unit shipment.
