HunterLab ColorQuest XT Spectrophotometer

Overview

The HunterLab ColorQuest XT is a precision-engineered benchtop spectrophotometer designed for rigorous color measurement and quantitative spectral analysis in industrial quality control and R&D laboratories. Operating on the fundamental principle of double-beam spectral photometry, it captures full-spectrum reflectance and transmittance data across the visible range (400–700 nm) using a 256-element diode array detector coupled with a high-resolution concave holographic grating. Its d/8° integrating sphere geometry—compliant with CIE No. 15, ISO 7724-1, ASTM E1164, and DIN 5033 Teil 7—ensures consistent illumination and collection of diffuse + specular (SCI) or diffuse-only (SCE) components, enabling accurate color evaluation regardless of surface texture or gloss. The instrument’s optical architecture incorporates dual-path beam stabilization, minimizing drift and enhancing long-term photometric stability essential for GLP-compliant workflows.

Key Features

• Robust d/8° integrating sphere (152 mm / 6″ diameter) coated with Spectraflect®, a highly stable, near-Lambertian reflective material resistant to yellowing under repeated xenon exposure
• Pulsed xenon lamp calibrated to simulate CIE Standard Illuminant D65; rated for >1,000,000 flashes with field-replaceable module design
• Automatic SCI/SCE mode switching via motorized port shutter—eliminates manual configuration errors during routine reflectance measurements
• Triple-opening transmission chamber accommodating thick, irregular, or multi-layered samples without repositioning
• Motorized LAV/SAV/XX-SAV aperture selection (25.4 mm / 1″, 9.5 mm / 3/8″, and 4 mm measurement areas) with real-time optical path compensation
• Sub-second measurement cycle (<1 s per reading) and minimal inter-measurement interval (3 s), optimized for high-throughput production line verification
• Status LED indicators and tactile test button enable intuitive operation in glove-compatible or low-visibility environments

Sample Compatibility & Compliance

The ColorQuest XT supports a broad spectrum of physical sample forms—including opaque solids (e.g., molded plastics, painted panels), translucent films (e.g., PET, PVC), transparent liquids (e.g., solvents, beverages), and semi-solid gels—without requiring hardware modification. Its transmission mode accommodates both direct (directional) and total (diffuse + direct) transmittance per ASTM D1003 and ISO 13468. Reflectance compliance covers CIE 15:2018, ISO 7724-1:2019, ASTM E1164-22, DIN 5033-7:2020, and JIS Z 8722:2012 Condition C. For regulated industries, measurement traceability aligns with NIST-traceable calibration standards, and audit-ready data logs support FDA 21 CFR Part 11 requirements when used with optional compliant software modules.

Software & Data Management

Instrument control and data analysis are executed via HunterLab’s Universal Software platform (v5.x), which provides configurable workspaces for method-driven workflows, statistical process control (SPC) charting, and multi-instrument fleet management. All spectral data (10 nm reporting intervals, <3 nm effective bandwidth) are stored with full metadata: date/time stamp, operator ID, sample ID, geometry setting, aperture size, illuminant/observer condition, and instrument calibration status. Raw .qtx files retain unprocessed diode array output for retrospective reprocessing. Export formats include CSV, XML, and PDF reports compliant with ISO/IEC 17025 documentation requirements. Optional IQ/OQ/PQ validation packages and electronic signature modules facilitate GMP/GLP implementation in pharmaceutical and food manufacturing settings.

Applications

This spectrophotometer serves as a primary color metrology tool across vertically integrated supply chains. In polymer compounding, it quantifies yellowness index (YI E313), whiteness (CIE WH), and APHA/Pt-Co color scales for resin pellets and masterbatches. In coatings formulation, it validates batch-to-batch consistency against digital standards while correcting for metamerism using multi-illuminant comparison. Textile labs apply it to assess dye lot uniformity under D65 and F2 fluorescent conditions per AATCC TM173. Beverage and pharmaceutical manufacturers rely on its turbidity (NTU), haze (%), and spectral transmittance profiles for clarity verification per USP and EP 2.2.2. Additional validated indices include Gardner, Saybolt, and ASTM D6166 color scales for specialty chemicals and lubricants.

FAQ

Does the ColorQuest XT require annual lamp replacement?
No—the pulsed xenon lamp is rated for over one million flashes and typically operates for 5+ years in standard QC environments; replacement is user-performed and does not require recalibration.
Can the instrument measure APHA and Pt-Co color units directly?
Yes—preconfigured calculation engines compute APHA (ASTM D1209), Pt-Co (ASTM D5386), and Gardner (ASTM D1544) indices from raw spectral data without external lookup tables.
Is SAV (Small Area View) measurement supported out-of-the-box?
The 9.5 mm LAV and 4 mm XX-SAV apertures are optional accessories; installation is tool-free and automatically recognized by firmware upon insertion.
How is measurement traceability maintained for regulatory audits?
Each unit ships with NIST-traceable calibration certificates; software logs record every calibration event, including date, technician ID, standard reference tile used, and deviation metrics per ISO/IEC 17025 clause 6.4.
Does the system support networked deployment in a multi-site enterprise?
Yes—Universal Software supports centralized database hosting, role-based access control, and synchronized method libraries across geographically distributed instruments via secure HTTPS or VPN tunnels.