Yoke i3 Visible Spectrophotometer

Overview

The Yoke i3 Visible Spectrophotometer is a precision single-beam optical instrument engineered for routine absorbance and transmittance measurements across the visible spectrum (360–900 nm). Based on Beer–Lambert law-compliant photometric principles, it employs a high-stability dual-lamp architecture—standardized with a long-life tungsten-halogen source—and integrates a high-resolution photodiode array (PDA) detector for rapid signal acquisition and improved photometric reproducibility. Its optical design incorporates a newly sourced high-efficiency diffraction grating, enabling consistent spectral resolution and reduced wavelength drift over extended operation cycles. The instrument is calibrated per ISO 6223 and ASTM E275 standards for visible spectrophotometric performance verification, supporting traceable measurement integrity in QC laboratories, academic teaching labs, and industrial process control environments where regulatory documentation is required.

Key Features

• 7-inch capacitive touchscreen interface (1024 × 768 resolution) with intuitive icon-driven navigation—designed for glove-compatible operation and minimal training overhead.
• Automated wavelength calibration and lamp switching logic ensures zero manual intervention during multi-wavelength or time-resolved assays.
• Embedded Wi-Fi, Bluetooth 4.2, and USB 2.0 interfaces enable seamless integration into networked lab environments—supporting direct data export to LIMS, cloud storage via YOKE@Cloud Data platform, and real-time printing via compatible thermal or inkjet printers.
• Optimized mechanical wavelength drive mechanism reduces positional hysteresis and acoustic noise—improving long-term repeatability (≤1 nm) and minimizing maintenance intervals.
• Comprehensive firmware-based photometric validation routines—including stray light assessment at 420 nm using NaNO₂ reference solution—facilitate internal instrument qualification per GLP and ISO/IEC 17025 requirements.

Sample Compatibility & Compliance

The i3 accommodates standard 10-mm rectangular cuvettes (glass, quartz, or plastic), as well as optional accessories including micro-volume holders (down to 50 µL), flow cells, and temperature-controlled cell changers. It complies with IEC 61010-1:2010 for electrical safety and meets CE marking requirements for electromagnetic compatibility (EMC Directive 2014/30/EU). While classified as a visible-range instrument, its extended wavelength capability (up to 900 nm) supports chlorophyll-a quantification (663 nm), carotenoid analysis (450–480 nm), and dye stability monitoring in textile and food applications. All firmware and data handling modules are designed to support audit trails and user-access logging—enabling alignment with FDA 21 CFR Part 11 readiness when deployed with validated YOKE LabSuite software.

Software & Data Management

The embedded operating system supports both standalone and PC-connected workflows. When linked to Windows-based PCs via USB or Wi-Fi, the instrument interfaces with YOKE LabSuite v3.2—a GxP-aligned application offering full 21 CFR Part 11 compliance options (electronic signatures, role-based permissions, and immutable audit logs). Data export formats include CSV, TXT, and XML; spectral overlays and derivative calculations are processed in real time without external post-processing. Cloud synchronization via YOKE@Cloud Data allows secure, encrypted transfer of method files, calibration records, and raw spectra—accessible through QR-code-scanned mobile authentication. All stored datasets retain full metadata: timestamp, operator ID, instrument serial number, and environmental conditions (if external sensor input enabled).

Applications

The i3 serves core analytical functions in pharmaceutical excipient testing (e.g., colorimetric assay of iron content per USP ), environmental water quality monitoring (nitrate/nitrite detection at 540 nm), food and beverage QA (anthocyanin concentration in fruit juices), and educational spectroscopy labs. Its kinetic mode supports enzyme activity assays (e.g., NADH oxidation at 340 nm), while nucleic acid quantification (A260/A280 ratio) and protein estimation (Bradford assay at 595 nm) are preconfigured in method templates. The instrument’s low stray light (<0.5% T) and stable baseline drift (<0.002 A/h) ensure reliable low-concentration quantitation down to 0.01 AU—critical for dilute biological samples and catalytic reaction intermediates.

FAQ

Does the i3 support UV-range measurements?
No—the standard i3 model is optimized for the visible range (360–900 nm). UV extension (to 320 nm) requires optional deuterium lamp integration and quartz cuvette usage, available as a factory-configured variant (i3-UV).
Can the instrument be validated for GMP environments?
Yes—when operated with YOKE LabSuite under documented IQ/OQ protocols and paired with certified reference materials (e.g., NIST-traceable holmium oxide filters), the i3 meets foundational requirements for equipment qualification in regulated manufacturing.
Is spectral data export compatible with third-party analysis tools like Origin or MATLAB?
Yes—all scan data are exported in ASCII-delimited formats (CSV/TXT) with wavelength and absorbance columns, enabling direct import and scripting-based batch processing.
What is the expected lifetime of the halogen lamp?
The integrated tungsten-halogen source is rated for ≥2,000 hours of continuous operation under typical laboratory duty cycles (8 hrs/day, 5 days/week), with automatic shutdown after 15 minutes of inactivity to extend service life.
How does the instrument handle cuvette misalignment or scratches?
The PDA-based detection system provides inherent spatial averaging across the beam profile, reducing sensitivity to minor cuvette imperfections. However, users are advised to follow ISO 10929 guidelines for cuvette orientation and cleaning to maintain photometric accuracy.