Yoke L5 IoT-Enabled Visible Spectrophotometer

Overview

The Yoke L5 IoT-Enabled Visible Spectrophotometer is a precision optical instrument engineered for routine and research-grade quantitative absorbance measurements in the visible to near-infrared spectral region (320–1100 nm). It employs a Czerny-Turner monochromator architecture incorporating a holographic blazed grating—optimized for high diffraction efficiency and minimal aberration—to deliver consistent spectral resolution across its operating range. The pseudo-double-beam (ratio-beam) optical design compensates for source intensity drift and detector sensitivity variation in real time, significantly improving measurement stability and baseline reproducibility. With a fixed spectral bandwidth of 2 nm and wavelength accuracy of ±0.3 nm, the L5 meets essential performance criteria for method validation under ISO 8579, ASTM E275, and USP guidelines for spectrophotometric analysis. Its solid-state tungsten-halogen lamp ensures stable output over extended operation cycles, while the 24-bit analog-to-digital converter (AD chip, Analog Devices) enables high dynamic range digitization with photometric noise <0.002 Abs (at 500 nm, 1 s integration).

Key Features

• 7-inch high-resolution (1024 × 768) capacitive color touchscreen interface with intuitive icon-driven navigation—designed for glove-compatible operation in laboratory environments.
• Integrated dual-band Wi-Fi (2.4 GHz/5 GHz) and Bluetooth 5.0 modules enabling wireless data export, remote instrument status monitoring, and direct thermal printing without physical cabling.
• Cloud connectivity via YOKE@Cloud Data platform: scan QR code to authenticate and synchronize measurement logs, calibration records, and user-defined methods; supports TLS 1.2 encrypted upload and role-based access control.
• Onboard memory stores up to 500 individual sample measurements and 30 multi-point calibration curves; all data exported in .CSV format compatible with Microsoft Excel, OriginLab, and MATLAB without proprietary software dependency.
• USB-A port supports mass-storage-mode file transfer and firmware updates; optional Yokelab PC software (Windows/macOS) provides extended functionality including full-spectrum scanning, kinetic time-course analysis, nucleic acid quantification (A260/A280), derivative spectroscopy, and overlay plotting.
• Automatic wavelength positioning and lamp switching (tungsten only, optimized for 320–1100 nm) reduce operator intervention and minimize warm-up-induced drift during sequential assays.

Sample Compatibility & Compliance

The L5 accommodates standard 10 mm pathlength cuvettes (glass, quartz, or plastic) and supports optional micro-volume adapters (e.g., 50–200 µL capillary cells). It complies with electromagnetic compatibility (EMC) requirements per IEC 61326-1:2013 and safety standards IEC 61010-1:2010. While not certified for GMP production environments, its audit-trail-capable data management (via Yokelab software with optional 21 CFR Part 11 compliance package) supports GLP-aligned workflows in academic, environmental, and quality control laboratories. Instrument calibration traceability follows NIST-traceable tungsten lamp and neutral density filter protocols.

Software & Data Management

Data integrity is reinforced through timestamped metadata (operator ID, date/time, instrument serial number, wavelength setting, slit width, integration time) embedded in every exported .CSV file. Yokelab software offers configurable report templates compliant with ISO/IEC 17025 documentation requirements. Cloud synchronization includes version-controlled method storage, automatic backup to redundant AWS S3 buckets, and configurable retention policies (30/90/365 days). All firmware updates undergo SHA-256 signature verification prior to installation.

Applications

The L5 serves as a primary analytical tool in water quality testing (e.g., COD, ammonia, nitrate per APHA Standard Methods), food and beverage QA (colorimetric enzyme assays, pigment concentration), pharmaceutical excipient analysis (iron content, residual solvents), and educational spectroscopy labs. Its low stray light (<0.05% T at 360 nm) ensures reliable quantitation of highly absorbing samples—critical for dye concentration assays and protein denaturation studies. The kinetic module supports enzyme activity monitoring (e.g., β-galactosidase hydrolysis) at user-defined intervals from 0.1 s to 9999 s.

FAQ

Does the L5 support UV-range measurements below 320 nm?
No—the L5 is configured exclusively for the visible and near-IR spectrum (320–1100 nm) using a tungsten-halogen lamp and optimized optics; UV capability requires deuterium lamp integration and fused silica optics, available in the L6 UV-Vis model.
Can raw spectral data be exported in ASCII or binary formats?
Yes—full-scan spectra acquired via Yokelab software are exportable as tab-delimited ASCII (.txt) or .CSV files containing wavelength (nm) and absorbance/transmittance columns, suitable for third-party chemometrics packages.
Is firmware update performed locally or only via cloud sync?
Both options are supported: updates may be installed manually via USB drive or automatically pushed over Wi-Fi when connected to YOKE@Cloud with administrator privileges enabled.
What is the maximum sampling rate during kinetic mode?
The L5 achieves a minimum interval of 100 ms between consecutive absorbance readings, enabling resolution of rapid reaction kinetics such as fast pH-indicator transitions or photochemical decay processes.
Are calibration certificates provided with shipment?
A factory-issued calibration report (including wavelength accuracy verification at 365, 435, 546, and 700 nm using NIST-traceable filters) is included; ISO/IEC 17025-accredited calibration is available as a paid service through Yoke’s Shanghai metrology lab.