Lengguang Tech. S450 Near Infrared Spectrometer
| Brand | Lengguang Tech. |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Original Equipment Manufacturer (OEM) |
| Product Category | Domestic |
| Model | S450 |
| Instrument Type | Laboratory Benchtop |
| Application Scope | Academic & Research Laboratories (Universities, Public Research Institutes) |
| Operating Principle | Grating Scanning Monochromator |
| Wavelength Range | 900–2500 nm |
| Scan Speed | Low / Medium / High Adjustable |
| Spectral Sampling Interval | 0.1–5 nm |
| Measurement Mode | Diffuse Reflectance |
| Chemometrics Software | CAUNIR |
Overview
The Lengguang Tech. S450 Near Infrared Spectrometer is a laboratory-grade, grating scanning monochromator-based NIR instrument engineered for rapid, non-destructive qualitative and quantitative analysis of organic materials containing C–H, O–H, and N–H bonds. Operating across the 900–2500 nm spectral region (corresponding to ~11,111–4000 cm⁻¹), the S450 captures fundamental and overtone vibrational absorption bands essential for predictive modeling in agricultural, food, pharmaceutical, and industrial quality control workflows. Its optical architecture employs front-face dispersion—ensuring sample integrity by eliminating thermal loading during measurement—and integrates a thermoelectrically cooled InGaAs detector for enhanced signal-to-noise ratio and long-term stability. Designed for reproducibility-critical environments, each unit undergoes multi-point wavelength calibration using NIST-traceable reference standards, with calibration points distributed uniformly across the full spectral range to guarantee inter-instrument wavelength accuracy ≤ ±0.2 nm and repeatability ≤ ±0.05 nm.
Key Features
- Front-optics monochromator design prevents sample heating during acquisition, preserving structural integrity and improving measurement reproducibility.
- High-stability optical train incorporating premium-grade components: tungsten-halogen source, gold-coated holographic grating, interference filters, and TE-cooled InGaAs photodetector.
- Integrated integrating sphere accessory enables multi-angle diffuse reflectance collection—critical for heterogeneous or granular samples such as grains, feed pellets, and powdered pharmaceuticals.
- Real-time environmental monitoring: onboard temperature and humidity sensors log ambient conditions directly into each spectrum file for traceable method optimization and GLP-compliant reporting.
- Compact benchtop footprint (540 × 380 × 220 mm) with open-access sample compartment facilitates cleaning, maintenance, and flexible accessory integration.
- USB 2.0 interface ensures reliable, low-latency data transfer compatible with Windows-based laboratory networks and LIMS integration.
Sample Compatibility & Compliance
The S450 supports diverse physical forms—including solids (granules, tablets, films), powders, pastes, and liquids—via interchangeable sampling accessories: standard cup holders, liquid cuvette adapters, and fiber-optic probes. Its 12 nm spectral bandwidth and ≤0.1% stray light performance meet minimum requirements for routine NIR applications outlined in ASTM E1655 (Standard Practices for Infrared Multivariate Quantitative Analysis) and ISO 12099:2017 (Animal feeding stuffs — Guidance on the application of near infrared spectroscopy). While not certified under FDA 21 CFR Part 11 out-of-the-box, the system’s audit trail functionality (user login tracking, method execution logs, parameter change timestamps) provides foundational infrastructure for GxP-aligned validation protocols when deployed within controlled QA/QC environments.
Software & Data Management
The S450 operates with two complementary software modules: the instrument control and acquisition suite (S450 Control), and the dedicated chemometrics platform CAUNIR—developed in collaboration with China Agricultural University. CAUNIR implements digitalized Partial Least Squares (PLS) regression algorithms optimized for NIR spectral matrices, supporting both univariate and multivariate calibration development, cross-validation, outlier detection, and model robustness assessment. It includes built-in tools for spectral preprocessing (SNV, MSC, derivatives), variable selection (VIP, iPLS), and classification modeling (SIMCA, PLS-DA) for authenticity verification and product grading. Role-based access control enforces separation between administrator-level model building/maintenance tasks and operator-level routine analysis, while automated audit trails record all user actions—including method selection, parameter edits, and report generation—in ISO/IEC 17025-aligned chronological logs.
Applications
The S450 delivers validated performance in high-throughput screening and process monitoring scenarios where speed, repeatability, and minimal sample preparation are essential. Typical use cases include protein/fat/moisture quantification in cereal grains and animal feed; moisture and sugar content determination in fruits, dairy products, and confectionery; active pharmaceutical ingredient (API) assay and blend uniformity testing in solid dosage forms; and origin authentication of tobacco leaves or botanical extracts. Its ability to support cross-instrument model transfer—demonstrated across multiple production units—reduces deployment overhead in multi-site laboratories and facilitates centralized method development with decentralized execution.
FAQ
What is the spectral resolution capability of the S450?
The instrument features a fixed spectral bandwidth of 12 nm, optimized for robustness and signal throughput in routine NIR applications. Variable resolution is achieved indirectly via adjustable sampling interval (0.1–5 nm) and smoothing algorithms in CAUNIR.
Does the S450 support transmission measurements?
No—the standard configuration is optimized for diffuse reflectance using an integrating sphere. Transmission measurements require optional fiber-optic probe configurations and are limited to low-absorbing liquid or thin-film samples.
Can CAUNIR models be exported for use on third-party platforms?
CAUNIR generates proprietary binary model files (.cam); however, prediction results and raw spectra are exportable in CSV and JCAMP-DX formats for interoperability with MATLAB, Python (scikit-learn), or commercial chemometrics suites.
Is remote operation supported?
Yes—via secure RDP or VNC connections to the host PC. The USB-connected architecture does not support native Ethernet or Wi-Fi control, but networked file sharing enables centralized data archiving and collaborative model development.
What maintenance is required for long-term wavelength stability?
Annual verification using certified polystyrene or rare-earth oxide standards is recommended. No user-serviceable optical alignment is required; all calibration references are factory-installed and software-accessible through the diagnostic module.
