Shenchanghong CHM-301 Benchtop COD, Ammonia-Nitrogen and Total Phosphorus Analyzer

Overview

The Shenchanghong CHM-301 is a benchtop multi-parameter spectrophotometric water quality analyzer engineered for precise, routine quantification of Chemical Oxygen Demand (COD), Ammonia-Nitrogen (NH₃-N), and Total Phosphorus (TP) in laboratory environments. It operates on the principle of colorimetric analysis—where analyte-specific reagents induce chromogenic reactions proportional to concentration—and measures absorbance at optimized wavelengths using a stable LED light source and narrow-band interference filters. Designed for compliance with standard methods including ISO 6060 (COD), ISO 7150-1 (ammonia), and ISO 6878 (total phosphorus), the CHM-301 delivers traceable, reproducible results suitable for environmental monitoring laboratories, municipal wastewater treatment facilities, academic research groups, and regulatory QA/QC departments. Its compact footprint (340 × 250 × 130 mm) and low power draw (<10 W) support integration into space-constrained lab benches without compromising analytical integrity.

Key Features

• Triple-parameter capability: Simultaneous method selection and calibration for COD, NH₃-N, and TP on a single platform—eliminating cross-instrument variability and reducing operational overhead.
• High-stability optical architecture: Equipped with imported long-life (≥100,000 h), high-luminance LEDs and precision narrow-band filters to minimize spectral crosstalk and ambient light interference—ensuring absorbance stability <0.002 A over 20 minutes.
• Bilingual touchscreen interface: 3.5″ color LCD (320×240 resolution) with intuitive Chinese/English menu navigation, real-time parameter display, and on-device data review—reducing training time and operator error.
• User-definable calibration: Supports both factory-loaded standard curves and user-generated calibration functions—enabling method adaptation for matrix-specific corrections or regulatory validation protocols.
• Durable industrial design: Housing fabricated from post-molded ABS with enhanced corrosion resistance—optimized for humid, chemically exposed lab environments.
• Low-power embedded control: 16-bit microcontroller system with optimized firmware for consistent timing, thermal compensation, and error-resilient operation across extended duty cycles.

Sample Compatibility & Compliance

The CHM-301 accepts standard 16 mm round glass or quartz digestion-cuvette tubes (30 supplied), compatible with common EPA, ISO, and GB/T sample preparation workflows. Its measurement ranges meet typical requirements for surface water, effluent, and treated wastewater: COD (5–2000 mg/L, dilutable), NH₃-N (0.02–25 mg/L), and TP (0.00–10 mg/L). The instrument satisfies key performance criteria outlined in ISO/IEC 17025 for testing laboratories—including repeatability ≤3% RSD, accuracy per ISO-defined tolerances, and documented optical drift control. When paired with the DIS-16B (or optional DIS-20B/25B/36B) digestion block—certified to maintain ±0.5 °C temperature uniformity—the full system supports GLP-aligned documentation practices. While not pre-certified to FDA 21 CFR Part 11, audit trails, calibration logs, and user-accessible firmware versioning enable internal validation for GMP-relevant applications.

Software & Data Management

Data acquisition and storage are handled locally via non-volatile memory: up to 1,000 test records—including date/time stamps, sample IDs, measured values, and method identifiers—are retained onboard with timestamped recall. Raw absorbance readings and curve-fit coefficients are accessible for technical review. Export is supported via USB port to CSV-compatible spreadsheets for further statistical analysis or LIMS integration. Firmware updates are performed offline using standard FAT32-formatted USB drives—no cloud dependency or vendor lock-in. All calibration events, digestor temperature profiles, and QC checks generate traceable entries, supporting internal audit readiness and method verification per ISO 17025 Clause 7.7.

Applications

• Environmental monitoring agencies conducting routine compliance testing against national discharge limits (e.g., China’s GB 8978-1996, EU Urban Wastewater Directive).
• Municipal and industrial wastewater treatment plants performing influent/effluent process control and sludge digestion optimization.
• University and government research labs studying nutrient cycling, eutrophication dynamics, or oxidation kinetics in aquatic systems.
• Third-party testing laboratories requiring rapid, cost-effective screening prior to confirmatory ICP-OES or HPLC analysis.
• Educational institutions delivering hands-on training in standard wet-chemistry analytical techniques aligned with APHA Standard Methods (20th/21st ed.).

FAQ

Does the CHM-301 require external PC software for operation?
No—full functionality, including calibration, measurement, data storage, and report generation, is self-contained on the instrument’s embedded system.
Can the CHM-301 be validated for ISO/IEC 17025 accreditation?
Yes—its documented accuracy, repeatability, optical stability, and calibration traceability align with ISO/IEC 17025 Clause 7.2 and 7.7 requirements; users must perform in-house verification per their scope of accreditation.
What digestion protocols does the DIS-16B support out-of-the-box?
Pre-programmed methods include COD (165 °C, 15 min), total phosphorus (120 °C, 30 min), and ammonia distillation-free variants compliant with ISO 7150-1 Annex A.
Is reagent compatibility limited to Shenchanghong-supplied kits?
The CHM-301 accepts any reagent set conforming to the same reaction chemistry and wavelength specifications; however, Shenchanghong kits are pre-validated for accuracy and shelf-life consistency.
How is temperature uniformity verified across the DIS-16B heating block?
Each unit undergoes factory thermal mapping at three load conditions (empty, half-loaded, fully loaded); calibration certificates list max deviation (±0.5 °C) across all 16 positions.