Shenchanghong TCNPN-401D Multi-Parameter Water Quality Analyzer for COD, Ammonia-N, Total Phosphorus and Total Nitrogen
| Brand | Shenchanghong |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Type | Laboratory Benchtop Analyzer |
| Model | TCNPN-401D |
| Detection Principle | Rapid Digestion Spectrophotometry (Hach-style closed-tube digestion followed by absorbance measurement) |
| Wavelength Range | 420 nm (COD), 610 nm (Ammonia-N), 700 nm (Total Phosphorus), 220/275 nm (Total Nitrogen via UV-VIS dual-wavelength correction) |
| Measurement Ranges | COD: 5–2000 mg/L (extendable to 20,000 mg/L) |
| Ammonia-N | 0.02–25 mg/L |
| Total Phosphorus | 0.00–10 mg/L |
| Total Nitrogen | 0.05–100 mg/L |
| Accuracy | ≤ ±5% (COD, TP, TN), ≤ ±3% (NH₃-N) |
| Repeatability | ≤ 3% RSD |
| Detection Limit | 0.1 mg/L (COD), 0.01 mg/L (NH₃-N), 0.005 mg/L (TP), 0.02 mg/L (TN) |
| Digestion Time | 15 min (COD), 30 min (TP/TN), variable (NH₃-N) |
| Batch Capacity | 16 samples (expandable to 20/25/36 with optional DIS-20B/DIS-25B/DIS-36B digester) |
| Optical Stability | ≤ 0.002 A/20 min |
| Temperature Control Range | Ambient to 200 °C |
| Temperature Accuracy | ≤ ±1.0 °C |
| Chloride Interference Tolerance | ≤ 2000 mg/L (COD module with masking agent) |
| Data Storage | 100,000 records (including timestamp, operator ID, parameter, concentration, unit, calibration history) |
| Interface | USB 2.0, thermal printer port |
| Display | 7-inch color capacitive touchscreen, bilingual (English/Chinese) UI |
Overview
The Shenchanghong TCNPN-401D is a laboratory-grade multi-parameter water quality analyzer engineered for simultaneous, standardized quantification of Chemical Oxygen Demand (COD), Ammonia-Nitrogen (NH₃-N), Total Phosphorus (TP), and Total Nitrogen (TN) in municipal, industrial, and environmental wastewater matrices. It implements rapid digestion spectrophotometry — a method compliant with ISO 6060 (COD), ISO 7150-1 (NH₃-N), ISO 6878 (TP), and ISO 11905-1 (TN) — where sample digestion is performed externally in a thermally controlled block digester (DIS-series), followed by photometric analysis using narrow-band interference filters and cold LED light sources. This physical separation of digestion and optical measurement eliminates thermal drift and ensures long-term photometric stability, critical for regulatory compliance and inter-laboratory reproducibility. The system supports both pre-programmed and user-defined calibration curves, enabling traceable, auditable measurements aligned with GLP and ISO/IEC 17025 laboratory quality management requirements.
Key Features
- Modular architecture: Independent digestion unit (DIS-16B standard; optional DIS-20B/25B/36B) decouples thermal stress from the optical path, preserving baseline stability and extending lamp lifetime.
- Cold LED optical system with 16-step adjustable intensity control: Enables dynamic signal optimization across wide concentration ranges without hardware recalibration — essential for high-dynamic-range applications such as raw sewage and treated effluent.
- Bilingual 7-inch capacitive touchscreen interface: Intuitive icon-driven navigation with embedded operational guidance, real-time status feedback, and contextual help for each analytical step.
- Comprehensive calibration traceability: Stores full calibration metadata — including standard reference values, measured absorbances, calibration date/time, and operator ID — allowing full reconstruction of calibration conditions per ISO/IEC 17025 Clause 7.7.
- One-click curve recovery: Restores factory-default and user-saved calibration curves from non-volatile memory upon accidental deletion or firmware reset.
- Multi-point temperature calibration for digester: Compensates for sensor nonlinearity across the full 30–200 °C range, delivering zero-error temperature setpoint accuracy per ASTM D1252 and EPA Method 410.4 specifications.
- Dual thermal protection: Automatic power cutoff at >200 °C plus programmable auto-shutdown post-digestion enhances personnel safety and prevents tube over-pressurization.
- Extensive curve library: Supports up to 250 factory-loaded and 3500 user-defined calibration equations — compatible with Hach, Merck, and custom reagent chemistries.
- Robust data governance: 100,000-entry internal database logs parameter name, numeric result, unit, timestamp, operator code, digestion batch ID, and curve version — exportable via USB for LIMS integration.
Sample Compatibility & Compliance
The TCNPN-401D accepts standard 16 mm OD glass or quartz digestion tubes (145 mm length) and 16 mm OD cuvettes (110 mm length), accommodating liquid samples with suspended solids ≤ 50 mg/L (pre-filtered per ISO 5667-3). It complies with key international standards: ISO 6060 (COD), ISO 7150-1 (NH₃-N), ISO 6878 (TP), and ISO 11905-1 (TN); and aligns with U.S. EPA Methods 410.4 (COD), 350.1 (NH₃-N), 365.4 (TP), and 353.2 (TN). Its chloride tolerance (≤2000 mg/L for COD) meets ASTM D1252-B requirements when used with mercury-free masking reagents. All firmware and data handling protocols support audit-trail generation required under FDA 21 CFR Part 11 for regulated environmental testing laboratories.
Software & Data Management
Instrument firmware includes embedded data management tools supporting time-stamped record review, statistical summary (mean, SD, CV%), and customizable report templates. USB export generates CSV files compatible with Microsoft Excel, LabWare LIMS, and LimnoTech WQX. Optional PC software (supplied on included CD) enables remote instrument configuration, batch calibration upload/download, and GLP-compliant electronic signature capture. All stored measurements include immutable metadata fields (e.g., “Calibration Curve v2.3_20240517_OP112”), satisfying traceability requirements of ISO/IEC 17025:2017 Clause 7.7.2 and EU Water Framework Directive QA/QC protocols.
Applications
The TCNPN-401D is routinely deployed in municipal wastewater treatment plants (WWTPs) for daily process control of influent, activated sludge, and final effluent; in industrial pretreatment labs for compliance monitoring of textile, food processing, and pharmaceutical discharges; and in environmental testing service laboratories accredited to ISO/IEC 17025. Its extended COD range (up to 20,000 mg/L) supports landfill leachate and anaerobic digester supernatant analysis, while low-level NH₃-N detection (0.02 mg/L) enables sensitive monitoring of nitrification/denitrification efficiency. Dual-wavelength TN measurement mitigates organic interference common in surface water and groundwater screening.
FAQ
Does the TCNPN-401D require external PC software for routine operation?
No — all core functions (digestion control, measurement, calibration, reporting) are fully operable via the onboard touchscreen. PC software is optional and used only for advanced data aggregation, LIMS synchronization, or bulk calibration management.
Can the instrument validate calibration curves against certified reference materials (CRMs)?
Yes — the system allows manual entry of CRM lot numbers and target values during calibration verification, and stores deviation reports with pass/fail flags per ISO/IEC 17025 Clause 7.7.3.
Is the digester compatible with EPA-approved digestion vials?
Yes — the DIS-series block accommodates standard 16×145 mm borosilicate glass vials meeting ASTM D1252 and EPA Method 410.4 dimensional and thermal specifications.
How is data integrity ensured during power interruption?
All measurements and calibration events are written to non-volatile flash memory immediately upon completion; no data loss occurs during unexpected shutdown.
What maintenance is required for optical stability?
The cold LED source requires no replacement for ≥50,000 hours; periodic cleaning of the cuvette chamber and optical window with lint-free ethanol swabs is recommended every 200 measurements.
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