EXPEC SUPEC 5000 Automated COD Analyzer

Overview

The EXPEC SUPEC 5000 Automated COD Analyzer is a fully integrated laboratory instrument engineered for precise, high-throughput determination of Chemical Oxygen Demand (COD) in water and wastewater samples. It operates on the principle of rapid digestion followed by spectrophotometric quantification at defined wavelengths (typically 600 nm or 420 nm), in strict compliance with HJ/T 399–2007 — the official Chinese standard for COD measurement using rapid digestion-spectrophotometry. The system implements a closed-loop, robotic sample handling architecture that eliminates manual intervention across all critical steps: sample aspiration, reagent addition, digestion, cooling, mixing, optical measurement, and post-run cleaning. Designed for routine environmental monitoring laboratories, it delivers traceable, auditable, and GLP-compliant data generation under ISO/IEC 17025-aligned workflows.

Key Features

• Fully automated sample processing via programmable robotic arm: coordinates tube handling across dedicated zones — sample loading, digestion, cooling, cap actuation, mixing, and photometric detection.
• Integrated high-precision heating block with PID-controlled temperature uniformity (±1 °C) across the full digestion zone; supports method-defined ramping profiles and dwell times (e.g., 150 °C for 15–30 min).
• Dual-range COD analysis capability (low-range: 0–150 mg/L; high-range: 0–1500 mg/L) enabled by auto-ranging dilution and dual-wavelength absorbance correction, minimizing manual recalibration.
• Onboard reagent preparation module: automates dissolution and dispensing of pre-formulated COD digestion reagents (K₂Cr₂O₇/H₂SO₄/Ag₂SO₄/HgSO₄), reducing analyst exposure and improving inter-batch consistency.
• Direct cuvette-based photometry: uses standard 16-mm glass or quartz digestion tubes as measurement cells — no transfer step required, preserving stoichiometric integrity and reducing contamination risk.
• Intelligent QC integration: automatic insertion of blanks, duplicates, certified reference materials (CRMs), and matrix spikes per user-defined frequency; real-time deviation alerts trigger flagging or pause protocols.
• Emergency sample override function: allows immediate queue insertion without interrupting ongoing runs, maintaining throughput integrity during urgent monitoring events.

Sample Compatibility & Compliance

The SUPEC 5000 accommodates liquid samples with suspended solids ≤ 100 mg/L and chloride concentrations up to 2000 mg/L (with optional mercury-free digestion kits available for chloride-rich matrices). It accepts standard 16-mm OD borosilicate glass digestion tubes (15 mL capacity) and supports both open-tube and capped digestion configurations. All operational parameters — including digestion temperature, time, reagent volume, and calibration curve selection — are stored with full version control and electronic signature support, satisfying documentation requirements under CNAS-CL01 (equivalent to ISO/IEC 17025) and China’s Environmental Monitoring Technical Specifications (HJ 630–2011). Audit trails record every hardware action, user login, method change, and result export event.

Software & Data Management

Controlled via EXPEC LabManager v3.x — a Windows-based platform compliant with FDA 21 CFR Part 11 for electronic records and signatures. The software provides customizable report templates (PDF/Excel), configurable pass/fail criteria per parameter, and built-in uncertainty estimation per ISO/IEC Guide 98-3 (GUM). Raw absorbance data, thermal profiles, and robotic motion logs are archived in encrypted SQLite databases with automatic daily backup. Export modules support LIMS integration via ASTM E1384-compliant HL7 or CSV mapping. All methods are validated per ICH Q2(R2) guidelines for analytical procedure verification.

Applications

The SUPEC 5000 serves core environmental QA/QC functions across municipal wastewater treatment plants, industrial effluent monitoring stations, agricultural runoff assessment programs, aquaculture facility compliance testing, and public health laboratories conducting surface water surveillance. Its throughput — up to 100 samples in 200 minutes — supports daily regulatory reporting under China’s “Environmental Monitoring Network Operation Regulations” (HJ 1207–2021). The modular design (60- or 120-position autosampler variants) scales seamlessly from small research labs to centralized environmental testing centers operating under GB/T 5750.5–2023 (Standard Methods for Drinking Water Quality).

FAQ

Does the SUPEC 5000 comply with international COD standards such as ISO 6060 or APHA 5220D?
It is primarily validated against HJ/T 399–2007; however, its digestion kinetics and spectral methodology are technically aligned with ISO 6060:1989 principles. Method equivalence studies can be conducted per ISO/IEC 17025 clause 7.2.2.
Can the system operate without network connectivity for standalone use in field-deployable labs?
Yes — all control logic, calibration storage, and report generation occur locally; network access is optional for LIMS sync or remote diagnostics.
What maintenance routines are required for long-term reliability?
Scheduled tasks include quarterly optical path verification, biannual digestion block calibration, and monthly robotic arm lubrication — all documented in the embedded maintenance log with due-date reminders.
Is third-party reagent compatibility supported?
Only EXPEC-certified reagent kits are validated for performance and safety; non-certified reagents void warranty and compromise HJ/T 399–2007 conformance.
How is cross-contamination prevented between high-COD and low-COD samples?
The system performs sequential air purge, deionized water rinse, and 10% nitric acid wash between each sample position, verified by blank absorbance stability (RSD < 1.5% over 20 consecutive blanks).