Shengaohua SH-16A Intelligent COD Digestion Block (16-Position)

Overview

The Shengaohua SH-16A Intelligent COD Digestion Block is a precision-engineered thermal digestion system designed for standardized chemical oxygen demand (COD) analysis in accordance with ISO 6060, EPA Method 410.4, and HJ 828–2017 (Chinese Environmental Protection Standard). It implements rapid, closed-vessel wet digestion using potassium dichromate under strongly acidic conditions at elevated temperatures—typically 150–165 °C for 2 hours or 165 °C for 10–30 minutes depending on sample matrix and regulatory protocol. The instrument employs a single, high-thermal-conductivity aluminum heating block with embedded Pt100 temperature sensors and adaptive PID control to ensure uniform thermal distribution across all 16 positions. Its air-convection-optimized internal architecture minimizes thermal gradient deviation (<±0.3 °C inter-position variation), critical for inter-laboratory reproducibility and method validation compliance.

Key Features

• 5-inch IPS high-resolution capacitive touch display with intuitive graphical interface and multilingual menu navigation (English preconfigured)
• Built-in 7 pre-programmed digestion temperature/time profiles aligned with common regulatory methods (e.g., ISO 6060, HJ 828–2017, APHA 5220D)
• 11 user-definable temperature ramping and holding profiles, supporting multi-step protocols including pre-heating, digestion, and cooling phases
• Adjustable temperature range from ambient to 185 °C in 0.1 °C increments; timer range: 0–999 minutes with ±0.1 s resolution
• Dual heating modes: continuous (for batch consistency) and discontinuous (energy-saving mode with duty-cycle modulation)
• Intelligent power modulation: heating output dynamically scales with active sample count to maintain setpoint stability and reduce energy waste
• Imported high-stability heating elements with thermal runaway protection and automatic cut-off after timeout or overheating
• Magnetic latching lid with optical feedback (breathing LED) and real-time temperature overlay on display for operational transparency
• Integrated surge suppression and overvoltage protection circuitry compliant with IEC 61000-4-5 Level 3 immunity requirements
• Ergonomic, one-piece molded PP housing with optimized airflow channels and corrosion-resistant internal baffle design to divert acidic vapors away from electronics

Sample Compatibility & Compliance

The SH-16A accommodates standard 16 mm outer-diameter COD digestion tubes (e.g., Hach, Lovibond, or generic borosilicate glass or quartz variants). Its thermal uniformity and precise dwell-time control meet the repeatability requirements of ISO/IEC 17025-accredited laboratories performing routine wastewater, surface water, and industrial effluent testing. The system supports GLP documentation workflows via timestamped parameter logging (temperature, time, profile ID) and is compatible with external LIMS integration through RS232 serial output (optional TTL-to-USB adapter). While not FDA 21 CFR Part 11 certified out-of-the-box, audit trails can be exported in CSV format for manual review and archiving in validated environments.

Software & Data Management

No proprietary software installation is required. All configuration, execution, and status monitoring occur locally via the onboard touchscreen interface. Each digestion run logs: start time, selected profile ID, setpoint temperature, actual average block temperature (recorded every 5 seconds), elapsed time, and completion status. Logs are retained internally for up to 500 cycles and exportable via micro-USB to PC for QA/QC trending, calibration verification, and internal audit preparation. The system supports manual annotation of sample IDs per run (alphanumeric entry) and allows profile cloning/editing without firmware update.

Applications

This digestion block serves as a core preparatory tool in environmental quality control labs conducting COD analysis on diverse matrices—including municipal sewage, landfill leachate, textile dye baths, electroplating rinse waters, pharmaceutical process effluents, food processing wastewater, and aquaculture discharge. Its 16-position capacity enables parallel processing for throughput-critical applications such as daily plant monitoring, regulatory reporting (e.g., China’s “Blue Sky & Clear Water” initiative), and third-party certification testing. The wide temperature range also permits adaptation to alternative oxidation protocols—for example, total phosphorus (TP) or total nitrogen (TN) persulfate digestion at 120–150 °C—when paired with appropriate reagent kits and tube compatibility verification.

FAQ

What standards does the SH-16A support for COD digestion?
It complies with HJ 828–2017 (China), ISO 6060, and EPA Method 410.4 when operated within specified temperature/time windows and using calibrated reference materials.
Can the SH-16A be used for parameters other than COD?
Yes—its programmable temperature and timing make it suitable for TP, TN, and other acid-digestible analytes, provided vessel compatibility and method validation are confirmed per laboratory SOP.
Is remote monitoring or network connectivity available?
No built-in Ethernet or Wi-Fi; however, RS232 serial output enables connection to SCADA systems or custom data acquisition platforms with appropriate interface hardware.
What maintenance is required for long-term accuracy?
Annual verification of temperature uniformity (using NIST-traceable probe array) and timer calibration is recommended. No consumables or routine part replacement is needed beyond standard cleaning of the heating block surface.
Does the unit include digestion tubes or reagents?
No—tubes and chemical reagents must be sourced separately per analytical method requirements. Compatibility with 16 mm OD borosilicate glass or quartz digestion vials is confirmed.