Shengaohua 6B-12(V9) Smart COD Digestion Analyzer
| Brand | Shengaohua |
|---|---|
| Origin | Jiangsu, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | 6B-12(V9) |
| Digestion Method | Rapid Digestion |
| Heating Module | Single Aluminum Heating Block |
| Batch Capacity | 12 samples |
| Temperature Range | Ambient to 200 °C |
| Temperature Accuracy | ±0.5 °C |
| Digestion Vessel Volume | 17 mL |
| Timer Accuracy | ±0.1 s at 10 min |
| Timer Range | 1–199 min |
| Heating Ramp Time | ≤10 min to setpoint |
| Temperature/Time Setting Resolution | 1 °C / 1 min |
| Power Supply | AC 220 V, 50 Hz |
Overview
The Shengaohua 6B-12(V9) Smart COD Digestion Analyzer is a benchtop, single-block thermal digestion system engineered for precise, reproducible, and compliant sample preparation in accordance with standard methods for chemical oxygen demand (COD), total phosphorus (TP), total nitrogen (TN), total copper, and hexavalent chromium analysis. It operates on the principle of controlled high-temperature acid digestion—typically using potassium dichromate (K₂Cr₂O₇) under strong sulfuric acid conditions—to oxidize organic matter in aqueous samples. The instrument implements a fixed-geometry, closed-tube digestion protocol aligned with ISO 6060, APHA Standard Methods 5220D, and EPA Method 410.4, ensuring consistency across laboratories performing routine wastewater, surface water, and industrial effluent testing.
Key Features
- Single high-thermal-conductivity aluminum heating block with uniform temperature distribution across all 12 positions—engineered to minimize inter-vial thermal variance.
- Intuitive Chinese-language blue-backlit LCD interface with real-time display of setpoint temperature, actual temperature, remaining time, and operational status.
- Four independent programmable timer keys enabling concurrent or staggered start of multiple digestion protocols without manual intervention.
- Six preloaded digestion curves stored in non-volatile memory—including standard COD (165 °C/10 min), TP (120 °C/30 min), and TN (150 °C/45 min) profiles—fully editable and savable for method customization.
- Dual safety architecture: hardware-based overtemperature cutoff (triggered >205 °C) and software-enforced thermal limiter, both independently monitored and logged.
- Corrosion-resistant, flame-retardant polymer housing rated for continuous operation in ambient environments from –5 °C to +45 °C, meeting IP20 enclosure requirements for laboratory use.
- Fast thermal response: reaches 165 °C within ≤10 minutes from ambient, reducing turnaround time per batch without compromising reaction completeness.
Sample Compatibility & Compliance
The 6B-12(V9) accommodates standard 17 mL borosilicate glass digestion tubes with PTFE-lined screw caps, supporting closed-vessel digestion for volatile analytes and minimizing reagent loss. Its temperature stability (±0.5 °C at 165 °C) and timer accuracy (±0.1 s at 10 min) meet the repeatability requirements of ISO/IEC 17025-accredited environmental testing laboratories. While not a data-integrated analytical instrument per se, its operational parameters are traceable and manually recordable to support GLP documentation workflows. It complies with electrical safety standards IEC 61010-1 and EMC directive 2014/30/EU. No embedded data logging or audit trail functionality is provided; users are responsible for external recording of run parameters per internal QA procedures.
Software & Data Management
The 6B-12(V9) features an embedded microcontroller with no external software dependency. All configuration—including temperature setpoints (1–200 °C in 1 °C increments), timer values (1–199 min in 1 min steps), and curve naming—is performed via membrane keypad input and confirmed visually on the LCD. No USB, Ethernet, or Bluetooth connectivity is integrated. As such, it does not support FDA 21 CFR Part 11 electronic signature compliance, automated data export, or remote monitoring. Laboratories requiring digital traceability must implement complementary manual logbooks or integrate the unit into a broader LIMS environment via operator-entered metadata.
Applications
This digester is routinely deployed in municipal wastewater treatment plants for daily COD monitoring prior to discharge; in pharmaceutical manufacturing facilities for cleaning validation wastewater characterization; in pulp and paper mills for effluent TP/TN profiling; and in academic teaching labs for undergraduate environmental chemistry coursework. Its 12-sample capacity supports throughput needs typical of mid-volume QC labs processing 3–5 batches per day. The closed-tube design ensures compatibility with hazardous digestions involving concentrated H₂SO₄ and Ag₂SO₄ catalysts, while the robust thermal envelope prevents condensation-induced corrosion common in open-heating alternatives.
FAQ
What digestion standards does the 6B-12(V9) support?
It is configured to meet APHA 5220D (COD), ISO 6878 (TP), and ISO 11905-1 (TN) thermal protocols when operated with appropriate reagents and tube geometry.
Can the instrument be calibrated or verified by the user?
Yes—users may perform temperature verification using a NIST-traceable PT100 probe inserted into a representative digestion tube; timer accuracy can be validated with a Class A stopwatch.
Is the heating block interchangeable or serviceable?
The aluminum block is permanently mounted and not field-replaceable; however, its surface is resistant to sulfuric acid splatter and designed for long-term thermal cycling stability.
Does the unit include digestion tubes or reagents?
No—17 mL borosilicate digestion tubes, reflux condensers (if required), and analytical-grade reagents must be sourced separately per method specifications.
What maintenance is recommended for long-term reliability?
Monthly visual inspection of the heating surface for residue buildup, quarterly cleaning with dilute nitric acid (≤10%), and annual verification of thermal uniformity across all 12 positions using a multi-point thermometer array.
