Shengaohua SH-804S/806S/808/812 BOD₅ Analyzer – 5-Day Biochemical Oxygen Demand Measurement System

Overview

The Shengaohua SH-804S, SH-806S, SH-808, and SH-812 BOD₅ Analyzers are laboratory-grade instruments engineered for precise, mercury-free determination of 5-day biochemical oxygen demand (BOD₅) in water and wastewater samples. Designed in strict compliance with Chinese national standard HJ 505–2009 (“Determination of Biochemical Oxygen Demand (BOD₅) in Water – Five-Day Dilution and Seeding Method”), these analyzers implement a manometric (pressure-difference) measurement principle. During incubation at 20 °C ±1 °C, microbial degradation of organic matter consumes dissolved oxygen; replenishment occurs via diffusion from the headspace, while CO₂ generated is chemically trapped by potassium hydroxide (KOH) in the sealed culture vial. The resulting pressure differential—proportional to oxygen consumption—is continuously monitored by high-stability imported pressure sensors. This physical correlation enables direct, real-time calculation and display of BOD₅ concentration (mg/L) without manual dilution factor conversion or post-test computation.

Key Features

• Mercury-free manometric detection—eliminates toxic handling risks and aligns with global environmental safety directives (e.g., Minamata Convention)
• Dual-display architecture: 5-inch capacitive touchscreen main interface with intuitive navigation and a dedicated 1.5-inch auxiliary color LCD for at-a-glance status monitoring
• Independent operation per sample vial: each position supports autonomous start/stop, real-time result display, and asynchronous incubation scheduling
• Integrated lithium-ion battery system: enables portable deployment and uninterrupted operation during brief power interruptions; supports simultaneous charging and analysis
• Intelligent data acquisition: continuous pressure sampling, automatic timestamping, and built-in 2-hour logging intervals—no manual intervention required over the full 120-hour incubation period
• Multi-range quantification: 10 programmable segment ranges within 0–4000 mg/L, selectable based on expected sample strength to optimize signal-to-noise ratio and resolution (0.1 mg/L)
• Real-time graphical visualization: auto-generated color trend plots showing pressure decay kinetics, BOD accumulation rate, and endpoint stabilization
• Configurable incubation parameters: adjustable delay start time, total duration, and temperature setpoint verification logs for method validation

Sample Compatibility & Compliance

The SH-series accommodates standard 60 mL BOD bottles with integrated KOH absorbent caps and electromagnetic stir bars. It is validated for use with domestic sewage, industrial effluents (including high-BOD streams from food processing, brewing, dairy, pulp & paper, and pharmaceutical manufacturing), surface water, and treated wastewater. All models support seeding protocols per HJ 505–2009 and ASTM D5210–92 (Standard Test Method for Determining Anaerobic Biodegradation of Organic Compounds). Data integrity meets GLP-aligned requirements: audit-trail-enabled operation logs, user-accessible calibration history, and non-volatile memory retention (10,000 records minimum). While not FDA 21 CFR Part 11-certified out-of-box, the system’s deterministic output, timestamped raw pressure values, and exportable CSV datasets facilitate internal validation for regulated QA/QC environments.

Software & Data Management

Data is stored locally in non-volatile flash memory with cyclic overwrite protection and time-stamped metadata (date/time, vial ID, temperature, pressure delta, calculated BOD). USB export enables seamless transfer to LIMS or Excel-based reporting. Optional wireless module (Wi-Fi 802.11 b/g/n) permits remote dashboard access via browser-based interface—supporting concurrent viewing of live trends, historical comparisons across batches, and export of PNG/PDF reports. Custom parameter fields allow lab-defined annotations (e.g., sample origin, analyst ID, dilution factor) to be embedded in each record. Firmware updates are delivered via secure HTTPS download and verified via SHA-256 checksum prior to installation.

Applications

• Regulatory compliance testing for municipal wastewater treatment plant discharge permits (e.g., under China’s GB 8978–1996 or EU Urban Wastewater Treatment Directive)
• Process control in bioreactor optimization, activated sludge performance evaluation, and nitrification/denitrification monitoring
• Environmental impact assessment (EIA) studies for industrial site development and agricultural runoff characterization
• Academic research in microbial ecology, biodegradability screening of novel surfactants or polymers, and toxicity assessment via BOD inhibition assays
• Quality assurance in beverage, dairy, and fermentation industries where organic load tracking informs pretreatment design and effluent management

FAQ

What standards does this instrument comply with?
It conforms to HJ 505–2009 (China) and is functionally compatible with ASTM D5210–92 and ISO 5815–1:2019 for aerobic biodegradability assessment.
Is calibration traceable to national standards?
Yes—factory calibration uses NIST-traceable pressure references; users may perform two-point verification using certified zero-pressure and known-pressure test points.
Can it measure samples with high suspended solids or toxicity?
Yes, when combined with appropriate dilution, seeding (e.g., acclimated activated sludge), and nitrification inhibition (e.g., allylthiourea) per HJ 505–2009 Section 7.4.
How is data security handled during long-term unattended operation?
All measurements are written to protected memory sectors with write-cycle redundancy; power-loss recovery ensures no data gaps even after unexpected shutdown.
Are replacement consumables available internationally?
Standard BOD bottles, KOH absorbent capsules, and silicone septa are globally sourced components; Shengaohua provides OEM-part numbers for procurement through authorized distributors.