Shenchanghong CY-2A Intelligent BOD Analyzer
| Brand | Shenchanghong |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic |
| Model | CY-2A Intelligent BOD Analyzer / Rapid BOD Analyzer |
| Instrument Type | Laboratory BOD Analyzer |
| Measurement Principle | Manometric (Pressure-Difference) Method |
| Measurement Range | 0–4000 mg/L |
| Detection Limit | 5 mg/L |
| Accuracy | As specified in technical documentation |
| Single-Sample Analysis Time | 1–30 days |
| Repeatability | ±3% RSD |
Overview
The Shenchanghong CY-2A Intelligent BOD Analyzer is a laboratory-grade biochemical oxygen demand (BOD) measurement system engineered for precision, reliability, and compliance with standard environmental testing protocols. It operates on the manometric (pressure-difference) principle—measuring the consumption of dissolved oxygen by microorganisms during the aerobic biodegradation of organic matter in water samples under controlled incubation conditions (typically at 20 °C for 5 days, per ISO 5815-1:2019 and ASTM D5210). Unlike dilution-based or titrimetric methods, the CY-2A employs sealed, temperature-stabilized BOD bottles equipped with pressure transducers to continuously monitor headspace pressure changes resulting from CO₂ absorption in an alkaline scrubber. This eliminates manual intervention, minimizes operator error, and enables unattended long-term monitoring across multiple samples simultaneously.
Key Features
- Integrated manometric sensing architecture with high-stability pressure transducers calibrated for low-range differential pressure detection (±0.1 kPa resolution)
- Programmable incubation duration from 1 to 30 days—supporting standard 5-day BOD5, extended BODu, and kinetic profiling applications
- Dual-channel CO₂ absorption system using sodium hydroxide pellets to ensure quantitative conversion of microbial respiration into measurable pressure drop
- Microprocessor-controlled temperature regulation (±0.2 °C) within the insulated incubation chamber, compliant with ISO/IEC 17025 environmental conditioning requirements
- Real-time digital display of BOD concentration (mg/L), elapsed time, and pressure drift diagnostics
- Robust mechanical design with corrosion-resistant housing and sealed electronics—rated IP54 for laboratory benchtop operation
- Onboard data logging (up to 1,000 sample records) with timestamped entries and automatic calculation of BOD values using standardized stoichiometric conversion algorithms
Sample Compatibility & Compliance
The CY-2A accommodates standard 60 mL or 250 mL BOD bottles (glass or disposable polyethylene), supporting raw wastewater, treated effluent, surface water, groundwater, and industrial process streams. Sample pretreatment—including pH adjustment (6.5–7.5), nutrient supplementation (phosphate buffer, MgSO₄, CaCl₂, FeCl₃), and nitrification inhibition (allylthiourea, if required)—follows EPA Method 405.1 and ISO 5815-1 guidelines. The instrument meets essential performance criteria for routine environmental laboratories operating under GLP frameworks and supports audit-ready data output for regulatory submissions to local environmental protection agencies. While not certified to FDA 21 CFR Part 11 out-of-the-box, its data export functionality (CSV via USB) facilitates integration into validated LIMS environments requiring electronic record integrity.
Software & Data Management
The CY-2A operates as a standalone analyzer with embedded firmware; no external PC is required for basic operation. Optional Windows-compatible desktop software (SC-Hub v2.3, sold separately) enables advanced functions: multi-instrument synchronization, statistical batch reporting (mean, SD, CV%), calibration curve management, and PDF report generation with configurable headers (lab ID, analyst name, QA/QC flags). All measurement data include embedded metadata—sample ID, start/end timestamps, incubation temperature logs, and pressure baseline validation status—to support traceability in ISO/IEC 17025-accredited facilities. Audit trails are maintained locally and exportable for internal quality reviews.
Applications
- Regulatory compliance monitoring of municipal and industrial wastewater discharge permits (e.g., China’s GB 3838–2002, EU Urban Wastewater Treatment Directive)
- Performance evaluation of biological treatment units (activated sludge, MBR, trickling filters)
- Environmental impact assessment (EIA) studies for surface water bodies receiving point-source discharges
- Research on biodegradability kinetics of emerging contaminants (pharmaceuticals, surfactants, microplastics leachates)
- Educational use in university environmental engineering and analytical chemistry laboratories
FAQ
What is the minimum detectable BOD concentration using the CY-2A?
The stated detection limit is 5 mg/L, determined under standard 5-day incubation with 60 mL sample volume and optimal microbial seeding (e.g., domestic sewage inoculum per ISO 5815-1 Annex A).
Can the CY-2A measure BOD beyond 5 days?
Yes—the instrument supports programmable incubation periods from 1 to 30 days, enabling determination of ultimate BOD (BODu) and biodegradation rate modeling.
Is temperature control integrated into the unit?
Yes—the CY-2A includes a thermostatically regulated incubation chamber with PID-controlled heating and insulated enclosure, maintaining 20.0 ± 0.2 °C throughout the test period.
Does the system require daily manual reading or adjustment?
No—once samples are loaded and parameters set, the analyzer runs autonomously, recording pressure data at user-defined intervals (default: every 2 hours) and calculating final BOD values upon completion.
How is CO₂ interference managed during measurement?
An alkaline scrubber (NaOH pellets) inside each BOD bottle quantitatively absorbs CO₂ produced during respiration, ensuring that only O₂ depletion contributes to the measured pressure differential.
