Shengaohua SH-8 Handheld Chemical Oxygen Demand (COD) Analyzer
| Brand | Shengaohua |
|---|---|
| Origin | Jiangsu, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic |
| Model | SH-8 |
| Instrument Type | Laboratory-Grade Portable Analyzer |
| Measurement Principle | Dual-Optical-Path Digital Electrode-Based Optical Absorption (Reagent-Free) |
| Measurement Range | 0.15–300 mg/L COD |
| Accuracy | ≤ ±8% |
| Repeatability | ≤ ±5% |
| Limit of Detection | 0.01 mg/L |
| Measurement Time | 1 minute per sample |
| Batch Capacity | 12 / 16 / 25 / 30 / 35 / 56 samples |
| Display | 3.1-inch amber-tinted LCD |
| Sensor Dimensions | Ø33.7 mm × 176.5 mm (excluding cable) |
| Housing Materials | POM, Nylon, and 316 Stainless Steel |
| Device Dimensions | 200 × 100 × 35 mm |
| Net Weight | 0.3 kg |
| Operating Temperature | 5–45 °C |
| Max Pressure Rating | 1 bar |
| Calibration | Single-point user calibration |
| Power Supply | DC 5 V ±5%, <50 mA |
| Battery | Integrated rechargeable lithium-ion battery |
| Data Storage | Built-in microSD card slot for local data logging and retrieval |
Overview
The Shengaohua SH-8 Handheld Chemical Oxygen Demand (COD) Analyzer is an advanced, reagent-free field-deployable instrument engineered for rapid, on-site quantification of chemical oxygen demand in aqueous matrices. Unlike conventional dichromate-based or spectrophotometric COD methods requiring hazardous reagents, digestion, and laboratory infrastructure, the SH-8 employs a proprietary dual-optical-path digital electrode technology grounded in compensated optical absorption measurement. This principle enables real-time detection of organic oxidation potential by measuring light attenuation across two synchronized optical channels—one reference and one sensing—allowing automatic correction for turbidity, particle scattering, and photometric drift. The result is a stable, interference-resistant signal directly correlated to COD concentration, validated against standard methods (e.g., ISO 6060, ASTM D1252) under controlled inter-laboratory comparison protocols. Designed for operational resilience in variable environmental conditions, the SH-8 meets IP65-rated ingress protection and operates reliably across a 5–45 °C ambient range with no warm-up delay.
Key Features
- Reagent-free operation eliminates consumables, hazardous waste generation, and associated disposal compliance burdens—fully aligned with green analytical chemistry principles (IUPAC Green Analytical Chemistry Guidelines).
- Dual-optical-path digital electrode architecture provides real-time compensation for turbidity, color interference, and optical path degradation—ensuring consistent accuracy across heterogeneous water matrices (e.g., wastewater effluent, surface runoff, aquaculture ponds).
- Integrated rechargeable lithium-ion battery supports >12 hours of continuous field use; USB-C powered charging enables compatibility with portable power banks and solar chargers.
- 3.1-inch amber-tinted LCD display with high-contrast UI optimized for outdoor visibility under direct sunlight; intuitive Chinese/English bilingual menu navigation with tactile button interface.
- On-device data management via microSD card: stores up to 10,000 measurement records with timestamp, GPS-tagged location (when paired with external Bluetooth GNSS module), operator ID, and calibration history.
- Ergonomic handheld form factor (200 × 100 × 35 mm; 0.3 kg) with non-slip textured grip and balanced center-of-mass—designed for extended single-hand operation during multi-point sampling campaigns.
Sample Compatibility & Compliance
The SH-8 is validated for direct immersion or vial-based measurement of raw and treated waters including municipal wastewater, industrial process streams (e.g., petrochemical cooling water, pharmaceutical rinse solutions), aquaculture recirculation systems, drinking water distribution networks, and stormwater runoff. It complies with fundamental performance criteria outlined in ISO 8466-1 (calibration of analytical instruments) and demonstrates traceability to NIST-traceable COD reference standards. While not a replacement for regulatory-grade lab analysis in formal reporting contexts (e.g., EPA Method 410.4 or ISO 6060), the SH-8 satisfies Tier 2 screening requirements per EU Water Framework Directive (WFD) Annex V and serves as a qualified QC tool under GLP-aligned internal quality assurance programs. Its reagent-free design inherently avoids REACH-restricted substances and aligns with ISO 14001 environmental management system objectives.
Software & Data Management
Data export is supported via FAT32-formatted microSD cards, generating CSV files compatible with LIMS integration, Excel-based trend analysis, and GIS mapping platforms. Optional PC software (SH-Link v2.1) provides audit-trail-enabled calibration logging, statistical summary reports (mean, SD, CV%), and batch export with configurable metadata fields. All stored measurements include immutable timestamps, firmware version stamp, and sensor diagnostic flags—supporting basic 21 CFR Part 11 readiness when deployed with organizational electronic signature policies. Firmware updates are delivered via signed binary packages over USB connection, ensuring integrity verification prior to installation.
Applications
- Rapid pre-screening of influent/effluent at WWTPs to prioritize lab submission and optimize treatment process control.
- Field verification of membrane bioreactor (MBR) or moving bed biofilm reactor (MBBR) performance during commissioning and troubleshooting.
- Regulatory surveillance by municipal environmental bureaus conducting routine river and lake monitoring under national surface water quality standards (e.g., China’s GB 3838-2002 Class III–V limits).
- Process water quality checks in semiconductor fabs (photovoltaic wafer cleaning loops) and food & beverage production lines where chloride interference invalidates standard dichromate methods.
- Educational use in university environmental engineering labs for teaching COD concepts without handling Cr(VI) reagents.
FAQ
Does the SH-8 require periodic recalibration with certified standards?
Yes—single-point user calibration using a traceable COD standard (e.g., 50 mg/L potassium hydrogen phthalate solution) is recommended before each daily deployment or after exposure to extreme temperature gradients.
Can the SH-8 measure samples with suspended solids above 100 NTU?
Yes—the dual-optical-path compensation algorithm maintains accuracy up to 400 NTU; however, for samples >200 NTU, optional inline filtration (0.45 µm PES syringe filter) is advised to prevent sensor window fouling.
Is the device suitable for seawater or high-salinity brines?
It has been tested in salinities up to 35 g/L NaCl with no significant drift; however, long-term immersion in marine environments requires post-use rinsing with deionized water to prevent 316SS passivation layer compromise.
What is the warranty coverage and service support structure?
Shengaohua provides 12 months limited warranty covering parts and labor; extended service plans include annual sensor health diagnostics, firmware validation, and metrological re-verification against NIST-traceable references.
How is measurement traceability documented for QA/QC reporting?
Each measurement file includes embedded calibration certificate ID, operator code, and sensor serial number; full audit logs are exportable in PDF format compliant with ISO/IEC 17025 documentation requirements.
