China UV COD Sensor Suppliers & Pricelist

Optical UV sensors rely on the physical principle that unsaturated organic bonds (such as aromatic rings and double bonds) strongly absorb light at 254 nm. Because the majority of organic contaminants in wastewater consist of these molecules, UV absorption (SAC254) directly mirrors Chemical Oxygen Demand. During commissioning, operators perform a 2-point or multi-point calibration against verified lab titration values (ISO 6060 or EPA 410.4) using our controller's onboard algorithm. Once correlated, the optical sensor delivers real-time equivalent readings with correlation coefficients typically exceeding R² = 0.95.

Path length selection depends strictly on the expected organic concentration. As governed by the Beer-Lambert Law, longer paths yield higher sensitivity for clean waters, while shorter paths prevent light extinction in concentrated streams:

• 50 mm path: Clean drinking water, ultra-pure source intake, groundwater (0 – 20 mg/L COD).
• 5 mm path: Secondary municipal treated effluent, cooling tower loops (0.5 – 350 mg/L COD).
• 2 mm path: Standard industrial wastewater, sewage treatment plant aeration basins (1.0 – 1,500 mg/L COD).
• 1 mm or 0.5 mm path: Raw industrial discharge, pharmaceutical or textile wastewater (up to 5,000+ mg/L COD).

BOQU UV COD sensors offer dual-action antifouling options. Our flagship sensors integrate an automated mechanical silicone/PTFE wiper programmed to sweep the optical window before every measurement cycle. Alternatively, for wastewater streams containing abrasive grit or stringy fiber, our probes integrate pressurized air or clean-water flush nozzles that discharge automatically via relay timer, keeping optical channels transparent without manual operator intervention.

Standard sensor assemblies typically ship within 5 to 7 business days from our Shanghai warehouse. For custom OEM or ODM projects—such as laser logo etching, proprietary Modbus register mapping, customized immersion rod lengths, or bespoke titanium alloy wetted parts—lead times range between 3 to 4 weeks. Every instrument undergoes a comprehensive 48-hour burn-in and multi-point optical verification test prior to air freight dispatch.