IoT Surface Water Monitoring Instrument Turbidity Cod Sensor Transmitter

Measures COD using 254nm ultraviolet light absorption without any chemical reagents, producing zero secondary pollution and removing per-test consumable costs from continuous monitoring.

UV absorption method is inherently immune to chloride ion interference that distorts traditional dichromate digestion, delivering greater accuracy in saline or chlorinated wastewater.

RS485 model outputs both COD at 0 to 500 mg/L and turbidity at 0 to 200 NTU, with dual optical path compensation automatically correcting COD readings for turbidity-induced light attenuation errors.

Built-in self-cleaning mechanism actively removes biofouling and impurities from the optical window during operation, with the dynamic sealing component rated for 18 months.

COD readings stabilize within 20 seconds of exposure, enabling near-real-time feedback to wastewater treatment dosing systems and discharge compliance monitoring without data lag.

Optical system uses modulated UV signals with electronic filtering to suppress interference from sunlight and facility lighting, maintaining accurate readings in outdoor and open-tank environments.

Calibration procedure uses potassium hydrogen phthalate standard solutions at 7 concentration points from 10 to 500 mg/L plus zero, providing a multi-segment traceable calibration baseline.

Installation guidance specifies horizontal probe orientation to reduce the chance of debris settling directly on the measurement window, preserving optical path clarity between scheduled cleanings.

Analog output variant combines an IP68-rated submersible electrode with an IP65-rated surface-mounted conversion module, covering both underwater sensing and outdoor panel installation in one system.

Quarterly recalibration is supported via RS485 register commands or direct connection to Renke portable water quality analyzer, enabling field calibration without returning the unit to the factory.