Project Background

Liuyang River is an important river system in Hunan. In tributary or cross-section monitoring projects, the main concern is not only whether water quality meets requirements at a single moment, but how COD, ammonia nitrogen, dissolved oxygen and turbidity change over time.

Rainfall, upstream inflow and local drainage can all affect the monitoring point. A continuous sensor-based system is useful for building a reliable trend record and distinguishing short-term disturbance from real pollution events.

How YexSensor Solves It

For this river section, YexSensor recommends a combined sensor configuration covering COD, ammonium nitrogen, dissolved oxygen, pH, turbidity and conductivity. If the site needs a more integrated device, the YEX-S2-MPS-A multi-parameter sensor can be used to simplify deployment and maintenance.

The sensors can be connected via RS485 Modbus RTU and integrated into the existing monitoring platform. Long-term online data helps the operator evaluate river condition, detect abnormal discharge influence and support environmental management decisions.

Recommended Product Configuration

Product Image	Model / Product Link	Configuration Role
	YEX-S1-COD COD Online Sensor	Tracks organic pollution load changes
	YEX-S1-NHN Ammonium Nitrogen Sensor	Monitors nitrogen pollution trends in tributary and drainage-affected sections
	YEX-S1-RDO Optical Dissolved Oxygen Sensor	Evaluates river ecological condition through dissolved oxygen data
	YEX-S1-PH Industrial Online pH Sensor	Monitors pH variation
	YEX-S1-ZS Online Turbidity Sensor	Observes rainfall runoff, sediment and water disturbance
	YEX-S1-EC Online Conductivity Sensor	Helps identify external discharge or water source changes
	YEX-S2-MPS-A Online Multi-Parameter Self-Cleaning Water Quality Sensor	Provides an integrated option for long-term multi-parameter river monitoring

This configuration is suitable for river cross-sections, tributary monitoring stations and drainage-influenced water bodies.

Related FAQ

For sensor selection, communication and maintenance details, you can also read [Water Quality Sensor Selection FAQ](https://www.yexsensor.com/FAQ/water-quality-sensor-selection-faq.html), [RS485 Modbus Water Quality Sensor Integration FAQ](https://www.yexsensor.com/FAQ/rs485-modbus-water-quality-sensor-integration-faq.html) and [Water Quality Sensor Installation and Maintenance FAQ](https://www.yexsensor.com/FAQ/water-quality-sensor-installation-maintenance-faq.html).