Wastewater Discharge Online Monitoring Conductivity Sensor Probe - AMT-DDL300

Wastewater Discharge Online Monitoring Conductivity Sensor Probe

1. Working Principle

Based on the ionic conductivity characteristics of solutions, divided into two categories:

1. Contact electrode type (two-electrode / four-electrode) 
   • Two-electrode: suitable for pure water, low conductivity water bodies; high concentration is prone to polarization and pollution.
   • Four-electrode (mainstream smart type): eliminates polarization effects, anti-pollution, wide range, suitable for sewage, high-salinity seawater, most commonly used in industrial online applications.
2. Electromagnetic induction type (electrodeless): coil induction measurement, suitable for strongly corrosive high-salinity wastewater, cannot measure ultrapure water.

Built-in NTC/PT1000 temperature sensor, automatic temperature compensation, automatic conversion to 25℃ standard conductivity, simultaneously outputs EC, TDS, salinity, temperature multi-parameters.

Wastewater Discharge Online Monitoring Conductivity Sensor Probe

2. Core features

✅ Built-in calculation in probe, no transmitter needed, plug-and-play, reducing system costs ✅ RS485ModbusRTUas the mainstream interface; some also carry 420mA Analog output ✅ Automatic temperature compensation ATC，25℃conversion; factory pre-calibrated, one-key calibration on site ✅ Protection rating mostly IP68, can be installed submerged for long periods ✅ Strong anti-interference, supports long-distance wiring, suitable for IoT and remote monitoring ✅ Power-off saves calibration parameters, parameters will not be lost

Wastewater Discharge Online Monitoring Conductivity Sensor Probe

3. Technical parameters (industrial four-electrode type)

Table

Item	Typical indicators
Measurement range	0~200 mS/cm (can be segmented: pure water μS level, sewage mS level)
Accuracy	±1%~±2%FS
Temperature	0-50℃, automatic temperature compensation
Power supply	DC 924V
Output	RS485 Modbus RTU; optional 4-20mA
Protection	IP68, pressure resistance up to 6-10bar
Material	PEEK electrode sheath, resistant to acid and alkali corrosion

Key selection points:Electrode constant K value：K=0.01 for ultrapure water; K=1 for tap water and surface water; K=10 for sewage and high-salinity wastewater.

Wastewater Discharge Online Monitoring Conductivity Sensor Probe

4. Main application scenarios

• Environmental monitoring: surface water, rivers, reservoirs, seawater, municipal wastewater online monitoring
• Water treatment: pure water / Ultrapure water, circulating water, reclaimed water reuse, water treatment plants
• Industry: chemical, pharmaceutical, power plant boiler water process water quality monitoring
• Aquaculture: seawater aquaculture salinity, aquaculture water bodies EC Monitoring
• Smart agriculture: hydroponic nutrient solution EC Detection