1. Project Background

In Zhangzhou City, Fujian Province, a shrimp farm uses a semi-closed recirculating aquaculture system for farming Pacific white shrimp. Water quality is critical for shrimp health, so the farm needs to monitor electrical conductivity (EC), salinity, and total dissolved solids (TDS) in real-time.

The farm’s water salinity typically ranges from 18–28 ppt, conductivity is about 32–48 mS/cm, and TDS usually ranges from 20000–35000 mg/L. To maintain stable water quality and prevent stress to the shrimp, the farm selected the KWS-300 Digital 4-Electrode Conductivity Sensor for online monitoring.

Digital 4-Electrode Conductivity Sensor for High-Salinity Aquaculture Water Monitoring
Digital 4-Electrode Conductivity Sensor for High-Salinity Aquaculture Water Monitoring

2. Site Conditions & Measurement Requirements

Key requirements for the farm included:

  • High-salinity water measurement, salinity 18–28 ppt
  • Conductivity measurement, 32–48 mS/cm
  • TDS monitoring, 20000–35000 mg/L, to assess total dissolved solids
  • Continuous online monitoring for proactive water management
  • Digital output compatible with farm monitoring system

The KWS-300 enables simultaneous measurement of conductivity, salinity, and TDS, providing a comprehensive view of water quality.

3. Solution Configuration

The monitoring solution included:

  • KWS-300 Digital 4-Electrode Conductivity Sensor, installed in the recirculating water pipeline
  • 4-electrode probe, fully submerged to measure conductivity, salinity, TDS, and temperature
  • RS485 (Modbus RTU) output, integrated with the monitoring system
  • Titanium alloy housing, providing corrosion resistance
  • Automatic temperature compensation, ensuring data accuracy

This configuration ensures stable and reliable operation in high-salinity aquaculture water.

4. Installation & Operation

Installation steps:

  1. Select installation point with stable water flow
  2. Fix the sensor probe and connect 24V DC power and RS485 line
  3. Configure measurement ranges for conductivity, salinity, and TDS
  4. Conduct on-site verification to confirm stable readings

After commissioning, the sensor provided continuous online monitoring, allowing operators to adjust water quality promptly.

5. Application Results & Performance

  • Real-time online monitoring: Replaced periodic manual sampling, providing continuous EC, salinity, and TDS data
  • Stable data: Conductivity 32–48 mS/cm, salinity 18–28 ppt, TDS 20000–35000 mg/L
  • High accuracy: Measurement deviation within ±1%
  • Reduced maintenance: Titanium alloy housing ensured no corrosion over 6 months
  • Improved management: Data allowed timely water adjustments, ensuring shrimp health and growth

6. Project Summary

The KWS-300 Digital 4-Electrode Conductivity Sensor successfully supports high-salinity aquaculture monitoring in Zhangzhou City.
Its simultaneous measurement of conductivity, salinity, and TDS, combined with digital output and robust design, provides reliable, stable, and actionable water quality data for aquaculture operations.

For more technical details, wiring diagrams, or model selection guidance, please click here to learn more or contact our technical team.