1. Project Background
A large manufacturing company’s wastewater treatment facility needed real-time measurement of oxidation-reduction potential (ORP) in treated wastewater. ORP is a key indicator of disinfection and oxidation processes in biological treatment systems.
Manual sampling methods were labor intensive and lacked continuity, making it difficult to capture dynamic changes during treatment. For this reason, an online sensor solution was required.
2. Field Challenges
Key challenges at the site included:
- Complex industrial wastewater composition
- Requirement for continuous long-term operation
- Need for digital protocol integration into the existing monitoring system
- Installation in submerged, high-protective-rating conditions
3. Solution
The project adopted the KWS-500 online ORP sensor, designed for industrial online ORP monitoring with internal temperature compensation and digital output.
3.1 Sensor Highlights
- Digital sensor with RS-485 output and Modbus protocol for easy integration
- Built-in temperature sensor for automatic compensation
- Industrial-grade electrodes suitable for long-term deployment
- IP68 protection for submerged installation
These features ensured reliable, continuous ORP monitoring in the wastewater environment.
3.2 System Integration
The sensor was connected to the plant’s data acquisition system via RS-485, using the Modbus RTU standard for real-time communication. High and low ORP alarm thresholds were configured to support fast response to potential water quality issues.
4. Results
| Metric | Outcome |
| Continuous Stability | 24/7 reliable operation |
| Data Consistency | Verified against manual sample results |
| Maintenance Requirement | Low, minimal calibration needed |
| System Integration | Smooth connection to monitoring platform |
| Alarm Response | Effective real-time alerts |
After six months of operation, the ORP data trend remained consistent and reliable, providing essential insight for wastewater control and disinfection management.
5. Conclusion
The KWS-500 online ORP sensor proved to be an effective solution for industrial wastewater ORP monitoring.
Its digital RS-485/Modbus interface, automatic temperature compensation, and long-term stable performance allowed seamless integration into plant monitoring systems and significantly improved operational visibility with low maintenance requirements.
For more technical details, wiring diagrams, or model selection guidance, please click here to learn more or contact our technical team.
