Scenario
In a municipal wastewater treatment plant, PAC (Polyaluminum Chloride) is used for chemical dosing to improve sedimentation and reduce turbidity in treated water. The process demands accurate and responsive control based on real-time water quality parameters.
Configuration
ARMxy Industrial Controller
Y-AI Board – for collecting turbidity and pH signals from online sensors
Y-AO Board – for controlling the dosing pump frequency
Implementation
The Y-AI board reads analog signals (0–20mA) from online turbidity and pH sensors.
The OpenPLC program analyzes turbidity fluctuations and dynamically adjusts the analog output of the AO board (-10 to 10V), which corresponds to a 0–50Hz frequency control of the chemical dosing pump.
The system automatically generates daily dosing reports, which are stored locally and optionally synced to a remote server.
Advantages
The ARMxy controller enables remote storage and historical data access, allowing regulatory bodies to retrieve water quality and dosing logs for compliance checks.
The Y-AO board supports flexible voltage/current output switching, ensuring compatibility with various dosing equipment models.
OpenPLC logic ensures real-time responsiveness and customizable dosing strategies based on site-specific conditions.
Conclusion
This chemical dosing solution, built on ARMxy + OpenPLC, is cost-effective, adaptable, and compliant with environmental monitoring needs. It's a scalable foundation for modernizing process control in wastewater treatment infrastructure.
