Simplifying Field Data Acquisition from Water Quality Sensors to SCADA and Cloud Platforms

Industrial wastewater treatment plants rely on continuous monitoring of water quality parameters to maintain stable operation, improve treatment efficiency, and support environmental compliance.

For wastewater treatment system integrators, one of the challenges is creating a reliable connection between field instruments and higher-level automation systems. Modern projects increasingly require not only local control but also transparent data access for SCADA, databases, MES systems, and cloud-based monitoring platforms.

A typical industrial wastewater automation architecture can be structured as:

Field Devices → Sensors / Instruments → Remote IO → Industrial Ethernet → SCADA Server → Database → Cloud Platform / MES / Customer Dashboard

Within this architecture, Remote IO plays an important role by collecting distributed field signals and providing standardized data communication to upper-level systems.

 BL191 EdgeIO: Connecting Wastewater Field Data with OPC UA

The EdgeIO BL191 OPC UA Controller is designed to provide a flexible data acquisition solution for industrial applications where field-level signals need to be integrated with modern automation and digital platforms.

Unlike traditional architectures that require separate PLC expansion modules and additional protocol gateways, BL191 combines data acquisition, edge processing, and OPC UA communication in one compact controller.

BL191 supports the OPC UA standard and provides a unified interface for connecting OT devices with SCADA, MES, MOM, ERP, and cloud platforms. It can work as a remote I/O expansion device for PLC systems or operate independently for data acquisition and logic processing applications.

Application Example: Raw Water Quality Monitoring in Wastewater Treatment Plants

At the raw water inlet section of an industrial wastewater treatment facility, online sensors continuously monitor incoming wastewater conditions before different treatment processes begin.

These measurements help operators understand influent characteristics and optimize subsequent treatment processes.

A typical monitoring point list includes:

BL191 can collect signals from field instruments through analog input modules. The AI modules support common industrial signals such as 0–20mA, 4–20mA, 0–5V and 0–10V, with internal signal conversion to engineering values, simplifying integration with different types of sensors.

For wastewater instruments using Modbus RTU communication, BL191 can also connect through its RS485 interface and convert field data into OPC UA information for upper-layer systems.

From Water Quality Sensors to Digital Platforms

With BL191 integrated into a wastewater automation system, the data flow becomes:

Water Quality Sensors→BL191 EdgeIO(Data Acquisition + Edge Processing)→OPC UA Communication→SCADA Server→Database→Cloud Platform / MES / Customer Dashboard

Through OPC UA communication, system integrators can provide customers with:

• Real-time water quality visualization
• Historical data recording
• Alarm monitoring
• Remote operation support
• Data integration with digital platforms

BL191 supports OPC UA client connections from systems such as SCADA, MES, MOM, ERP, WMS, and cloud platforms, helping bridge the gap between field devices and enterprise-level applications.

Flexible I/O Expansion for Different Wastewater Applications

Industrial wastewater projects often involve various types of field signals, including:

• Analog water quality sensors
• Pump status signals
• Valve feedback
• Temperature monitoring
• Flow meters
• RS485-based instruments

The BL191 EdgeIO controller supports 1–3 I/O expansion slots, allowing integrators to select different modules according to project requirements, including analog input, digital I/O, temperature input, and serial communication modules.

This modular approach allows system integrators to design solutions according to different wastewater treatment processes without unnecessary hardware complexity.

As wastewater treatment plants continue moving toward digitalization, collecting reliable field data is becoming increasingly important.

For system integrators, the challenge is not only connecting sensors and instruments, but also ensuring that valuable process data can be accessed by SCADA systems, databases, MES platforms, and cloud applications.

With OPC UA communication, flexible I/O expansion, and industrial-grade design, EdgeIO BL191 provides a practical way to connect wastewater field instrumentation with modern automation architectures.

EdgeIO BL191 — Connecting wastewater field data with industrial digital systems.