Daruifuno Launches the APX1-C2 Online pH ORP Controller with RS485 Modbus RTU for Water Treatment

Suzhou Delfino Environmental Technology Co., Ltd. (Daruifuno) is proud to announce the release of the APX1-C2 online pH/ORP controller, a compact panel-mount instrument purpose-built for continuous monitoring and control of pH and ORP values of aqueous solutions across water treatment, chemical, and industrial process applications.

The new model combines high-accuracy measurement, flexible connectivity, and rugged construction in a single, easy-to-integrate device, giving engineers a dependable building block for modern water quality control systems.

High-Accuracy pH and ORP Measurement

• Display range: pH 0–14 pH, ORP −2000 mV to 2000 mV, temperature −10 °C to +150 °C
• Resolution: pH 0.01 pH, ORP 1 mV, temperature 0.1 °C
• Accuracy: pH ±0.02 pH and ORP ±2 mV
• Temperature compensation: NTC10K / PT1000, automatic or manual
• Calibration: pH 3-point and ORP 2-point with a quick-calibration menu

Connectivity and Control

The controller integrates easily into SCADA and PLC . Its RS485 interface supports both standard Modbus RTU protocol and JSON text format, and it provides two active 4–20 mA outputs and two SPST relay outputs for direct control of pumps, valves, and alarms.

Built for the Field

A panel-mount enclosure rated IP66 protects the electronics from dust and water, while power-failure protection keeps all parameters retained indefinitely. Applications include municipal and industrial wastewater treatment, pure water systems, chemical processing, electroplating, and aquaculture.

Specifications at a Glance

Wide Range of Applications

Water quality professionals rely on the APX1-C2 across a broad spectrum of duties. In municipal wastewater plants it supports aeration and neutralization control; in industrial settings it serves chemical, petroleum, paper, and electroplating processes; and in aquaculture and swimming pools it safeguards water quality for living systems and public health. Pure water and drinking water facilities also depend on its stable, low-drift measurement for regulatory compliance.

Availability and Support

The APX1-C2 is available now, with full technical documentation, Modbus register maps, and integration support provided by the Daruifuno engineering team. OEM and customized configurations are available on request.

Contact Daruifuno today to request samples, pricing, or the Modbus register documentation for the APX1-C2.