The pH/ORP Transmitter is a critical water quality monitoring instrument widely used in SCADA-enabled water and wastewater treatment plants. It measures the acidity or alkalinity (pH) of water as well as oxidation-reduction potential (ORP), providing vital information about chemical reactions, disinfection efficiency, and process optimization. Accurate pH and ORP measurements are essential for chemical dosing control, corrosion prevention, effluent quality compliance, and treatment plant efficiency. These transmitters integrate directly into SCADA systems via PLCs or RTUs, delivering real-time data to operator dashboards, alarm systems, and historical databases for monitoring, reporting, and automated process control.
The transmitter works with pH electrodes and ORP sensors immersed in the process water. The sensors generate small electrical signals corresponding to pH or ORP values, which are processed and amplified by the transmitter. Modern devices provide temperature compensation and can output signals in 4–20 mA analog, HART, Modbus RTU, or digital Ethernet protocols, enabling seamless integration with SCADA software for real-time monitoring and automated control.
pH and ORP transmitters are used across all stages of water treatment, including raw water intake, chemical dosing systems, neutralization tanks, disinfection systems, and effluent monitoring. Continuous measurement allows SCADA systems to adjust acid/base dosing pumps, chlorine or ozone disinfection systems, and coagulant addition, ensuring optimal process efficiency and regulatory compliance. In addition, historical trending enables operators to detect process deviations, sensor drift, or water quality changes before they affect treatment outcomes. (Endress+Hauser ) Industrial pH/ORP transmitters are designed for harsh conditions. They feature IP65/IP67 or higher enclosures, corrosion-resistant materials, and robust sensor connections suitable for long-term immersion in water, wastewater, or chemical solutions. Many models include automatic calibration, diagnostics, and cleaning functions to maintain accuracy and reduce maintenance. Integration with SCADA allows operators to visualize trends, configure alarms, automate control, and generate compliance reports, improving water treatment efficiency and operational reliability.
Endress+Hauser CPS11 pH/ORP Transmitter Datasheet (PDF) https://www.endress.com/en/field-instruments-overview/liquid-analysis-product-overview/pH-analog-sensor-CPS11?t.tabId=product-overview