The Conductivity Transmitter & Sensor is a fundamental analytical device used in SCADA‑based water and wastewater treatment systems to measure the electrical conductivity of water—an indicator of dissolved salts and ionic content. Conductivity measurement is essential for monitoring water quality at various stages such as raw water intake, pre‑treatment evaluation, membrane system performance, and final effluent verification. Conductivity transmitters convert the raw sensor signal from a conductivity probe into standardized outputs to be processed by PLCs (Programmable Logic Controllers) or RTUs (Remote Terminal Units) and visualized in the SCADA host system. By providing real‑time, continuous data on conductivity, these instruments enable operators to detect contamination events, optimize chemical dosing, ensure regulatory compliance, and improve overall treatment efficiency.
A typical conductivity transmitter interface pairs with a conductive or inductive conductivity sensor probe mounted in a pipe, bypass loop, or flow cell. The sensor measures the ability of water to conduct electrical current, which varies directly with dissolved ionic concentration. Many modern conductivity transmitters compensate for temperature variability and provide 4–20 mA analog signals, digital protocols (such as Modbus RTU or HART), or pulse outputs compatible with SCADA analog/digital inputs. These communication options enable easy integration with existing automation networks, real‑time dashboards, trend analysis, and alarm logic for automatic control responses.
Conductivity monitoring is especially valuable in water plants that use membrane filtration processes (like reverse osmosis) where conductivity spikes can signify membrane fouling or breakthrough. It also helps optimize coagulation/flocculation dosing, confirm the removal of dissolved solids, and support distribution water quality monitoring. With SCADA integration, conductivity data can trigger automated actions such as adjusting dosing rates, activating bypass valves, or sending alarms when preset thresholds are exceeded. This reduces manual sampling and improves plant responsiveness to changing conditions.
Alfa Laval Conductivity Transmitter Catalog (PDF) https://pdf.directindustry.com/pdf/alfa-laval/alfa-laval-conductivity-transmitter/16602-901414.html