The Conductivity/TDS Monitor is an essential process control instrument used in SCADA‑enabled water and wastewater treatment plants to continuously monitor the electrical conductivity and total dissolved solids (TDS) of process water. Conductivity is a measure of the water’s ability to conduct electrical current, which directly correlates with the concentration of dissolved ions (such as salts, minerals, and contaminants). TDS extends this by expressing the total concentration of dissolved substances in the water — a crucial parameter for assessing water quality, desalination efficiency, and contaminant load. Continuous conductivity/TDS monitoring helps operators optimize chemical dosing, evaluate membrane performance (e.g., reverse osmosis), and ensure regulatory compliance regarding effluent discharge and potable water standards.
Conductivity/TDS monitors typically consist of a field‑mounted probe and a transmitter/controller with a clear display and multiple output options. The probe measures ionic concentration in the water, and the transmitter conditions this signal for SCADA integration. Standard output signals include 4–20 mA analog, isolated outputs, and optional digital protocols depending on the model (e.g., Modbus RTU, HART). These outputs allow seamless communication with PLCs, RTUs, and SCADA systems for real‑time visualization, alarm logic, and historical logging of process data. The isolated current loop output ensures minimal electrical noise interference and stable transmission over long cable runs typical in industrial automation environments.
In practice, conductivity/TDS monitors are installed at strategic points in the treatment process, such as raw water intake, post‑treatment verification, membrane feed/effluent lines, and before distribution or discharge. Operators use real‑time data to detect sudden conductivity spikes that may indicate contamination, saltwater intrusion, or bypass events. When integrated with SCADA, conductivity readings appear on dashboards for trend analysis, alarm configuration, and automated process adjustments — for instance, triggering chemical dosing changes or diverting flow during out‑of‑range conditions. Historical data archived by SCADA also supports performance reporting and regulatory compliance audits. (turn0search1 ) Industrial conductivity/TDS monitors are built for durability and reliability, often with rugged housings and protection against harsh environments found in water treatment plants. The instruments are easy to maintain and calibrate, with clear displays and straightforward operational menus. Periodic calibration and electrode cleaning ensure long‑term measurement accuracy, essential for maintaining water quality standards. Real‑time conductivity/TDS monitoring also aids in process optimization, reducing chemical consumption, energy use in membrane systems, and operational downtime.
CCT‑3320T Conductivity (TDS) Monitor Manual & Datasheet (PDF) https://water.co.id/en/products/instruments