Total Dissolved Solids controller The TDS 602 - 1 series of TDS Controller and Transmitter provides a reliable method of Monitoring, Controlling & Transmitting 4 - 20mA / RS 485 MODBUS RTU Communication for Interfacing to PLC & Data logger. This product is suitable to measure TDS in water treatment, Electrolytic water cleaning, Chemical Industries, Food Process, Waste Water treatment, Textile Industries & Neutralization process, etc., . This TDS Controller & Transmitter can Measured using Industrial TDS Sensors, Temperature can be measured using temperature sensor. This TDS Controller & Transmitter has many User Friendly and Safety Features Which as Follows.