Wastewater Treatment Facilities TDS Monitoring Core Requirements

In industrial wastewater treatment projects, TDS (Total Dissolved Solids) concentration is a key parameter for evaluating treatment effectiveness, protecting membrane components and ensuring discharge compliance. High TDS can lead to reverse osmosis (RO) membrane fouling, equipment scaling and increased energy consumption, directly affecting system operating economics. As a system integrator or engineering contractor, you need to deploy stable and reliable online monitoring equipment at key process nodes to achieve closed-loop control.

YexSensor's YEX-S1-PH online pH sensor and YEX-S1-EC online conductivity/TDS sensor are developed for complex industrial water treatment environments, providing high-precision, multi-protocol compatible monitoring solutions that have been verified in multiple municipal and industrial wastewater projects.

YexSensor Industrial Online Sensor Product Overview

YexSensor series water quality sensors adopt industrial-grade design, balancing measurement accuracy and field reliability. YEX-S1-PH focuses on precise pH value monitoring, while YEX-S1-EC can simultaneously output conductivity (EC) and TDS values, supporting automatic temperature compensation to meet the full range requirements from low-conductivity pure water to high-salinity wastewater.

Both sensors use RS-485 Modbus RTU standard protocol output, facilitating direct connection to mainstream PLC, DCS, SCADA systems and IoT cloud platforms for data acquisition, trend analysis and remote monitoring.

Core Technical Advantages

High Precision and Long-term Stability
YEX-S1-PH adopts a patented reference electrode system, with internal solution slowly seeping through a microporous salt bridge, effectively extending electrode life; YEX-S1-EC is equipped with Pt1000 high-precision temperature compensation element to ensure measurement data consistency at different temperatures.

Strong Anti-interference Capability
Built-in dual high-impedance differential amplifier circuit effectively suppresses common electromagnetic interference in industrial sites, ensuring stable signal transmission over long distances.

Rugged and Durable Protection Design
- Protection rating IP68, supports long-term immersion installation
- Wetted materials optional POM, ABS, SUS316L, etc., suitable for acid-base and high-salt environments
- Working pressure up to 0.6 MPa, covering most process pipeline requirements

Standardized Integration Interface
Uniformly adopts M16-5 core waterproof connector, 3/4 NPT installation thread, simple wiring, reducing on-site construction difficulty.

Product Technical Specifications

YEX-S1-PH Online pH Sensor

YEX-S1-EC Online Conductivity/TDS Sensor

Typical Application Scenarios for System Integrators

Case 1: Chemical Industrial Park Centralized Wastewater Treatment Project
A system integrator deployed YexSensor pH + EC/TDS sensor arrays in the RO unit of an 8000 m³/d wastewater treatment line. Real-time monitoring data from inlet, outlet and concentrate sides were connected to Siemens PLC via Modbus RTU, achieving automatic optimization of recovery rate and membrane fouling warning. After project operation, membrane cleaning cycle was extended by 35%, and annual chemical consumption decreased significantly.

Case 2: Pharmaceutical Factory MBR + RO Advanced Treatment System
The integrator connected the two sensors to the existing SCADA system. The pH sensor ensured RO inlet water in the neutral range, and the EC/TDS sensor precisely controlled the concentration factor. Data was uploaded to the cloud platform via MQTT gateway, supporting mobile monitoring and automatic report generation to meet GMP regulatory requirements.

Case 3: Municipal Sewage Reclaimed Water Plant
The contractor installed a multi-parameter monitoring station before post-disinfection, using YEX-S1-EC TDS output combined with pH data to ensure reclaimed water TDS stable within 300-800 mg/L reuse standard range, achieving linkage control with valves and dosing pumps.

Case 4: Industrial Circulating Cooling Water Treatment
Real-time monitoring of TDS rising trend through sensors, automatically triggering blowdown and water replenishment operations, effectively preventing system scaling and extending equipment service life.

Sensor Selection Guide

System integrators are advised to focus on the following factors during project selection:

• Range Matching: Choose 0-200 μS/cm range for low conductivity applications, recommend 0-5000 μS/cm or higher for high salinity wastewater

• Installation Environment: Prioritize SUS316L material for strong corrosive conditions

• System Compatibility: Confirm upper computer supports Modbus RTU, add RS485 isolator if necessary

• Redundancy Design: Adopt dual sensor hot standby scheme for critical control points

• Maintenance Convenience: Prioritize standard 5-meter cable and reserve calibration operation space

Integration Precautions

• Use shielded cables for signal lines, standardize grounding, avoid parallel laying with strong power cables

• Sensor installation angle not less than 15°, avoid horizontal or inverted installation affecting measurement

• All wiring points must be strictly waterproofed, especially in outdoor or high humidity environments

• It is recommended to install a filter screen in front of the sensor to reduce the impact of suspended solids on the electrode

• Regularly compare with laboratory analysis data and establish calibration maintenance records

• Modbus address and baud rate (default 9600, 8N1) should be uniformly planned before networking

FAQ

Q1: Which mainstream PLC and SCADA systems do YexSensor sensors support?

Q2: How does YEX-S1-EC achieve TDS measurement?

Q3: Can the two sensors form a multi-parameter monitoring system?

Q4: What is the sensor maintenance cycle in high salinity wastewater environments?

Q5: Do the sensors support remote calibration?

Q6: Do cable length and installation interface support customization?

Q7: Can IP68 protection allow long-term immersion in seawater or strong acid environments?

Q8: What is the product warranty and technical support policy?

Summary

YexSensor industrial online pH and EC/TDS sensor series, with standardized Modbus output, high protection design and reliable measurement performance, provides efficient and economical wastewater treatment TDS monitoring solutions for system integrators and engineering companies. Whether for new projects or old system upgrades, they can be quickly integrated and operate stably, helping projects achieve process optimization, cost control and compliance goals.

Welcome engineering teams to contact YexSensor technical support department to obtain detailed selection manuals, project reference cases or on-site test samples, and jointly build smarter and more reliable water treatment monitoring systems.