Nexisense MW-TDS101 TDS Water Quality Online Monitoring Sensor: Industrial-Grade Total Dissolved Solids Detection Integrated Solution

In engineering projects such as pharmaceutical water for injection/electronic-grade ultrapure water production, automatic control of circulating cooling water concentration ratio, industrial wastewater total outlet compliant discharge monitoring, boiler makeup water quality stabilization, semiconductor/photovoltaic pure water preparation, TDS (Total Dissolved Solids) serves as a comprehensive indicator characterizing water mineralization, purity, and concentration level. Its continuous, reliable, and online measurement has become a rigid requirement for process closed-loop control, reagent dosing optimization, discharge supervision, direct data transmission to environmental platforms, and project completion acceptance. Traditional laboratory oven-drying gravimetric methods or intermittent analyzers can no longer meet 24/7 unattended, high-reliability, fast-response, and real-time interlocking requirements with PLC/SCADA.

Nexisense MW-TDS101 TDS water quality sensor is based on high-precision conductivity measurement principle, directly outputs conductivity signal linearly related to TDS concentration through two-electrode/four-electrode structure, range 0~2000 ppm, accuracy ±5% F.S., fast response, compact size, easy installation, suitable for various industrial water bodies such as high-purity water, circulating water, wastewater. The product comes standard with analog voltage/current output, optional RS485 Modbus RTU interface, industrial-grade protection design (IP68 optional), wide temperature operation, meeting engineering-level requirements such as pharmaceutical/semiconductor cleanroom, explosion-proof in hazardous chemical parks, EMC Level IV. It has passed third-party metrological type approval and EMC testing.

Typical Industrial Project-Level Application Scenarios

1. Pharmaceutical/Biopharmaceutical Water for Injection and Purified Water TDS Process Monitoring
   MW-TDS101 is deployed at EDI, reverse osmosis, polishing mixed bed backend and storage tank return lines, combined with pH, conductivity, TOC sensors to form multi-parameter nodes, 4-20mA signal connects to MES/PLC system, achieving automatic tank switch or regeneration logic when TDS > set value (typical<10 ppm), ensuring water for injection/purified water meets USP/EP/JP standard online monitoring and batch traceability.

2. Large Thermal Power/Petrochemical/Steel Circulating Cooling Water Concentration Ratio Automatic Control
   TDS directly reflects circulating water concentration level and blowdown timing. MW-TDS101 is installed at cooling tower sump or makeup water line, output connects to PLC, achieving automatic blowdown valve opening or reduced makeup rate when TDS > set value (typical 1500~2000 ppm), effectively controlling scaling/corrosion risks and reducing corrosion/scale inhibitor consumption.

3. Semiconductor/Photovoltaic/Electronic-Grade Ultrapure Water Preparation TDS Online Assessment
   Electronic-grade ultrapure water requires extremely low TDS (<1 ppm). MW-TDS101 high-precision version is deployed at polishing mixed bed backend or point of use, linked with particle, TOC sensors, data connects to cleanroom SCADA/MES, ensuring automatic alarm and system shutdown protection for TDS anomalies, meeting ASTM D1193 Type I/II standards.

4. Industrial Park Wastewater Total Outlet Compliant Discharge Monitoring
   Park wastewater total outlets require real-time TDS monitoring as salinity/mineralization indicator. MW-TDS101 is integrated into multi-parameter online analyzers, networked with COD, ammonia nitrogen, pH, supporting NB-IoT/4G direct transmission to environmental platforms, achieving automatic tracing of TDS anomalies and exceedance warnings.

5. Boiler Makeup Water and Demineralized Water System TDS Stabilization Control
   High TDS in boiler makeup water easily causes boiler scaling and corrosion. MW-TDS101 is deployed at demineralized water outlet or makeup line, linked with conductivity sensor, automatically starting regeneration or switching to backup demineralization system when TDS > set value, ensuring stable boiler feedwater quality.

MW-TDS101 TDS Sensor Selection and Engineering Integration Guide

Key Selection Parameters (For Engineering Procurement)

System Integration and On-Site Deployment Considerations

• Pre-treatment: TDS is susceptible to suspended solids, oil interference. Recommended to configure pre-filter unit (pore size 10~50 μm) or bypass filtration circulation to avoid electrode contamination.

• Installation Method: Flow-through cell type (recommended DN50~DN80 pipeline bypass), immersion type (with protective cage), lance type (portable inspection). Flow-through cell requires flow velocity 0.1~0.3 m/s to avoid bubble retention.

• Electrical & Communication: Analog output recommended with independent shielded cable, away from strong power cables; RS485 bus uses shielded twisted pair + terminating resistor (120Ω), each segment ≤1200 m.

• Host System Docking: Analog output directly connects to PLC analog input module; Modbus RTU polling cycle recommended 1~5 s, supports direct communication with Siemens S7/TIA Portal, Schneider EcoStruxure, Honeywell Experion, KingView/Kunlun Tongtai, etc.; for cloud platforms, add Modbus to MQTT/OPC UA gateway.

• Redundancy & Reliability: Critical monitoring points recommend 1+1 redundant probes + dual-channel acquisition module, automatic probe failure switchover with maintenance alarm.

• On-Site Calibration: Factory provides ISO 17025 traceable calibration certificate, on-site recommended two-point calibration using standard solutions (1413 μS/cm, 12.88 mS/cm).

• EMC & Lightning Protection: Product passed IEC 61000-6-2/4 industrial-grade EMC test, recommended to install power surge protector and signal surge protector on site.

Nexisense OEM/Customization and Bulk Supply Advantages

• Probe Structure Customization: Supports special electrode materials (high temperature/HF resistant), extended lance (1~5 m), array multi-point layout, special range (0~500 ppm high-precision version).

• Communication & Edge Processing Customization: In addition to standard analog output + Modbus RTU, supports OPC UA Server, MQTT TLS, LoRa private protocol, NB-IoT/4G transparent transmission, customizable edge gateway firmware (local TDS trend judgment, over-limit linkage blowdown logic, breakpoint resume).

• Bulk Delivery Capability: Monthly capacity over 150,000 units, core electrodes and circuit boards produced in-house, standard lead time 4~6 weeks, urgent orders compressible to 3 weeks.

• Quality & Certification: Full process ISO 9001 + ISO 14001 management, products passed CE, RoHS, third-party EMC, explosion-proof (some models Ex ia), metrological type approval certificate.

• Engineering Implementation Support: Provides Modbus register mapping table, CAD installation drawings, EMC/lightning protection design guidance, on-site joint commissioning, engineer training, and long-term spare parts inventory commitment.

Real Project Application Cases

1. East China Large Pharmaceutical Group Water for Injection Workshop TDS Online Monitoring Project
   Deployed 80 sets of MW-TDS101 TDS sensors at EDI, polishing mixed bed backend and storage tank return lines, 4-20mA signal connected to Siemens S7-1500 PLC and PCS7 system, achieving automatic tank switch logic when TDS >10 ppm. After commissioning, water for injection batch pass rate increased to 99.9%, annual pure water preparation cost decreased by about 15%.

2. North China Thermal Power Unit Circulating Cooling Water Concentration Ratio Automatic Control Project
   Deployed 60 sets of MW-TDS101 at cooling tower sump and makeup lines, output connected to Honeywell Experion PKS, achieving automatic blowdown valve opening when TDS >1800 ppm. After operation, concentration ratio fluctuation range narrowed to ±10%, heat exchanger scaling rate decreased by about 40%, corrosion/scale inhibitor consumption reduced by about 25%.

3. Yangtze River Delta Semiconductor Wafer Fab Ultrapure Water Preparation TDS Assessment Project
   Deployed 40 sets of MW-TDS101 at polishing mixed bed backend and points of use, data connected to cleanroom MES system, linked with TOC and particle sensors, achieving automatic alarm and system shutdown protection when TDS >1 ppm. After commissioning, ultrapure water TDS remained stable at 0.055~0.08 μS/cm long-term, batch pass rate reached 99.95%.

Frequently Asked Questions (FAQ)

1. What are the main differences between MW-TDS101 TDS sensor and traditional laboratory oven-drying gravimetric method in engineering applications?
   Online conductivity method enables continuous, unattended measurement, fast response, no chemical reagents; oven-drying gravimetric is offline intermittent, suitable for laboratory, cannot meet automatic station direct transmission and process interlocking requirements.

2. How to ensure long-term stability of TDS electrode in high turbidity wastewater scenarios?
   Recommended to configure pre-automatic filter unit (pore size 10~50 μm), daily automatic high-pressure backflush 1~2 times, electrode regular acid regeneration, typical maintenance cycle 6~12 months, drift controlled within ±5%.

3. How to prevent common signal attenuation issues in long-distance transmission with 4-20mA analog output?
   Recommended to use 0.5~1.0 mm² cross-section shielded cable, bus length ≤1000 m with load resistance ≤750Ω; over 1000 m recommend adding signal isolator or converting to RS485 module to avoid electromagnetic interference and voltage drop.

4. How does the TDS sensor meet high precision requirements of<10 ppm in pharmaceutical water for injection processes?
   Select high-precision conductivity assembly, cooperate with daily 1413 μS/cm standard solution calibration, use probe with metrological type approval to ensure indication error <±5%, meeting USP/EP water for injection online monitoring requirements.

5. How to achieve closed-loop control of TDS concentration with PLC blowdown valve?
   Sensor 4-20mA output connects to PLC analog input module, PLC uses built-in PID algorithm or simple threshold logic, increasing blowdown valve opening when TDS > set value, supports remote modification of set values and PID parameters.

6. How to extend TDS electrode life in high salinity circulating water?
   Select high salinity corrosion resistant electrode material, cooperate with automatic freshwater flushing program (daily or weekly timed), typical life extended from 12 months to 18~24 months.

7. How to ensure consistency between batches and long-term spare parts supply for bulk purchases?
   Provide batch consistency statement, core electrode component batch number traceability, 3~5 year spare parts inventory commitment, EOL advance notice 12 months prior with replacement solutions.

8. What core qualifications and test reports need to be submitted for TDS online monitoring system project acceptance?
   Metrological type approval certificate (CPA), CMA/CMA qualification report, ISO 9001 quality system certificate, probe IP68 protection test report, EMC test report, power lightning protection test report, third-party comparison test report.

9. How to achieve automated concentration ratio control through TDS and conductivity data in circulating cooling water projects?
   Set TDS >1800 ppm to trigger blowdown valve opening, conductivity linkage to determine concentration ratio; Nexisense edge gateway supports local simple logic control, reducing cloud dependency and network latency risks.

10. How does the TDS sensor meet data direct transmission and anomaly tracing requirements in industrial park wastewater total outlet projects?
    Supports NB-IoT/4G transparent transmission to provincial platform, built-in data cache + breakpoint resume function; TDS anomaly can link COD, ammonia nitrogen, pH and other multi-factor data to generate tracing curves, facilitating environmental law enforcement evidence collection.

Conclusion

The core value of industrial water quality monitoring lies in providing credible, continuous, and real-time TDS and other key parameter data support, helping system integrators and EPC contractors achieve process closed-loop control, compliant discharge supervision, and risk early warning. Nexisense MW-TDS101 TDS sensor, with high-precision conductivity measurement, compact size, open output, and engineering integration capabilities as core, provides stable and reliable perception layer solutions for high-requirement projects such as pharmaceutical ultrapure water, circulating cooling water, industrial wastewater compliance, semiconductor pure water preparation.

In the context of increasingly stringent environmental regulations and accelerated implementation of smart water affairs and industrial internet, selecting a sensor and edge computing partner with long-term supply assurance, fast customization response, and on-site implementation experience will directly determine project delivery quality, operation and maintenance costs, and long-term value.

System integrators, EPC contractors, and project technical leaders who need TDS sensor selection, communication scheme design, prototype verification, bulk quotation, or joint bidding support for specific working conditions are welcome to contact the Nexisense technical team at any time. We will provide targeted solution recommendations and on-site support to jointly promote the high-quality development of industrial water treatment and smart water affairs.