Digital TDS Meter Online
Digital TDS Meter Online is an industrial instrument used for continuous measurement of Total Dissolved Solids in water. It is suitable for RO plants, DM water plants, ETP/STP plants, cooling towers, boiler-water treatment, process-water monitoring and industrial water-treatment systems.
UMA Industries supplies online TDS meters, digital TDS indicators, TDS controllers, conductivity meters, pH meters, ORP meters and industrial water-quality instruments for panel mounting, automation systems, PLC panels, RO plants and industrial process applications.
A Digital TDS Meter Online helps operators continuously monitor dissolved salts, minerals and ionic impurities in water. It is commonly used where manual testing is not sufficient and continuous display is required for treated water, process water, RO permeate water and reject water.
Technical Specifications of Digital TDS Meter Online
- Product Name: Digital TDS Meter Online
- Measurement Parameter: TDS / Total Dissolved Solids
- Display: Digital LED display
- Mounting: Panel-mounted online type
- Panel Size: 96 mm × 96 mm × 85 mm
- Operating Supply: 220-230 VAC, 50 Hz
- Sensor Input: Conductivity/TDS sensor input
- Calibration: Front-panel calibration facility
- Optional Output: 4-20 mA, 0-10 VDC or RS485 Modbus RTU, depending on model
- Application: RO, DM plant, ETP, STP, cooling tower, boiler feed water and process water
- Installation: Control panel, RO panel, water-treatment panel or automation panel
What is Digital TDS Meter Online?
Digital TDS Meter Online is a panel-mounted instrument that continuously measures and displays the TDS value of water. TDS means Total Dissolved Solids, which indicates dissolved salts, minerals and ionic impurities present in water.
The TDS value is normally displayed in ppm or mg/L. In industrial water-treatment systems, TDS monitoring helps operators understand water quality, RO performance, membrane condition, process-water suitability and treatment efficiency.
Why Digital TDS Meter Online is Used
- To continuously monitor dissolved solids in water
- To check RO feed-water and permeate-water quality
- To monitor DM plant and treated-water performance
- To reduce repeated manual testing
- To support water-treatment process control
- To provide online indication in control panels
- To help identify RO membrane or process-water quality issues
Applications of Digital TDS Meter Online
RO Plants
RO plants use Digital TDS Meter Online for feed water, permeate water, reject water and final treated-water monitoring. It helps operators check RO membrane performance and water quality.
DM Water Plants
DM plants use TDS and conductivity monitoring to check dissolved solids and ionic impurities in treated water.
ETP Plants
Effluent-treatment plants use online TDS meters for treated-water checking, discharge monitoring and process-water quality observation.
STP Plants
Sewage-treatment plants use TDS meters for treated-water quality monitoring, reuse-water applications and final discharge checking.
Cooling Towers
Cooling-tower systems use TDS measurement for blowdown control, chemical-treatment checking, scaling reduction and water-conservation planning.
Boiler Feed Water
Boiler systems require water-quality monitoring to reduce scaling, corrosion and process disturbance. TDS monitoring supports feed-water and blowdown management.
Food and Beverage Industries
Food and beverage industries use online TDS meters for treated water, process water, cleaning-water systems and quality-control applications.
Pharmaceutical Utilities
Pharmaceutical plants use TDS and conductivity monitoring for RO water, DM water, purified-water support systems and process utilities.
Chemical and Process Industries
Chemical industries use TDS meters for process water, wastewater, chemical dilution, washing systems and treated-water monitoring.
Textile and Dyeing Industries
Textile and dyeing plants use TDS monitoring for process water, washing water, dyeing-water quality and effluent-treatment systems.
Advantages of Digital TDS Meter Online
- Continuous online TDS measurement
- Clear digital indication
- Suitable for industrial control panels
- Useful for RO and water-treatment plants
- Reduces manual testing frequency
- Helps monitor membrane performance
- Simple calibration and operation
- Optional analog and digital output models available
- Suitable for automation and SCADA applications
How Digital TDS Meter Online Works
The TDS sensor is installed in the water line, sample chamber or flow cell. The instrument measures the conductivity of water and converts the measured value into TDS reading according to the selected range and conversion factor. The result is displayed on the digital display.
In advanced models, the measured TDS value can also be transferred to PLC, HMI, SCADA, recorder or remote monitoring system using 4-20 mA output, 0-10 VDC output or RS485 Modbus RTU communication.
Digital TDS Meter Online with Output Options
Digital TDS Meter with 4-20 mA Output
This model is suitable where the TDS value needs to be transmitted to PLC, recorder, remote display or SCADA system through analog signal.
Digital TDS Meter with 0-10 VDC Output
This model is suitable for analog monitoring systems, automation panels and special control applications requiring voltage output.
Digital TDS Meter with RS485 Modbus RTU
This model is suitable for PLC, HMI, SCADA and data-logging applications where digital communication is required.
Installation Instructions for Digital TDS Meter Online
- Install the TDS meter in a clean and dry electrical panel.
- Install the TDS sensor in a proper flow cell or sample line.
- Ensure continuous water flow around the sensor.
- Avoid air bubbles around the sensing area.
- Keep sensor cable away from motor, VFD and high-voltage wiring.
- Use proper grounding in the electrical panel.
- Use shielded cable for long signal wiring where required.
- Verify the local display reading before connecting to automation systems.
- Provide easy access for sensor cleaning and calibration.
Calibration Procedure for Digital TDS Meter Online
- Switch ON the TDS meter and allow the reading to stabilise.
- Clean the TDS sensor properly before calibration.
- Use a standard TDS or conductivity calibration solution.
- Dip the sensor into the calibration solution.
- Wait until the displayed reading becomes stable.
- Adjust the calibration setting according to the standard solution value.
- Rinse the sensor with clean water after calibration.
- Recheck the reading to confirm calibration accuracy.
Work Instructions and Precautions
- Clean the TDS sensor regularly according to water contamination.
- Do not install the sensor where air bubbles are continuously present.
- Do not run signal cable with power cable in the same conduit.
- Protect the instrument from water splash, dust and chemical fumes.
- Use fresh and correct-value standard solution for calibration.
- Check sensor scaling or fouling in high-TDS water applications.
- Verify wiring and calibration before replacing the instrument.
- Replace the sensor if readings become unstable or incorrect after cleaning and calibration.
Difference Between TDS Meter and Conductivity Meter
A conductivity meter measures the electrical conductivity of water, normally in µS/cm or mS/cm. A TDS meter displays the dissolved-solids value, generally in ppm or mg/L, based on conductivity conversion. Many industrial water-treatment systems use both conductivity and TDS measurement according to application requirement.
Difference Between TDS Meter and TDS Controller
A Digital TDS Meter Online measures and displays the TDS value. A TDS controller may also provide relay output for alarm, dosing, valve operation, reject control or process interlocking. For automatic control applications, relay-output controller models can be selected.
Related Water Quality Instruments
- Digital pH Meter Online – For continuous pH measurement in water and process liquids.
- pH Meter with 4-20 mA Output – For PLC, recorder and SCADA systems.
- RS485 Modbus RTU pH Controller – For PLC, HMI and SCADA integration.
- pH Controller with One Relay – For chemical dosing and alarm applications.
- pH Controller with Two Relay Outputs – For acid and alkali dosing control.
- pH Sensor and Electrode – Replacement electrode for pH meters and controllers.
View more instruments in our pH Meter product category.
Industries Using Digital TDS Meter Online
- RO plant manufacturers
- DM plant manufacturers
- ETP and STP contractors
- Water-treatment companies
- Pharmaceutical industries
- Food and beverage industries
- Chemical industries
- Textile and dyeing industries
- Cooling-tower chemical-treatment companies
- Boiler-water treatment companies
- System integrators and automation companies
- PLC, HMI and SCADA panel manufacturers
7 Powerful Benefits of Digital TDS Meter Online
- Continuous online TDS monitoring
- Clear digital display for operators
- Better RO and water-treatment performance tracking
- Reduced manual water testing
- Useful for process-water and treated-water monitoring
- Optional 4-20 mA, 0-10 VDC and RS485 models available
- Suitable for industrial control panels and automation systems
FAQs About Digital TDS Meter Online
What is Digital TDS Meter Online?
Digital TDS Meter Online is a panel-mounted instrument used for continuous measurement and display of Total Dissolved Solids in water.
Where is this TDS meter used?
It is used in RO plants, DM plants, ETP plants, STP plants, cooling towers, boiler-water systems, process-water systems and industrial automation panels.
What does TDS mean?
TDS means Total Dissolved Solids. It indicates dissolved salts, minerals and ionic impurities present in water.
Can it be used in RO plants?
Yes, it is widely used in RO plants for feed water, permeate water, reject water and final treated-water monitoring.
Can it be used for DM water?
Yes, suitable models can be used in DM water systems for treated-water quality monitoring.
Is 4-20 mA output available?
Yes, 4-20 mA output can be provided in suitable models for PLC, recorder, remote display and SCADA applications.
Is 0-10 VDC output available?
Yes, 0-10 VDC output can be provided in suitable models for analog monitoring applications.
Is RS485 Modbus available?
Yes, RS485 Modbus RTU communication can be provided in suitable models for PLC, HMI, SCADA and data logging.
Does the TDS meter need calibration?
Yes, calibration is required using standard TDS or conductivity solution to maintain measurement accuracy.
What is the difference between TDS and conductivity?
Conductivity is the electrical conductivity of water. TDS is a calculated dissolved-solids value based on conductivity conversion.
Can this meter be used for high-TDS water?
Yes, high-TDS applications can be handled by selecting the correct sensor and instrument range.
Do you supply Digital TDS Meter Online in India?
Yes, UMA Industries supplies digital TDS meters, online TDS meters, TDS controllers and water-quality instruments throughout India.
External Technical References
Business Partner and Dealer Opportunity
Dealers, distributors, RO plant manufacturers, ETP/STP contractors, control-panel manufacturers, PLC/SCADA system integrators and industrial-instrument suppliers may contact UMA Industries for business cooperation involving digital TDS meters, pH meters, pH controllers, conductivity meters, electrodes and industrial water-quality instruments.
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- YouTube Channel – Product demonstrations and updates.
- MCS Facebook Page – Product news and updates.
- Robotech Learning Channel – Technical tutorials and product videos.
Buy Digital TDS Meter Online
Contact UMA Industries for pricing, technical specifications, TDS range selection, sensor selection, output selection and correct model recommendations. We supply Digital TDS Meter Online, online TDS meters, pH meters, pH controllers, electrodes and industrial water-quality instruments throughout India.
Need help choosing? Call/WhatsApp us for industrial pH/ORP solutions.
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