The Inline Total Dissolved Solids (TDS) Sensor adopts a new generation of four-electrode/ six-electrode technology, with a wide measurement range, automatic switching measurement range, a built-in temperature sensor, and real-time temperature compensation. It has excellent anti-pollution ability and will not cause polarization even in a harsh environment for long-term online monitoring. An RS-485 output can be networked without a controller.

Features:

1. Digital sensor, RS485 output, support Modbus;
2. Wide measurement range, automatic switching measurement range.
3. Built-in temperature sensor, real-time temperature compensation;
4. Four-electrode/six-electrode technology, no polarization.

Technical parameter:

Inline Total Dissolved Solids (TDS) Sensor Video

FAQs

1. What is TDS?

TDS stands for Total Dissolved Solids, and it is used to measure the concentration of dissolved substances in a liquid, typically water. These substances include minerals, salts, and organic matter that are small enough to pass through a filter.

2. What is TDS used to measure?

TDS is used to:

Assess water quality – Higher TDS levels may indicate hard water or contamination.

Monitor drinking water purity – Safe drinking water usually has a TDS below 500 mg/L.

Evaluate the performance of water filters – Checking TDS before and after filtration.

Test aquariums, hydroponics, and pools – To maintain healthy water conditions for plants or animals.

Industrial applications – Like boiler water quality, or in food and beverage production.

3. What is a TDS sensor?

A TDS sensor is an electronic device that measures the total concentration of dissolved solids in water. It usually works by:

Measuring electrical conductivity (EC) of the water, because dissolved ions increase conductivity.

Converting the EC value into an estimated TDS value, typically reported in ppm (parts per million).

Common Types:

Handheld TDS meters – Portable and widely used for on-the-spot water testing.

Inline TDS sensors – Installed in water systems for continuous monitoring.

Note: TDS sensors give an estimate of total solids but don’t identify what the solids are (e.g., specific minerals or contaminants). For a detailed analysis, lab testing is needed.

4. What’s the difference between TDS and EC sensors?

EC sensor gives a direct reading of electrical conductivity (µS/cm or mS/cm).

TDS sensor converts EC to ppm using a multiplier.

Some devices offer dual EC/TDS readings.

5. What does a TDS sensor measure?

A TDS sensor estimates the total concentration of dissolved solids in water by measuring its electrical conductivity (EC) and converting it to parts per million (ppm).

6. What is a good TDS value for drinking water?

Ideal range: 0–300 ppm

Acceptable: Up to 500 ppm (as per WHO and EPA guidelines)

Above 500 ppm: May affect taste, and could indicate contamination or high mineral content

7. How does a TDS sensor work?

It measures electrical conductivity in water. Since dissolved salts and minerals conduct electricity, higher conductivity means higher TDS. The sensor converts this data into a TDS reading, typically using a conversion factor (~0.5–0.7, depending on the sensor and solution type).

8. What substances contribute to TDS?

-Calcium

-Magnesium

-Sodium

-Potassium

-Bicarbonates

-Chlorides

-Sulfates

-Organic matter and some metals

9. How often should I calibrate a TDS sensor?

Typically: Every 3–6 months

Or whenever readings seem inaccurate

10. Can TDS sensors be used in hot water?

Most TDS sensors are rated for room temperature to about 50°C (122°F). For higher temperatures, use a sensor rated for industrial or lab use.

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The post DS285 Inline Digital Total Dissolved Solids (TDS) Sensor appeared first on Water Quality Sensors.