How to Correlate Conductivity to Total Dissolved Solids (TDS) - Measurements - ConductiSense

The conductivity of water is extremely important when treating drinking water or industrial water because it gives an indication of the amount of dissolved material within that water.

The variation of conductivity in water is due to the substances dissolved in it, which are referred to as Total Dissolved Solids (TDS). TDS is measured in terms of mass and volume (g/l, for example), but multipliers can be used to convert this into conductivity if the ionic species are known. Sodium chloride, for example, uses a standard multiplier of 0.65.

Process Instruments supplies a range of high-quality low-cost conductivity sensors to cover the full range from deionised water all the way up to highly saturated brines.

FAQs:
How do I calibrate my meter for TDS if my dissolved solids are not the same as those in the calibration solutions sold?
Creating a standard solution yourself, which matches your sample stream more accurately, is a way to get a more accurate calibration. A proportional mixture of salts based on your sample stream can be added to distilled water, where 1mg of your salt mixture 1l of distilled water will yield a 1ppm TDS solution. Try to produce a standard that is close to your expected sample in concentration, or If you expect a great deal of variation make a solution that is in the upper third of the sensor range.

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