Comprehensive Guide to Total Dissolved Solids (TDS)
Total Dissolved Solids (TDS) refers to the combined content of all inorganic and organic substances contained in a liquid.
In the context of water, TDS includes minerals, salts, and metals dissolved in water, which can affect its taste, quality, and safety.
Understanding TDS is crucial as it helps in assessing water quality for consumption and industrial use.
High TDS levels can lead to adverse health effects, while low levels might indicate a lack of essential minerals.
The World Health Organization recommends maintaining TDS levels between 50-300 mg/L for optimal health benefits.
Advanced Features of the QP481 Meter
QP481 Conductivity/TDS Meter Highlights
Accurate TDS Measurement
The QP481 Meter provides precise TDS readings, ensuring accurate assessment of water quality in various environments.
Versatile Conductivity Testing
With a wide range of glass and polymer sensors, the QP481 can measure electrical conductivity and TDS in a wide range of water samples.
User-Friendly Interface
Designed with simplicity in mind, the QP481 features an intuitive interface that allows easy operation for both professionals and beginners.
Customizable TDS Factor
The QP481 Meter allows users to input variable TDS factors, providing flexibility to accommodate different types of dissolved salts in water.
The TDS Factor
Each salt will have a different conductivity when a fixed amount is dissolved in water. We cannot however account for variations in the constituency of all types of water in the world so, a general factor is applied to convert Conductivity to TDS, to ensure that results can be compared by using a common base.
To convert electrical conductivity (EC) to Total Dissolved Solids (TDS), you can use the formula:
TDS = EC × 0.64
Where EC (Conductivity) is measured in microsiemens per centimeter (µS/cm) using a QP481 conductivity TDS Meter.
Total Dissolved Solids (TDS) is typically expressed in parts per million (ppm) or milligrams per liter (mg/L).
For example, if the electrical conductivity of a water sample is 500 µS/cm, the TDS can be calculated as follows:
TDS = 500 × 0.64 = 320 ppm
The QP481 Conductivity /TDS Meter will automatically convert the TDS concentration to grams/litre (g/l) when the TDS levels are elevated e.g. Sea water.
So for a sample reading 2.500ms/cm the TDS is calculated as follows:
TDS = 2.500 x 0.64 = 1.60 g/l
The conversion factor (0.64) is an average value and may vary depending on the specific ions present in the water. For more accurate results, a different conversion factor may be used based on the water’s composition.
Salinity for example has its own factor which enables the approximate salt (NaCl) concentration to be determined assuming that it is the predominant dissolved mineral.
Some sources suggest using a conversion factor of 0.67 for certain types of water, particularly those with higher concentrations of specific salts.
The QP481 Meter has a variable TDS factor input option so the factor for any dissolved salt can be entered. This means that the QP481 can be used as a concentration meter for e.g.
Salt (salinity as Sodium Chloride)
Hardness (Calcium salts)
Discover the QP481 Conductivity/TDS Meter
Ensure the quality of your water with the precision of the QP481 Conductivity/TDS Meter. Designed for both professionals and enthusiasts, this device offers accurate measurements of total dissolved solids, helping you maintain optimal water quality. Don’t compromise on health—get reliable results every time.