What is Conductivity to TDS Conversion?
Electrical conductivity (EC) and Total Dissolved Solids (TDS) are two primary indicators used to assess water quality. While conductivity measures the ability of water to pass an electric current, TDS refers to the total weight of all minerals, salts, or metals dissolved in a given volume of water. Since dissolved ions conduct electricity, there is a direct relationship between the two.
How the Calculator Works
The conversion from Conductivity (measured in microSiemens per centimeter, µS/cm) to TDS (measured in parts per million, ppm) is not a simple 1:1 ratio. It relies on a conversion factor that accounts for the specific types of ions present in the liquid. The standard mathematical formula used by this tool is:
TDS (ppm) = Conductivity (µS/cm) × Conversion Factor
Choosing the Right Conversion Factor
The conversion factor typically ranges between 0.50 and 1.00. Choosing the right one is critical for accuracy:
- 0.50: Commonly used for sodium chloride (NaCl) solutions.
- 0.64 - 0.70: Used for general freshwater and agricultural applications (often called the 442 conversion).
- 0.67: A widely accepted average for municipal water systems.
Frequently Asked Questions
Can I convert TDS back to Conductivity?
Yes, simply divide the TDS value by your chosen conversion factor to estimate the conductivity level.
Does temperature affect the reading?
Absolutely. Conductivity is highly sensitive to temperature. Most modern EC meters automatically compensate for temperature (ATC), but manual calculations should ideally be performed at a standard reference temperature of 25°C.
Why is TDS important?
TDS levels affect the taste of drinking water, the health of aquatic life in aquariums, and the efficiency of industrial equipment like boilers and cooling towers.