There are two ways to measure TDS – Total Dissolved Solids:
1. The gravimetric method is considered the most accurate and involves evaporating the sample to dryness at 103 °C, then to 180 °C to remove any occluded water, then weighing it with a precision balance capable of 0.0001 gram. Gravimetric analysis is best, although slow, and has inaccuracies from evaporation of low
boiling point chemicals. Use the result to adjust the TDS analyzer‘s solids content factor to achieve the reading.
2. By use of known TDS standards. IC Controls offers TDS standards as sodium chloride ppm or mg/L, made with NIST SRM traceable materials. Calibration
becomes simply a mater of dipping the TDS sensor into the selected standard and calibrating.
Learn more:
- Blog – Meeting Environmental Standards for TDS in Wastewater Treatment
- Technical Article – Total Dissolved Solids Measurement
