What is the difference between an online salinity meter and an online conductivity/TDS meter?

A salinometer measures soluble salts, a conductivity meter measures conductivity, and a TDS meter can determine total dissolved solids (TDS). (The detection principle of some salinometers is to measure conductivity…) The targets being measured are different, right?

This post was last edited by qugd on 2020-12-25 at 13:27. The original poster had better understand carefully the conversion between salinity and conductivity; expressing salt content through conductivity is based on the conductivity of the substance that represents salt. Some indirectly measured indicators should not be mechanically interpreted as meaning that Person A fully agrees with Person B; rather, it is necessary to understand the relationships between them. The conductivity method for determining water salinity is based on converting the measured conductivity value into the concentration of potassium chloride or sodium chloride corresponding to that conductivity, thereby indicating the salt content in the water. In other words, this conversion assumes that all the conductive ions in the water are those from sodium chloride or potassium chloride; however, in reality, this is not usually the case. For practical purposes, it is necessary to find a representative substance, and since potassium chloride or sodium chloride are the most common salts, they are used as representatives in this context. If it has been confirmed that the salt in the water is mainly sodium sulfate, it can also be converted to sodium sulfate.

Thank you! We are looking for a way to measure salt content without using the principle of conductivity. The measurement principle of common salinometers available on the market is based on the relationship between the electrical conductivity of a solution and its salt content

Thank you! If the requirements are not high, the conductivity or TDS can be measured, and the salinity can be calculated using software