From Measuring Result to Concentration - Using and Creating Quantities

This application report explains how a measured quantity, such as density, is converted into another quantity of interest, such as a concentration value. It also explains how an additional quantity can be added or imported in the instruments’ software.

Why use or create quantities?

Many manufacturers of liquid products convert a measurement result such as density, sound velocity or refractive index into a more commonly used quantity, such as alcohol concentration in % v/v. Preset quantities or added custom quantities make this conversion possible. Many modern instruments are already equipped with numerous common conversion functions which are implemented as quantity. For more specific samples a custom quantity can be implemented.

Instruments which measure the density at a certain set temperature (e.g. 20 °C), such as DMA 501 I 1001 I 4101 I 4501 I 5001, DMA M, DSA 5000 M, SDA M (Soft Drink Analyzer M) or PBA (Packaged Beverage Analyzer) usually use conversion tables or conversion formulas of density and concentration at a certain temperature. Instruments which measure the density at ambient temperature, such as DMA 35, Snap 51 or inline process measuring systems, use polynomial functions based on tables of density and concentration at different temperatures.

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