From measuring results 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 into 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 that measure the density at a certain set temperature (e.g. 20 °C), such as compact density meters, benchtop density meters, density and sound velocity meters, or measurement systems usually use conversion tables or conversion formulas of density and concentration at a certain temperature. Instruments that measure the density at ambient temperatures, such as portable density meters and handheld alcohol meters or inline process measuring systems, use polynomial functions based on tables of density and concentration at different temperatures.
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