/ WORT, BEER AND BEER-BASED BEVERAGES / Beverages in General / Density Measurement/Apparent Specific Gravity (sL20/20)

B-590.08.904 [2020-10] Density – Oscillating U-Tube Density Measuring Device

Definitions: Density – Specific Gravity – Apparent Specific Gravity (SG_A20/20)

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Density: The mass of a substance divided by its volume, unit: g/cm³ or kg/m³.

Density of water at 20 °C: 0.9982071 g/cm³ or 998.2071 kg/m³
Density of dry air at 1013 mbar: 1.2046 kg/m³

Specific Gravity: Density of a substance at 20 °C divided by the density of the same volume of water at 20 °C.

Specific gravity of water at 20 °C: 1.0000
Specific gravity of air at 1013 mbar and 20 °C: 0.001208

Specific gravity does not have a unit.

Apparent specific gravity (SG_A20/20): Apparent density of the sample at 20 °C divided by the apparent density of water at 20 °C. Water possesses an apparent specific gravity of 1.0000 at 20 °C; air does not have an apparent specific gravity (i.e., 0.0000).

The apparent specific gravity does not have a unit.

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non-alcoholic beverages

beverages

liquids

EBC

Application/Purpose

Determination of the density of a liquid by means of an oscillating U-tube device

Scope of Application

wort, beer, beer-based beverages, non-alcoholic beverages, beverages, liquids

Principle

Determining the density with a digital density measuring device is performed by the electric excitation of a measurement cell (oscillating U-tube) filled with the solution to be analyzed. As the solution increases in density (corresponding to an increase in mass at the same volume in the measurement cell), this has an effect on the oscillation period (resonance frequency) in the measurement cell. The density can then be calculated from the oscillation period and from this value, the other quantities, e.g., extract content, can be extrapolated [1, 2, 3].