Determination of the foam stability
Beer and beer-based beverages
In an Lg foam tester, the foam stability is determined by measuring the time it takes for the foam to collapse in a glass cylinder.
The foam is produced by pressing a constant beer volume through a nozzle (Ø 0.6 mm). The precise metering of a predetermined quantity of beer is achieved by time-controlled operation of the valve in conjunction with pressurizing the sample bottle to 2.5 bar (± 5 mbar). As the foam collapses, the height is measured optically in the glass cylinder [1].