Suitable for any wort or mash
The time required for a volumetrically defined amount of fluid (the volume between two marks on the tube of the viscometer) to flow through a capillary of a defined length is measured.
Definition:
1 square meter per second is the kinematic viscosity of a homogenous fluid with a dynamic viscosity of 1 Pa × s and a density 1 kg/m3.
The unit for expressing kinematic viscosity (the relationship of viscosity to density = viscoplasticity) is 1 m2/s = 106 mm2/s
This method describes how to convert the viscosity of laboratory wort to reflect a pre-defined extract content.
Suitable for all worts and mashes.
The viscosity of the Congress wort primarily provides information regarding the cytolytic degradation of the malt. A better indicator of this, however, is the viscosity of the isothermal 65 °C mash. The Congress mash method consists of a longer β-glucan rest, the 45 °C rest, after which the mash is immediately heated to 70 °C, and thus excluding an adequate β-glucan solubilase rest. (R-206.00.002 Kongressmaischverfahren). Therefore, the degree of cytolytic degradation in different malts cannot be satisfactorily quantified. The isothermal 65 °C mash serves to reveal these differences more starkly through the high temperature at mashing-in and the intense β-glucan solubilase rest (R-207.00.002 Isotherme 65-°C-Maische). Likewise, it provides a good indication of the expected duration of the lautering process.
Determination the viscosity in beverages
wort, beer, beer-based beverages, juices, beverages in general
The amount of time required for a special ball to fall while sinking through a glass tube filled with a sample liquid between two marks is measured. The precision of this method is increased if the time is measured using a photoelectric beam to an accuracy of 0.01 s, rather than manually with a stopwatch.
Determination of the viscosity of beverages
wort, beer, beer-based beverages, NAB, juice, beverages in general
These devices measure the torque transferred through a cylindrical liquid layer between a stationary and a rotating disc. This method also allows changes in viscosity, which occur, e.g., through the action of α-amylase on starch, to be automatically recorded by a plotter or PC.
Determination of the viscosity of beverages
wort, beer, beer-based beverages, NAB, juice, beverages in general
Capillary viscometers measure the kinematic viscosity of Newtonian fluids, unlike falling ball and the rotational viscometers, which directly measure the dynamic viscosity. However, with values for the kinematic viscosity and the density of the test liquid, the dynamic viscosity can be calculated.
The time required for a volumetrically defined amount of fluid (the volume between two marks on the tube of the viscometer) to flow through a capillary of a defined length is measured.
1 square meter per second of a homogenous fluid with a dynamic viscosity of 1 Pa × s and a density 1 kg/m³
The unit for expressing kinematic viscosity (the relationship of viscosity to density = viscoplasticity) is 1 m²/s = 106 mm²/s
The kinematic viscosity is expressed as 1 square meter per second of a homogenous fluid with a dynamic viscosity of 1 Pa × s and a density 1 kg/m³.