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
Malt intended for use in beer brewing or elsewhere in the food industry
While α-amylase is active in a gelatinized solution of amylopectin, the viscosity of the solution is constantly dropping due to the degradation of the starch molecules, which can be tracked using a rotational viscometer. The change in the reciprocal of the specific viscosity serves as a measure for the activity of α-amylase.
The method describes how to determine the viscosity of the laboratory wort using various kinds of falling ball viscometers.
Suitable for all worts and mashes
The amount of time required for a special ball to fall while sinking through a glass tube filled with a test fluid 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 stop watch.
The method describes how to determine the viscosity using a rotary viscometer.
Suitable for any wort or mash
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 through the action of α-amylase on starch, to be automatically recorded by a plotter or PC.
Malt intended for use in beer brewing or elsewhere in the food industry
Through the action of endo-β-glucanase on a β-glucan solution, the viscosity of the solution continuously decreases, due to the degradation of the substrate molecules, which is measured using a rotary viscometer. The change in the reciprocal of the specific viscosity is a measure for the activity of endo-β-glucanase.
The method describes how to determine the viscosity using a micro viscometer (e. g. Lovis).
Suitable for all worts and types of mash.
The measuring principle of the Lovis micro viscometer is based on the Höppler “Falling Ball Viscometer”. A ball of known dimension rolls through a closed capillary, which is inclined at a defined angle. Inductive sensors detect the ball along an exactly defined distance of approximately 100 mm or 25 mm. The rolling time is measured by the instrument and is used for dynamic viscosity calculation. The temperature is precisely regulated by thermoelectric Peltier elements and checked by a Pt-100 temperature sensor. A temperature accuracy of ±0.02 °C and repeatability of ±0.005 °C can be reached.