Determination of original gravity, alcohol and extract content by measuring the density using a flexural oscillator and the sonic velocity in beer or beer-based beverages.
wort, beer, beer-based beverages
The speed of sound in a liquid is a function of the alcohol and extract content and the temperature. Over a travel distance of 5 mm defined by two parallel surfaces, the speed of sound propagates as a function of the concentration of the dissolved substances. The speed of sound is defined by the quotient of the running distance s and the measured time t [1]. The density of the test liquid is a function of the concentrations of alcohol and extract content. Therefore, the actual extract, alcohol and original wort content can be determined from the speed of sound (ν) and the density.
This method describes how to determine the hectoliter weight of barley.
Barley intended for the production of malt is evaluated on the basis of the hectoliter weight.
The hectoliter weight determines how many kilograms 100 liters of barley weighs. For this analysis, the weight of a defined sample volume of barley is determined, and the corresponding hectoliter weight is calculated.
One hectoliter of malting barley generally weighs between 68 and 75 kg, although higher values are not unusual (up to 78 kg).
Prior to storage, the moisture content of barley must be determined.
Measurement of the electrical resistance in the ground and pressed sample
This method describes how to determine the extract content of liquid adjuncts by means of relative density measurement.
Adjuncts in liquid form which are soluble in water
Determination of relative density sL 20/20 °C with a pycnometer or other suitable density measurement device
Malt intended for use in beer brewing or elsewhere in the food industry
The determination of the color of the Congress wort is carried out by measuring the absorbance of the wort at 430 nm and then multiplying the value by a specified factor.
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.