Method for continuously determining the lactose, protein, and fat content of milk

A method for determining a lactose content a, a protein content b, and a fat content c of a flowable medium, wherein the flowable medium is milk, a milk substitute, and/or a milk product, the method comprising:

• determining a frequency-dependent relative permittivity of the flowable medium across a frequency range of a frequency spectrum;
• wherein the frequency spectrum has an upper limit of 50 GHz, and
• wherein the frequency spectrum has a lower limit of 10 MHz;
• and
• calculating the lactose content a, the protein content b, and the fat content c based on the relative permittivity determined and based on a lactose reference, a protein reference, and a fat reference.

A measuring assembly for determining a lactose content a, a protein content b, and a fat content c of a flowable medium, comprising:

• a measuring tube for carrying the medium;
• at least one microwave antenna, wherein the at least one microwave antenna is arranged on the measuring tube;
• and
• transducer electronics that is designed to:
• determine a frequency-dependent relative permittivity of the flowable medium across a frequency range of a frequency spectrum;
• wherein the frequency spectrum has an upper limit of 50 GHz, and
• wherein the frequency spectrum has a lower limit of 10 MHz;
• and
• calculate the lactose content a, the protein content b, and the fat content c based on the relative permittivity determined and based on a lactose reference, a protein reference, and a fat reference.