System for measuring an amount of liquid in an elastic bag

A system for measuring an amount of liquid in an elastic bag, wherein the elastic bag comprises:

• a gas phase in addition to the liquid phase formed by the liquid, wherein in the operational position of the elastic bag there is formed in the lower area of the elastic bag a liquid opening for retrieving liquid from the elastic bag;
• the system further comprising:
• at least two push elements, the at least two push elements abut at opposite walls of the elastic bag and the at least two push elements are spaced apart from one another;
• at least one drive unit, wherein the at least one drive unit is configured to drive at least one of the at least two push elements, wherein the at least two push elements may be moved towards one another by driving the at least one push element of the at least two push elements;
• at least one sensor;
• a control unit, wherein the control unit is configured to communicate with the at least one sensor and the at least one drive unit;
• and
• a gas opening, wherein the gas opening opens into the gas phase;
• wherein the at least one sensor is configured to measure a liquid level of the liquid in the elastic bag, wherein the control unit is configured to calculate an amount of liquid in the elastic bag on the basis of the liquid level and the distance between the at least two push elements, and wherein the liquid level of the liquid in the elastic bag is changeable by reducing the distance between the at least two push elements by the at least one drive unit.