Measuring device for measuring at least one measurand of a medium

A measuring device for measuring at least one measurand of a medium, the measuring device comprising:

• a measuring cell including a measurement chamber, which is configured to enable the medium to flow therethrough or configured to be filled with the medium, and a reference chamber, which is separate from the measurement chamber and is fillable or filled with a reference medium;
• a measuring cell receptacle configured to hold the measuring cell;
• and
• a measuring apparatus configured to measure the at least one measurand of the medium,
• wherein the measurement chamber and the reference chamber are arranged relative to each other such that the measuring cell is insertable into the measuring cell receptacle in a measuring position and in a reference position, wherein:
• when in the measuring position, measurements of the at least one measurand of the medium disposed in the measurement chamber or flowing through the measurement chamber are enabled using the measuring apparatus;
• and
• when in the reference position, reference measurements of at least one reference variable of the reference medium disposed in the reference chamber are enabled using the measuring apparatus.