Patent ID: 8701483

Claim:
A measuring device operating according to a transit time method, comprising: a container holding a fill medium which comprises a first liquid and a second liquid of lower density than the first liquid, the container includes a first sub-region, a second sub-region and at least one connection between the first and second sub-regions, the connection configured to exchange liquid between the first and second sub-regions; a first measuring apparatus acquiring a first echo curve that illustrates the reflection conditions within the first sub-region; a second measuring apparatus acquiring at least one second echo curve that illustrates the reflection conditions within the second sub-region; and an evaluation unit: determining a first characteristic value of the first echo curve relating to the fill level of the two liquids; determining a second characteristic value of the first echo curve relating to the position of a separating layer between the two liquids in the first sub-region of the container; determining a third characteristic value of the second echo curve relating to the fill level of the two liquids in the second sub-region of the container; and calculating at least one fourth characteristic value relating to the position of a virtual separating layer between the two liquids in the second sub-region, wherein the evaluation unit uses the first and second characteristic values of the first echo curve and the third characteristic value of the second echo curve.