Method to determine the contents level of a first fluid in a container and to determine a presence of a second fluid below the first fluid and level measurement apparatus to execute said method

摘要

A level measurement device to measure the fill level of a fluid in a container, and a method to determine the contents level of a first fluid in a container and a presence of a second fluid below the first fluid. Microwave signals generated in the level measurement device are guided on a wave guide that is immersed in the first liquid. The measurement curve from received measurement signals is scanned for a first signal peak indicating a first fluid surface. The measurement curve is also scanned for a potential second signal peak having the same polarity as the first signal peak and thus indicating an interface between the first and a second fluid.