Fill-level measuring device for ascertaining and monitoring fill level of a medium located in the process space of a container by means of a microwave travel time measuring method

A fill-level measuring device for ascertaining and

• monitoring fill level of a medium located in the process space of a container by means of a microwave travel time measuring method, such device comprising:
• a measurement transmitter;
• an antenna unit, which is constructed at least of a hollow conductor and a horn shaped radiating element;
• and
• a microwave transmissive, process isolating element inserted for process isolation into said hollow conductor between said measurement transmitter and
• said horn shaped radiating element contacting the process space, wherein:
• said process isolating element is embodied as a hollow body having at least one tubular hollow body region matched to the shape of said hollow conductor, and a pointed hollow body region neighboring said tubular hollow body region in the direction of said radiating element and having a wall thickness selected based on reflection, or lack thereof, of the microwave signals, and
• there is present in said tubular hollow body region of said process isolating element up to said pointed hollow body region a metal tube electrically connected with said hollow conductor or, electrically connected with said hollow conductor, a metal coating of the inner wall of said tubular hollow body region of said process isolating element.