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
First Claim
1. A fill-level measuring device for ascertaining andmonitoring 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 andsaid 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, andthere 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.
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Accused Products
Abstract
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. The device comprises a measurement transmitter and an antenna unit, which is constructed at least of a hollow conductor and a radiating element A microwave transmissive, process isolating element is inserted for process isolation into the hollow conductor between the measurement transmitter and the horn shaped radiating element contacting the process space. The process isolating element is embodied as a hollow body having at least one tubular hollow body region matched to the shape of the hollow conductor, and a pointed hollow body region neighboring the hollow body region in the direction of the radiating element and having a wall thickness selected based on reflection, or lack thereof, of the microwave signals.
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Citations
10 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification