Protection apparatus for a hollow conductor and method for producing a protection apparatus

A housing apparatus, comprising:

• a hollow conductor adapted for guiding an electromagnetic wave having a predetermined wavelength comprising an edge surface extending substantially perpendicularly to a propagation direction of an electromagnetic wave guided by the hollow conductor;
• a wall element configured to at least one of absorb and exert a force acting substantially perpendicularly to the propagation direction of the electromagnetic wave, the wall element being formed at least in part as an antenna device, the antenna device comprising at least one of a process separation and a filling at a first end, the antenna device adapted to guide and beam form the electromagnetic wave received by the hollow conductor;
• and
• a protection apparatus comprising a bearing surface and having a longitudinal axis extending perpendicularly to the bearing surface, the protection apparatus arranged on an end of the hollow conductor to at least one of absorb and exert a force directed substantially perpendicularly to the propagation direction of the electromagnetic wave so that the bearing surface of the protection apparatus maintains contact with the edge surface of the hollow conductor, the protection apparatus arranged between the hollow conductor and the antenna device, the protection apparatus further comprising:
• a fastening device fastening the protection apparatus to the end of the hollow conductor, the fastening device designed to at least one of absorb a force acting substantially perpendicularly to the longitudinal axis and exert a force acting substantially perpendicularly to the longitudinal axis to maintain the bearing surface in contact with the edge surface of the hollow conductor;
• and
• a blocking device having a predetermined sealing effect and adapted to allow the electromagnetic wave guided by the hollow conductor to pass through in a substantially unattenuated manner, the blocking device comprising the bearing surface that is maintained in substantially direct contact with the edge surface of the hollow conductor by the fastening device.

A field device, comprising:

• a sensor configured to at least one of generate and receive an electromagnetic wave;
• and
• a housing apparatus, comprising:
• a hollow conductor adapted for guiding an electromagnetic wave having a predetermined wavelength and comprising an edge surface extending substantially perpendicularly to a propagation direction of the electromagnetic wave guided by the hollow conductor;
• a wall element configured to at least one of absorb and exert a force acting substantially perpendicularly to the propagation direction of the electromagnetic wave, the wall element being formed at least in part as an antenna device, the antenna device comprising at least one of a process separation and a filling at a first end;
• and
• a protection apparatus comprising a bearing surface, the propagation apparatus arranged on an end of the hollow conductor to at least one of absorb and exert a force directed substantially perpendicularly to the propagation direction of the electromagnetic wave so that the bearing surface of the protection apparatus maintains contact with the edge surface of the hollow conductor.

A protection apparatus for a hollow conductor adapted for guiding an electromagnetic wave having a predetermined wavelength and comprising an edge surface extending substantially perpendicularly to the electromagnetic wave guided by the hollow conductor, the protection apparatus comprising:

• a fastening device fastening the protection apparatus to an end of the hollow conductor;
• and
• a blocking device having a predetermined sealing effect and adapted to allow the electromagnetic wave guided by the hollow conductor to pass through in a substantially unattenuated manner, the blocking device comprising a bearing surface that is maintained in substantially direct contact with the edge surface of the hollow conductor by the fastening device,
• wherein the protection apparatus having a longitudinal axis extending perpendicularly to the bearing surface, and
• wherein the fastening device is designed to at least one of absorb a force acting substantially perpendicularly to the longitudinal axis and exert a force acting substantially perpendicularly to the longitudinal axis to maintain the bearing surface in contact with the edge surface of the hollow conductor.

A method for producing a protection apparatus, comprising:

• providing a stainless steel ring having a predetermined external diameter;
• providing a film having a predetermined sealing effect and is substantially permeable to an electromagnetic wave;
• laminating the film onto the stainless steel ring so that at least one of the two openings of the stainless steel ring is sealed by the film;
• and
• cutting the film so that the film aligns with the external diameter of the stainless steel ring.