Fill level sensor arrangement with heat insulation

A sensor arrangement configured to measure a filling level, a limit level, and/or a pressure, comprising:

• an antenna configured to transmit and/or receive a measurement signal;
• a waveguide having a first waveguide section for connection to the antenna and a second waveguide section and configured to transmit the measurement signal;
• and
• a heat insulator arranged between the first waveguide section and the second waveguide section and configured to at least partially prevent heat conduction between the first waveguide section and the second waveguide section,
• wherein the heat insulator is tubular in shape and consists of a heat-insulating material,
• wherein the heat insulator has an inner wall which is at least partially metallized, and
• wherein the inner wall of the heat insulator corresponds to an inner wall of the waveguide when the first waveguide section is connected to the first insulator and/or when the second waveguide section is connected to a second insulator.