Apparatus for Measuring Fill Level of a Substance in a Container

1 - 7 . (canceled)

8 . An apparatus for measuring fill level of a fill substance in a container, comprising:

a fill level sensor, which is so embodied that it determines fill level via one of:

a travel-time difference measuring method and a capacitive measuring method;

a limit-level sensor for monitoring a limit-level of the fill substance in the container; and

an electronics unit, which is associated with said fill-level sensor and/or said limit-level sensor, wherein:

said electronics unit determines, based on measurement data of said fill-level sensor, the fill level of the fill substance in the container; and

said electronics unit monitors, based on measurement data of said limit-level sensor the limit-level of the fill substance in the container.

9 . The fill-level measuring device as claimed in claim 8 , wherein:

said fill-level sensor is embodied as a TDR fill-level sensor for measuring the fill level based on time-domain reflectometry.

10 . The fill-level measuring device as claimed in claim 9 , wherein:

said fill-level sensor is embodied as a metal rod or as a metal cable.

11 . The fill-level measuring device as claimed in claim 8 , wherein:

said fill-level sensor is embodied as a coaxial probe for capacitively measuring fill level.

12 . The fill-level measuring device as claimed in claim 8 , wherein:

said fill-level sensor is embodied as a radar antenna or as an ultrasonic sensor.

13 . The fill-level measuring device as claimed in claim 8 , wherein:

said limit-level sensor is embodied as a thermal, resistive, optical or capacitive limit-level sensor.

14 . The fill-level measuring device as claimed in claim 8 , wherein:

said limit-level sensor is embodied as a gas sensor for determining measured variables of surrounding air.