Reflection microwave barrier

A method for monitoring a predefined limit of a vertical filling level of a filling material, wherein the predefined limit is a predefined height of the filling material,

• wherein the limit of the filling level is monitored in at least one working area by outputting a switching signal, comprising:
• continuously emitting a time modulated microwave signal in a direction substantially perpendicular to a direction of change of the vertical filling level;
• receiving a reflection of the microwave signal in the direction substantially perpendicular to the direction of change of the vertical filling level so that
• a) the reflection of the microwave signal at the vertical filling material occurs when the filling material reaches or exceeds the limit, and
• b) the reflection at the filling material does not occur when the filling material does not reach or exceed the limit;
• detecting and monitoring echo signals in the received reflection of the microwave signal;
• calculating a runtime of an echo signal;
• determining, based on the calculated runtime, whether the echo signal has been reflected within the at least one working area;
• and
• outputting the switching signal only when it is determined by the determining that the origin of the each signal lies within the at least one working area.

A non-transitory computer readable medium that when executed by processing circuitry of a reflection microwave barrier for monitoring a predefined limit of a vertical filling level of a filling material, wherein the predefined limit is a predefined height of the filling material,

• wherein the limit of the filling level is monitored in at least one working area cause the processing circuitry to implement a method comprising:
• continuously emitting a time modulated microwave signal in a direction substantially perpendicular to a direction of change of the vertical filling level;
• receiving a reflection of the microwave signal in the direction substantially perpendicular to the direction of change of the vertical filling level so that
• a) the reflection of the microwave signal at the vertical filling material occurs when the filling material reaches or exceeds the limit, and
• b) the reflection at the filling material does not occur when the filling material does not reach or exceed the limit;
• detecting and monitoring echo signals in the received reflection of the microwave signal;
• calculating a runtime of an echo signal;
• determining, based on the calculated runtime, whether the echo signal has been reflected within the at least one working area;
• and
• outputting the switching signal only when it is determined by the determining that the origin of the each signal lies within the at least one working area.