Patent ID: 9163971
Filing Date: 2015-10-20
Classification: G01F

Abstract:
1. An evaluation apparatus for a level meter for determining a characteristic variable for a location of a boundary surface in a container, comprising: an echo curve evaluation device receiving and evaluating an echo curve generated by an electromagnetic wave; and an output device providing the characteristic variable for the location of the boundary surface, the output device being connected to the echo curve evaluation device; wherein the echo curve evaluation device is configured to recognize a multiple echo in the echo curve, to determine an electrical distance of the multiple echo, and to determine an order of the multiple echo; wherein the multiple echo has at least the order of one; wherein the order of the multiple echo corresponds to the number of reflections on the boundary surface reduced by the value 1; and wherein the echo curve evaluation device is configured to determine the characteristic variable for the location of the boundary surface in the container as a function comprising the order of the multiple echo, an electrical distance of the multiple echo and the relative permittivity of an overlaying atmosphere, and to provide the characteristic variable via the output device.