Method for Evaluation for Measurement Signals of a Level Gauge

1 - 5 . (canceled)

6 . A method for evaluation of measurement signals of a level gauge, which works according to the transit time principle, comprising the steps of:

transmitting a transmission signal towards a filling material;

receiving an echo signal of said transmission signal;

determining a fill level of the filling material according to the transit time principle of said echo signal;

determining at least one parameter of said echo signal; and

storing the values of the at least one parameter and the corresponding fill level in a first table, wherein:

the at least one parameter is a phase position of said echo signal and/or a rate at which the level of the filling material in a tank changes and/or a variation in the amplitude of said echo signal and/or a temperature of the filling material and/or a temperature change of the filling material and/or a change in the amplitude variation of said echo signal.

7 . The method according to claim 6 , further comprising:

a second table is created after a predetermined period of time has elapsed since said first table was created and in that at a certain fill level, the values corresponding to this filling level of the one parameter from said first table and from said second table are compared to determine the extent of deviation.

8 . The method according to claim 7 , wherein:

said level gauge is cleaned upon the occurrence of a predetermined deviation of one of the values of the at least one parameter at the same fill level between said first table and said second table.

9 . The method according to claim 8 , wherein:

the cleaning is an air purging.

10 . A level gauge, in particular a level gauge for a method which comprises the steps of transmitting a transmission signal towards a filling material;

receiving an echo signal of said transmission signal; determining a fill level of the filling material according to the transit time principle of said echo signal; determining at least one parameter of said echo signal; and storing the values of the at least one parameter and the corresponding fill level in a first table, wherein: the at least one parameter is a phase position of said echo signal and/or a rate at which the level of the filling material in a tank changes and/or a variation in the amplitude of said echo signal and/or a temperature of the filling material and/or a temperature change of the filling material and/or a change in the amplitude variation of said echo signal,

to the level gauge, comprising:

a transmitter/receiver, which can send transmission signals towards a filling material and receive echo signals;

a signal processing unit for determining the fill level of the filling material from at least one parameter of the echo signal according to the transit time principle; and

a memory for storing the values of the at least one parameter of the echo signal and the corresponding fill level in a table, wherein:

the at least one parameter is a phase position of the echo signal and/or a rate at which a height of the filling material in a tank changes and/or a change in amplitude of the echo signal and/or a temperature of the filling material and/or a temperature change of the filling material and/or a change in the amplitude variation of the echo signal.

11 . The method according to claim 9 , wherein:

the purging is an air purging.

12 . The method according to claim 8 , wherein:

a transmitter/receiver of said level gauge is cleaned.