| 摘要 |
A method for ascertaining and monitoring fill level of a medium in a container by means of a field device with a travel time measuring method, wherein, in a learning phase, application- and device referenced test signals and response signals expected from a fill level upper surface are determined and, therefrom, application- and device referenced comparison signals are ascertained, wherein, in an operational phase, test signals are transmitted toward the medium and application- and device referenced, response signals are received, as well as, by means of a comparison algorithm, the comparison signals are compared with the response signals and a value for an agreement probability is ascertained, and wherein, upon exceeding the ascertained value of the agreement probability above a predetermined limit value, the fill level is ascertained and outputted as a measured value and/or, in the case of subceeding, or falling beneath, the predetermined limit value, a new test signal is transmitted for renewed ascertaining of a response signal. |
