Patent ID: 9134165
Filing Date: 2015-09-15
Classification: G01B,G01F,G01K,G01N

Abstract:
1. A method for detecting accretion or abrasion on a first measuring tube, which is embodied as a first component of a flow measuring device flowed through by medium, said method comprising: registering a first temperature as a function of time via a first temperature sensor, which is arranged on the first measuring tube in such a manner that, between the first temperature sensor and the medium, at least one measuring tube wall of the first measuring tube is embodied; and, parallel in time, registering a second reference temperature as a function of time via a second temperature sensor, which is spaced from the first temperature sensor, and is thermally coupled to the medium via at least a second component of the flow measuring device, said second component being provided between the second temperature sensor and the medium and being contacted by the medium; determining, from at least the first temperature as a function of time and the second reference temperature as a function of time, at least one variable characteristic for heat transfer from the medium through the measuring tube wall to the first temperature sensor, said at least one variable characteristic for heat transfer being determined from at least one of: the derivative with respect to time of the first temperature as a function of time and of the second reference temperature as a function of time and the derivative with respect to time of a curve obtained via a predetermined, mathematical combining of the first temperature as a function of time and the second reference temperature as a function of time; and detecting accretion or abrasion on the first measuring tube, if the at least one determined characteristic variable or a variable derived therefrom deviates by more than a limit value from a predetermined reference variable.