US 12,111,369 B2
Monitoring the condition of a vibronic sensor
Mohammad Sadegh Ebrahimi, Lörrach (DE); Franco Ferraro, Schopfheim (DE); Romuald Girardey, Blotzheim (FR); Raphael Kuhnen, Schliengen (DE); Izabella Sandor, Schopfheim (DE); and Ralf Wacker, Steinen (DE)
Assigned to Endress+Hauser SE+Co. KG, Maulburg (DE)
Appl. No. 17/756,327
Filed by Endress+Hauser SE+Co. KG, Maulburg (DE)
PCT Filed Nov. 9, 2020, PCT No. PCT/EP2020/081424
§ 371(c)(1), (2) Date May 23, 2022,
PCT Pub. No. WO2021/099151, PCT Pub. Date May 27, 2021.
Claims priority of application No. 10 2019 131 485.2 (DE), filed on Nov. 21, 2019.
Prior Publication US 2022/0413067 A1, Dec. 29, 2022
Int. Cl. G01R 33/02 (2006.01); G01F 23/296 (2022.01); G01K 7/36 (2006.01); G01N 9/00 (2006.01); G01N 11/16 (2006.01)
CPC G01R 33/02 (2013.01) [G01F 23/2966 (2013.01); G01K 7/36 (2013.01); G01N 9/002 (2013.01); G01N 11/16 (2013.01); G01N 2009/006 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for monitoring a condition of a coil, wherein the coil is part of a device for determining at least one process variable of a medium in a container, the method comprising:
applying an electrical excitation signal to the coil and receiving an electrical reception signal from the coil;
determining a first value for the reception signal at a first predefinable measurement time, wherein the first predefinable measurement time is selected so that it is within a predefinable first time interval in which the reception signal reacts, in the form of a step response, to a sudden change in the excitation signal;
comparing the first value for the reception signal at the first measurement time with a reference value; and
determining a condition indicator for the coil on the basis of the comparison.