US 12,092,507 B2
Method for monitoring condition of vibronic sensor for determining and monitoring process variable of medium in container, involves determining status indicator from comparison measured value for amplitude and frequency with reference value
Kaj Uppenkamp, Wehr (DE); Christian Strittmatter, Rickenbach (DE); Armin Wernet, Rheinfelden (DE); and Sascha D'Angelico, Rümmingen (DE)
Assigned to Endress+Hauser SE+Co. KG, Maulburg (DE)
Appl. No. 17/610,033
Filed by Endress+Hauser SE+Co. KG, Maulburg (DE)
PCT Filed Apr. 8, 2020, PCT No. PCT/EP2020/060038
§ 371(c)(1), (2) Date Nov. 9, 2021,
PCT Pub. No. WO2020/229064, PCT Pub. Date Nov. 19, 2020.
Claims priority of application No. 10 2019 112 866.8 (DE), filed on May 16, 2019.
Prior Publication US 2022/0221324 A1, Jul. 14, 2022
Int. Cl. G01F 25/20 (2022.01); G01F 23/296 (2022.01)
CPC G01F 25/20 (2022.01) [G01F 23/2967 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for monitoring condition of a vibronic sensor for determining and/or monitoring at least one process variable of a medium in a containment and having at least one sensor unit having a mechanically oscillatable unit, the method comprising:
exciting the mechanically oscillatable unit by means of an excitation signal such that mechanical oscillations are executed;
receiving the mechanical oscillations in the form of a received signal;
determining a measured value for amplitude and a measured value for frequency of the received signal;
comparing the measured values for amplitude and frequency with respective reference values for amplitude and frequency; and
ascertaining a condition indicator from the comparison,
wherein when no measured value is ascertainable for amplitude and the measured value for frequency is less than the reference value, such indicates the presence of corrosion and/or abrasion on the oscillatory tines and/or a hard accretion in the region of the membrane.