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5. Electrical capacitance measurement systems
5.1 Measuring principle
If we connect two conductive electrodes immersed in an insulating medium to a source of alternating current, we create a capacitor whose impedance, at a given frequency, determines the intensity of the current. Any change in capacitance, caused by changes in the level of the products between the electrodes, changes the value of the electric current.
With this measurement principle, if satisfactory results are to be obtained, it is essential to always consider the duality of the parameters electrical conductivity and permittivity (dielectric constant) of the controlled medium.
This is, of course, a true level measurement.
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Bibliography
Websites
Online course on level measurement using radar technology :
https://academy-online.krohne.com/elearning/fr/cours/mesure-de-niveau-radar/
Engineer's Garage: level sensors :
...Standards and norms
- Radiation protection – Sealed radioactive sources – General requirements and classification - ISO 2919 - 2012
- Tanks for transporting hazardous materials – Tank service equipment – Fill limiters for liquid petroleum fuels - NF EN 13922 - 2011
The catalog of Iso and Afnor standards can be consulted online on the Afnor website: http://www.afnor.fr
...Regulations
Arrêté du 8 juillet 2003 relatif au contrôle métrologique des récipients-mesures. NOR : INDI0301736A
Decision no. 09.00.110.003.1 of October 21, 2009 relating to calibration resources in the field of static and dynamic liquid measurement.
Arrêté du 24 mars 2009 relatif aux jaugeurs. NOR : ECEI0906617A
Decree no. 2002-460 of April 4, 2002 on the general...
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