Liquid level capacitive sensor - QuickField simulation example
This simulation example of liquid level capacitive sensor is prepared by Dieter Stotz as a part of the webinar Level measurement on liquids, part 2.
How to calculate the vessel potential of a capacitive liquid-level sensor as a function of liquid level?
Answer Typical applications Geometry
Given
Task
Solution
Results
Conduction current density distribution in the liquid.
Engineering question
Generate axisymmetric AC-conduction models for successive liquid levels and calculate the vessel potential for each position.
capacitive level sensors, industrial levelmeters, liquid level instrumentation
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Simulation problem
Problem Type
Axisymmetric problem of AC conduction.
Electric permittivity of liquid ε = 81, electrical conductivity σ = 0.1 S/m.
Electrode potential difference U~ = 2 V, frequency 30 kHz.
Vessel potential versus liquid level in a capacitive level sensor, showing how changing the dielectric-filled height alters the measured electrical response.
The geometry model features rotational symmetry and can be simulated as a 2D axisymmetric problem. In axisymmetric problems the axis of rotation is a horizontal one.
A series of problems with different liquid levels is generated by LabelMover.
Vessel potential is a nonlinear function of the liquid level.
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