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 find capacitance change in liquid level sensors?
Engineering answer Typical applications Geometry
Given
Task
Solution
Results
Conduction current density distribution in the liquid.
Engineering question
Set up an axisymmetric QuickField AC Conduction problem for a liquid level capacitive sensor and evaluate capacitance change from computed field results.
cylindrical capacitors, coaxial electrodes, capacitive displacement sensors
Download
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.
Determine vessel potential as a function of the liquid level.
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.
Related examples