SaM - Capacitive Level Sensor

• So let’s think of a cylinder made of conductive material, which is filled by liquid.
• This is a non-ionic liquid, so it’s like an insulator.
  Ionic liquids have negligible conductivities.
• Inside of which we place a conductive rod.
• We have:
  • $h$ : height of the liquid.
  • $L$ or $l$ : height of the cylinder.
  • $a$ : small area of the rod.
  • $b$ : radius of the cylinder
  • $\epsilon$ : permittivity of the liquid (different permittivity with respect to vacume)
  • ${\epsilon }_0$ : permittivity of vacume
• So it’s like having one capacitance $C_1$ and one other capacitance $C_2$, and these two capacitance are put in parallel.

Instead if we have to measure an ionic liquid, so that conducts, we can:

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