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 Home >> Diagrams / Schematics >>  Test & Measurement  >>  Sensors / detectors  >>  Capacitive water level sensor

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Schematic/Diagram Capacitive water level sensor
Copyright: Handbook of modern sensors, physics, designs and applications.
Description: Capacitive sensor for liquid level measurement implemented with two copper tubes of different diameter mounted as shown in the picture.
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Added on: September 01 2009
Posted by: admin
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Comment By admin
September 01 2009 		Coaxial type capacitive sensor, with two copper tubes of different diameters, placed as shown in the drawing.
The capacitance is given by the following formula:

C=((2*pi*E0)/(ln(b/a)))(H-h (1-k))

where:
- E0: is epsilon zero (vacuum dielectric constant)
- B: is the inside diameter of the outer tube
- A: is the outer diameter of the inner tube
- K: is the dielectric constant of water, which unfortunately varies with temperature.

At 25°C is about 79 with a variation from 84 to 68 between 0°C and 100°C.

Related links:
Capacitor.



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