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Proceedings Paper

High-frequency magnetic field probe for determination of interface levels in separation tanks
Author(s): Erling Hammer; Eirik Abro; Emil Cimpan; Guanqun Yan
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Paper Abstract

There are many principles for interface level detection in separation tanks based on capacitance, ultra sound, microwave, nuclear radiation etc. These principles work well in many situations, in others they fail. The high frequency magnetic field principle works in most of the situations that will occur in separation tanks for crude oils for detection of the clean water level, the layers of water continuous water/oil emulsion and the oil continuous oil/water emulsion, the oil level, the thickness of the foam layer and the gas. When a coil is dipped into a fluid its electrical impedance will be dependent on the characteristics of the fluid. If the material is electrical conductive the impedance of the coil will be reduced due to the eddy currents induced in the material, setting up a magnetic field directed against the field generated by the coil. The inductance will increase but still remain low also in the water continuous water/oil emulsion zone, but will rapidly increase in the oil continuous oil/water emulsion zone. In pure crude oil the inductance will be high and even higher in gas. The coil inductance is measured by connecting the coil to a LC-oscillator.

Paper Details

Date Published: 2 February 2001
PDF: 6 pages
Proc. SPIE 4188, Process Imaging for Automatic Control, (2 February 2001); doi: 10.1117/12.417177
Show Author Affiliations
Erling Hammer, Univ. of Bergen (Norway)
Eirik Abro, Hammer AS (Norway)
Emil Cimpan, Univ. of Bergen (Norway)
Guanqun Yan, Univ. of Bergen (Norway)

Published in SPIE Proceedings Vol. 4188:
Process Imaging for Automatic Control
Hugh McCann; David M. Scott, Editor(s)

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