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Fluid composition monitor using electrode pair
(English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

The measurement body comprises two concentric metal tubes, one inner and one outer (3), sepd. by a distance component of electrically insulating material. The two tubes are connected by leads to a vector impedance meter for measuring phase angle. The body is fitted in a section of a tube in which the fluid to be monitored is transported, or, alternatively, inside a tube or tank in which the fluid is stored. The fluid fills the space inside the inner tube and that between it and the outer tube. The ends of the inner tube may be blocked so that only the space between the two tubes is filled with fluid. Thus, a capacitor is formed by the measurement body, and the two tubes constitute its electrodes. When monitoring the compsn. of a fluid, a known high frequency alternating voltage is fed over the two electrodes, and the phase angle between the voltage and the resultant current is measured, it being preferable for the frequency of the voltage or current ot be in the interval of 250 kHz.

Research subject
Industrial Electronics
URN: urn:nbn:se:ltu:diva-36866Local ID: 724a6b40-d873-11db-a1bf-000ea68e967bOAI: diva2:1010313
SE SE8700710, SE458068 (B)
Upprättat; 1988; 20060926 (ysko)Available from: 2016-10-03 Created: 2016-10-03

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