G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 27/02 (2006.01) G01N 27/06 (2006.01) G01N 27/07 (2006.01) G01N 27/22 (2006.01) G01N 33/03 (2006.01) G01N 33/28 (2006.01)
Patent
CA 2324823
A plug for insertion through the wall of a vessel filled with fluid to be monitored has an extension immersed in the fluid which has a pair of wire electrodes helically wound thereon in spaced arrangement. The electrodes are wound at a uniform pitch in one embodiment and wound with regions of closely and widely spaced pitches in another embodiment. In a third embodiment, the electrodes are helically wound in spaced parallel arrangement at a pitch greater than the spacing of the pair. A thermistor is disposed on the extension for providing a fluid temperature signal. The electrodes are excited sequentially by a low voltage at a fractional Hertzian (low) frequency and a Hertzian (high) frequency and the current and temperature are measured. The impedance and differential impedance are computed from the measured currents. From stored values of the differential impedance as a function of temperature for various known fluid conditions, the condition of the fluid is determined; and, if greater than a predetermined threshold, an alarm is activated and/or the fluid condition displayed.
Bauer Robert Alexander
Hirthe Richard W.
Polczynski Mark Henry
Rops Paul Gregory
Seitz Martin A.
Borden Ladner Gervais Llp
Corporation Eaton
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