Apparatus and method continuous measurement of the electrical conductivity of liquid media in a dynamic cell
First Claim
1. Device for precise, continuous and dynamic measurement of the electrical resistivity σ
- of a liquid L, at a temperature which may range from low cryogenic temperatures to approximately 2000°
C., characterized in that it includes in combination;
a dynamic measurement cell 2 including at least one conduit 5 of electrically insulating material in which a conductive electrode 6 can slide in an alternating periodic motion of amplitude 1, the lower portion of the conduit 5 being calibrated over a length equal to at least 1, and having a cross section s, said cell 2 being immersed in a crucible 3 containing the liquid L at the constant, and adjusted temperature;
a generator 22 of periodic current of frequency f, connected in series with the cell 2 that it supplies at an effective intensity i;
a device 10 for controlling, adjusting and measuring the amplitude of the displacement 1 of each electrode 6;
a means 8 for measuring and adjusting the depth of immersion of each electrode or group of electrode 6 in the liquid L;
a device for adjusting and measuring the speed of displacement Δ
1/Δ
t of the electrode 6 in the conduit 5;
a means of measuring the variation in ohmic resistance R of the cell as a function of the displacement of the electrode 6;
Δ
R/Δ
1 based on the measurement of the voltage u at the terminals of the cell and of the effective intensity i of the current passing through it, by synchronous, in-phase detection of u and i;
the value of the conductivity o of the liquid L then being equal to;
##EQU2## where n is the number of electrodes 6 of the cell 2.
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Accused Products
Abstract
An apparatus for providing a precise, continuous, and dynamic measurement of the electrical resistivity of a liquid medium. A dynamic measurement cell is provided with at least one conduit of electrically insulating material in which a conductive electrode slides with a motion of given amplitude. The lower portion of the conduit is calibrated over a length equal to at least the given amplitude, and has a known cross-section. The cell is immersed in a crucible containing the liquid medium for test at constant temperature to monitor various electric parameters. The monitoring system provides devices for controlling, adjusting, and measuring the amplitude and speed of the displacement of the electrode; measuring and adjusting the depth of immersion of the electrodes; and, measuring the variation, in ohmic resistance, of the cell as a function of the displacement of the electrodes. The conductivity is determined by an equation proportional to the ratio of the change in amplitude to the change in resistance.
20 Citations
18 Claims
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1. Device for precise, continuous and dynamic measurement of the electrical resistivity σ
- of a liquid L, at a temperature which may range from low cryogenic temperatures to approximately 2000°
C., characterized in that it includes in combination;a dynamic measurement cell 2 including at least one conduit 5 of electrically insulating material in which a conductive electrode 6 can slide in an alternating periodic motion of amplitude 1, the lower portion of the conduit 5 being calibrated over a length equal to at least 1, and having a cross section s, said cell 2 being immersed in a crucible 3 containing the liquid L at the constant, and adjusted temperature; a generator 22 of periodic current of frequency f, connected in series with the cell 2 that it supplies at an effective intensity i; a device 10 for controlling, adjusting and measuring the amplitude of the displacement 1 of each electrode 6; a means 8 for measuring and adjusting the depth of immersion of each electrode or group of electrode 6 in the liquid L; a device for adjusting and measuring the speed of displacement Δ
1/Δ
t of the electrode 6 in the conduit 5;a means of measuring the variation in ohmic resistance R of the cell as a function of the displacement of the electrode 6;
Δ
R/Δ
1 based on the measurement of the voltage u at the terminals of the cell and of the effective intensity i of the current passing through it, by synchronous, in-phase detection of u and i;the value of the conductivity o of the liquid L then being equal to;
##EQU2## where n is the number of electrodes 6 of the cell 2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- of a liquid L, at a temperature which may range from low cryogenic temperatures to approximately 2000°
Specification