G - Physics – 01 – R
Patent
G - Physics
01
R
324/45
G01R 27/22 (2006.01) G01N 27/06 (2006.01) G01N 27/07 (2006.01)
Patent
CA 1227247
ABSTRACT OF THE DISCLOSURE A liquid conductivity measuring circuit is described for use with a four electrode conductivity cell having two potential electrodes and two current electrodes positioned in the cell in spaced relation in a particular sequence with a first operational amplifier having its output connected and its inputs connected via an isolating capacitor and a buffer amplifier and a voltage setting resistance to a source of square-wave voltage, a second operational amplifier having its inputs connected to ground and via an isolating capacitor and its output connected to a reference resistance such as to control the current through the reference resistor to maintain one electrode at a constant potential, readout means being ad- aped to measure, on initiation of a single or small number of square-wave voltage cycles in a period short enough that no significant change of polarization of the potential electrodes can occur, the voltage between the positive and the negative half cycles or the change from zero to either half cycle of the voltage across the resistor, the measurement being a function of the current through the reference resistor and conductivity cell and therefore a measure of the conductivity of the liquid in or passing through the cell.
473595
Dauphinee Thomas M.
R. William Wray & Associates
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