Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device
Patent
1986-01-24
1987-04-07
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Electrolyte properties
Using a conductivity determining device
324 65R, 324443, 204400, G01N 2702
Patent
active
046564276
ABSTRACT:
A liquid conductivity measuring circuit with power-save features 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 adapted 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.
REFERENCES:
patent: 3495164 (1970-02-01), Dauphinee
patent: 3757205 (1973-09-01), Dauphinee
patent: 3906353 (1975-09-01), Murdock
patent: 4118663 (1978-10-01), Barben
patent: 4439693 (1984-03-01), Lucas
patent: 4511845 (1985-04-01), Dauphinee
patent: 4527128 (1985-07-01), Bittner
Eisenzopf Reinhard J.
Solis Jose M.
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