G - Physics – 01 – N
Patent
G - Physics
01
N
324/28.2
G01N 27/30 (2006.01) G01N 27/403 (2006.01) G01N 27/414 (2006.01)
Patent
CA 1267933
ABSTRACT There is provided a system for measuring a selected ion in a solution so as to avoid noise pickup from AC parasitic currents and measurement offset from DC parasitic currents, such as are frequently found in pH measurements on low conductivity grounded solutions like high purity water. the system in one form has an operational amplifier with an ion selective electrode connected to its inverting input, a counter electrode connected to its output, and circuit common connected to the non-inverting input, so that the potential of the ion selective electrode is continuously driven to circuit common. The reference electrode of the system is connected to a high impedance measuring circuit for measuring the voltage level of that electrode with reference to circuit common as a measure of the concen- tration of the selected ion in the solution.
557949
Connery James G.
Shaffer Earl W. Jr.
Borden Ladner Gervais Llp
General Signal Corporation
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