Method of and an apparatus for measuring ion concentrations in solutions
First Claim
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1. A method of measuring ion concentrations in solutions, comprising:
- using at least two-ion sensitive test electrodes, these having different sensitivities to at least one of the concentration and activity only in relation to the ion or ion mixture to be measured, using at least one common reference electrode which merely sets at least one operating point of the test electrodes, evaluating the output signals of the test electrodes by producing a measurement signal which represents the difference between the output signals and which is essentially independent of the properties of at least one of the reference and test electrodes which are disruptive to measurement; and
dipping at least the two test electrodes directly into the solution which is to be measured.
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Abstract
A method of measuring ion concentrations in solutions comprises using at least two ion sensitive test electrodes in the solution to be measured, the test electrodes having different sensitivities only in respect of the ion or ion mixture to be measured, setting the operating point of the test electrodes by means of at least one common reference electrode, and evaluating the signals of the test electrodes to produce a measurement result essentially independent of the properties of the reference and test electrodes which would interfere with accurate measurement.
The invention also includes apparatus suitable for carrying out the method.
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Citations
17 Claims
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1. A method of measuring ion concentrations in solutions, comprising:
- using at least two-ion sensitive test electrodes, these having different sensitivities to at least one of the concentration and activity only in relation to the ion or ion mixture to be measured, using at least one common reference electrode which merely sets at least one operating point of the test electrodes, evaluating the output signals of the test electrodes by producing a measurement signal which represents the difference between the output signals and which is essentially independent of the properties of at least one of the reference and test electrodes which are disruptive to measurement; and
dipping at least the two test electrodes directly into the solution which is to be measured. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- using at least two-ion sensitive test electrodes, these having different sensitivities to at least one of the concentration and activity only in relation to the ion or ion mixture to be measured, using at least one common reference electrode which merely sets at least one operating point of the test electrodes, evaluating the output signals of the test electrodes by producing a measurement signal which represents the difference between the output signals and which is essentially independent of the properties of at least one of the reference and test electrodes which are disruptive to measurement; and
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16. A method of measuring ion concentration in solutions comprising placing at least two ion sensitive test electrodes having different sensitivities only in respect of the ion or ion mixture to be measured in the solution, setting an operating point of said tests electrodes by means of at least one common reference electrode and evaluating the output signals of said test electrodes to produce a measurement result which represents the difference between the output signals and which is essentially independent of properties of said reference and test electrodes which would interfere with accurate measurement.
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17. An arrangement for measuring ion concentrations in solutions comprising a container for the solution, at least two ion sensitive test electrodes in said container and for producing respective output signals, said test electrodes having different sensitivities only in respect of the ion or ion mixture to be measured, a reference electrode for providing a signal for setting the operating point of the test electrodes and evaluating means fed with the output signals of said test electrodes for producing a measurement result which represents the difference between the output signals and which is essentially independent of properties of said reference electrode and said test electrode which would interfere with accurate measurement.
Specification