EXTERNAL SENSOR FOR MEASURING A CONCENTRATION OF AN ION

The present disclosure relates to a sensor for measuring a concentration of an ion dissolved in a measuring solution, comprising a plurality of ion-selective electrodes 3 each having a sensitive surface for contact with the measuring solution, wherein the electrodes 3 comprise consumed and unconsumed electrodes, a reference electrode 7 for contact with the measuring solution, wherein a measured value of an electrical voltage between one of the unconsumed electrodes and the reference electrode is a measure of the concentration of the ion dissolved in the measuring solution, and a measuring transducer for determining the measured value of the voltage and for converting the measured value into a concentration of the ion. The measuring transducer has a switching unit to activate an unconsumedelectrode and to deactivate all other electrodes, and the sensitive surfaces of unconsumed electrodes each have a cover covering the sensitive surface against the measuring solution in a medium-tightmanner. 本发明涉及用于测量离子浓度的外部传感