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Picture 1 Reference electrode and measurement electrode

Actual pH measurement loop consists of three different components, the pH sensor with parts discussed above including temperature sensor, a preamplifier and either analyser or transmitter. This loop can be considered a battery in terms of electrical calculations with positive terminal being the measuring electrode and negative the reference electrode. Once the measuring electrode produces potential out of hydrogen ions it is compared to stable potential of the measuring electrode's liquid [1].

Factors affecting accuracy and performance of glass pH electrodes

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