PH probe Hamilton Bonaduz

Stable reference systems are the heart of reliably functioning, long-lasting electrodes. In pH measurement up till now, the user was not spared the need for frequent calibration. The reason for this lies in shifting reference potentials due to chloride loss in the reference electrolyte. However, contaminated and partially clogged diaphragms also contribute considerably to changing properties in pH electrodes, which can only be resolved with a fresh calibration. For pH measurements where a very high degree of accuracy is required, it should therefore be sufficient if the pH sensor is calibrated just before measuring. But in industrial applications - especially in the case of online pH measurement - this is possible only with a great deal of effort, if at all. What is even worse: even if a calibration with certified pH buffers is correctly carried out, the very next measurement will not necessarily be accurate! Depending on the age of the electrode or, more precisely, the state of the diaphragm and the chloride content in the reference electrolyte, different diffusion potentials may occur in buffers and measurement medium. Technically speaking, it is impossible to eliminate this source of error entirely, but with pHeasy technology it is possible to detect it online!
Hamilton, with its pH glasses and the ingenious inner buffer, has built true long term stability into pHeasy electrodes.

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