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Pyro Workbench

Salinity (g/L)

The pH sensors show a small cross sensitivity to the ionic strength/ salinity [g/l] of the medium. To compensate for this effect, the ionic strength/ salinity [g/l] can be entered in the sensor settings and during a pH calibration (the ionic strength can differ between the calibration buffer and the measurement medium). For processes in which the ionic strength changes strongly during an experiment, it is recommended to update the settings and perform a new calibration in order to acquire very accurate results. In the graph below, the cross sensitivity of the pH measurement to the salinity of the medium is shown. Between 5 and 35 g/l NaCl, this effect produces an error in pH of roughly 2/100 for this exemplary experiment. This effect can slightly differ for the different pH sensors and the respective measured pH and environmental conditions.