triOS TpH - Measurement Influences and Compensation

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D01-068en201913 Manual TpH
TpH // Calibration
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5.2 Measurement Properties
5.2.1 Inuences on the Measurement
• The pH measurement depends on the following parameters:
• High temperatures of the measuring medium accelerate the ageing of the electrode.
• Note the immersion depth: a too shallow immersion depth can lead to uctuating measured values.
• Air bubbles on the sensor can cause measurement errors.
• Alkali error: at pH values above pH12, alkali ions (Li+, Na+) can cause lower pH values to be displayed, as the
alkaliions are detected in addition to the H+ ions.
• Flow can inuence the measured value.
5.2.2 Temperature Compensation
Temperature compensation is performed automatically by the integrated temperature sensor (Pt1000).