P2 value
* Only when pH parameter is selected
6.1.3 pH Sensor Calibration
The calibration procedure is necessary to standardise the sensor sensitivity.
The double point calibration gives the maximum accuracy because it allows to set both the slope and the
offset of the curve giving displayed pH value as a function of the mV from the probe (sensitivity), pH = f (mV).
The first point can be calibrated by 7 pH buffer solution (0mV) and the second point can be calibrated by 4pH
buffer solution.
6.1.3.1 Double point calibration
The calibration procedure involves a series of operation on the pH probe and the transmitter. The following
description explains indicates step by step the calibration procedure.
To operate the calibration the following material is necessary:
- two plastic or glass beakers
- standard buffer solution, pH 7 and pH 4 or other, (see paragraph 6.1.3)
- de-mineralised water
- a thermometer
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