Metrohm 914 pH / Conductometer - Manual (Page 60)

4.8 pH measurement
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pH Meter/Conductometer
4.8 pH measurement
This chapter describes the required steps to carry out a simple pH mea-
surement with calibration. The description is limited to only the indispen-
sable steps and will enable you to carry out first measurements with the
instrument directly.
4.8.1 pH electrode calibration
NOTE
Measuring channel selection
In order to perform the calibration, you have to select the correspond-
ing measuring channel in the main dialog.
You cannot perform a calibration in the two-channel view in the main
dialog.
pH calibration
By default, the calibration parameters are set for calibration with two
Metrohm buffer solutions (see Chapter 4.7.1, page 38). If you would like
to use other buffers, you have to select the corresponding buffer type and
the number of buffer solutions.
If the Report selection dialog is set to on in the Calibration param.
menu dialog, then the calibration data will be output immediately.
1 Starting the calibration with the first buffer solution
￭ Start the calibration with the key.
￭ Rinse the pH electrode with water and immerse it in the first buf-
fer solution and then confirm with the key.
￭ The calibration temperature is measured with the connected tem-
perature sensor and added to the calibration data.
If no temperature sensor is connected, then the temperature has
to be entered manually.
￭ The first buffer solution is measured.
2 Continuing the calibration with second buffer solution
￭ Remove the pH electrode from the first buffer solution and rinse
with water.