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Chapter 5 Maintenance
Page 5-6 MAN 0318
Calibration
Calibration is performed by selecting a calibration point that will match the pH
buffer to be used, and pressing the Measure button. Instructions are present on the
calibration dialogue to give guidance through the process.
1.
Rinse the electrode in deionised water and dab dry with a good quality lens tis-
sue (one that does not shed fibres/lint free).
2.
Open the pH calibration dialogue by selecting Tools-Instrument- MPT-2
Titrator- pH calibration within the Zetasizer Nano software , or by
selecting the pH calibration icon.
3.
Select the first calibration point: press the Add button and enter the calibration
pH required. Press OK . This point will now be added to the calibration point
list.
4.
Repeat the above for all the required calibration points, i.e. pH 4, 7 and 9. The
chosen pH points will show an
alongside. Default pH points will be pH 4
and pH 9 as these are the buffers originally supplied with the pH probe. See
Choosing the buffers when calibrating later in this section for advice on
adding and selecting buffers.
5.
Select the first pH point and place the pH probe into the matching pH buffer,
wait for the
pH probe output (mV) value to stabilise and press the Measure
button. The software will then check that the pH reading is stable before con-
MAN0318-4.0 - MPT-2 Autotitrator-Degasser.book Page 6 Tuesday, September 4, 2012 12:15 PM