Malvern MPT-2, User Manual, Page: 44 / 85

Chapter 3 Software and Control
Page 3-10 MAN 0318
For details of the standard measurement sequence refer to the Zetasizer Nano
manual for details.
The actual measurement sequence will depend upon the measurement being per-
formed, though in general an autotitration measurement sequence will be as fol-
lows:
1.
With the sample container and the cell inserted, Start is pressed. The cell is
first checked to identify the cell type fitted, and that it agrees with that selected
in the SOP. Once identified the measurement sequence continues automati-
cally. The pump and stirrer will be set to the values requested in the SOP and
the pH value will be read.
2.
The titration will now start at the value specified with in the SOP. This will
either be the "
Start " value or " ..at current value ".
3.
If Start at current value was selected the system will immediately go into
performing a measurement. If this was not selected the unit will add titrants to
the sample to bring it to the start value specified.
4.
Once the start value has been obtained a measurement will be performed. The
sample will recirculate if specified.
5.
With the first measurement complete more titrants will be added to the sample
to bring it to the second measurement point, where another measurement will
be performed.
6.
The measurement sequence continues until all points have been measured.
7.
The measurement sequence will now complete and add a result to the current
open file.
The progress meter indicates the measurement progress during each stage.
Note
If Close is pressed while a measurement is in progress the screen will
close, but only the data for the currently performed titration measurement
will be lost. The data from all completed titration measurements will be
preserved; i.e. if 15 individual measurements are to be performed for one
complete titration, and the titration is closed on measurement 10; the first
nine measurements data will be preserved, but the 10th measurement data
will be lost.
For Zeta potential measurements, when the titration measurement is
closed before all individual measurements are completed, no isolelectric
point will be generated.
MAN0318-4.0 - MPT-2 Autotitrator-Degasser.book Page 10 Tuesday, September 4, 2012 12:15 PM