Malvern MPT-2, User Manual, Page: 34 / 85

Chapter 2 Connection and accessory preparation
Page 2-12 MAN 0318

Select the Fill tab.

Select the cycles required and press the Fill button(s) to begin the operation.
Each cycle will pump the volume of the sample tubing and cell.

The pump will circulate the sample through the sample tubing and cell until
the number of cycles has been completed or the
Fill button is pressed a second
time. Use the pump and stirrer controls to adjust the pump and stirrer speeds
during the filling - see the note below.

Before starting the titration check that this procedure has eliminated all bub-
bles from the cell.
Note
Filling the cell should be performed at a lower speed than during a normal
titration i.e. 40% of normal speed. This to prevent the introduction of bub-
bles into the tubing which will affect the measurement result, especially
when performing a Zeta measurement. If bubbles are present, invert the
cell while still pumping and tap it lightly to dislodge them.
Preparation summary
In summary the following operations should have been done before continuing
and making a measurement.

Install and connect the titrator and degasser, as described.

Verify that plugs are installed in any unused ports.

Select and fill each titrant container with the titrant(s) used for the analysis.

Prime the titrant tubes:

Calibrate the pH probe.

Prepare the sample in the container.

Fill the cell used in the Zetasizer Nano.

Allow the system to equilibrate for 5-10 minutes.
Note
Always shutdown the instrument when not performing any degassing.
Refer to the Maintenance chapter for instructions.
MAN0318-4.0 - MPT-2 Autotitrator-Degasser.book Page 12 Tuesday, September 4, 2012 12:15 PM