Malvern MPT-2, User Manual, Page: 41 / 85

Software and Control Chapter 3
MPT-2 & Degasser Page 3-7
When using the large-volume containers the displacement ring should be placed
at the bottom. The displacement ring will displace the small initial sample upwards,
within the centre of the container, and towards the titrant and sample tubes. This
minimises the amount of sample necessary to start the dilution, and ensures the
magnetic stirrer is positioned correctly. The sloping top of the ring guides the tubes
into the centre of the container, whilst also preventing any sample from resting on
the top of the ring.
The displacement ring will also as act as a weight to keep the container in place
when resting on the magnetic stirrer.
A message will appear to indicate that both the sample and titrant containers used
must be the large volume type.
Titration - Sequence
This dialogue enables the titration measurement details to be selected, such as the
number of points, the range of the titration and the equilibration time. Depending
upon the titration type selected - pH, dilution or additive - the dialogue will alter
accordingly. The same format will be used, with generally just the text and titration
units altered to reflect the titration chosen. The dialogue shown is for a pH titra-
tion.
MAN0318-4.0 - MPT-2 Autotitrator-Degasser.book Page 7 Tuesday, September 4, 2012 12:15 PM