Malvern MPT-2, User Manual, Page: 30 / 85

Chapter 2 Connection and accessory preparation
Page 2-8 MAN 0318
Caution!
The pH probe will require special care. Never allow the pH probe to dry
out. It is important to read the section on the care of the pH probe in
Chapter 5 .
Filling and changing the titrant containers
The three titrant containers are typically filled with acid, base, salt, or other addi-
tives. For most applications all that is required is to check that there is enough
titrant in the containers and re-fill if necessary.
Alternatively, if different titrants are continually being used, one of the titrant con-
tainers may need to be changed prior to the measurement.
Always consult the Materials Safety Data Sheets for any titrant being used for infor-
mation on safe handling.
Changing and Re-filling the containers
The titrant containers will hold up to 25ml of titrant. When the level reaches
approximately 5ml, it is recommended to re-fill the container. To refill:

Remove the titrant container by lifting the container cover up and sliding out
the container.

Dispose of the remainder of the titrant and rinse the container.

Prepare 25ml of titrant to the correct concentration (see A note on titrant
concentration later in this section).

Add the titrant to the container.

Re-fit the container. Lift the container cover up and slide the container in to
the empty holder position. Close the cover ensuring all containers are fitted
correctly into the cover.

Prime the titrant tubing using the Manual control dialogue, as described
below.
Note
If changing the titrant type used, it is important to clean the tubing and
containers if re-using. Refer to the
Maintenance
chapter for details. Also
change the titrant settings in the SOP as appropriate for the new titrant, i.e.
name, type, concentration.
MAN0318-4.0 - MPT-2 Autotitrator-Degasser.book Page 8 Tuesday, September 4, 2012 12:15 PM