Malvern MPT-2, User Manual, Page: 67 / 85

Maintenance Chapter 5
MPT-2 & Degasser Page 5-11
Vacuum degasser maintenance
To experience long and trouble-free performance with the Vacuum degasser, it is
recommended that both routine and preventive maintenance procedures be regu-
larly performed.
Shutdown
There are two types of shutdown procedures: long-term and short-term.
Short-term shutdown (Overnight and weekends)
Observe all precautions pertaining to hazardous titrants and/or those titrants that
form harmful deposits or by-products.

Remove harmful titrants from the degasser and other instruments in the Zeta-
sizer system.
Caution!
Damage caused by precipitating buffer salts in capillary tubing, or damage
resulting from this condition, is specifically excluded from warranty.

Flush buffer salts from the system with water by priming the titrator with dem-
ineralised water in the titrant container. Evaporation leaves salt crystals that
may form harmful deposits. Remove chloroform or titrants that can decom-
pose to form hydrochloric acid from the system.

For weekend storage flush 60/40% MeOH/Water through the degasser, then
turn off the degasser.
Long-term shutdown and storage

Follow the first two Short-term Shutdown procedural steps above.

Remove the column and direct the pump output tubing to a beaker. Flush the
degasser, first with water and then with Isopropanol.

Turn off the degasser. Then disconnect the tubing between the degasser and
titrant containers, and the degasser and the titrator. Plug all of the ports on the
degasser.

Store the degasser in a clean, dry location.

Before using the degasser, completely purge it with the correct titrant before
reconnecting the titrator and restarting the system.
MAN0318-4.0 - MPT-2 Autotitrator-Degasser.book Page 11 Tuesday, September 4, 2012 12:15 PM