Agilent Technologies 9191610, User Manual

Page: 51 / 98

Installation Procedure
Use
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VacIon Plus 300 pumps User Manual / 87-900-103-01 (H) 51/98
The VacIon Plus pump can be installed in any position. For
convenience, a pump is usually mounted vertically with the inlet up.
For mounting other than vertical, the pump should be supported
using the mounting feet at the bottom of the pump.
For detailed information about the pump installation, see the
appendix “Technical Information”.
Use
All the instructions for the correct use of the VacIon Plus pumps are
contained in the control unit manual. Read the manual carefully
before using the pump. Rough pumping down to 1x10
-4 Torr (mbar) is
recommended for the most rapid starting. Roughing with an oil-
sealed mechanical pump is not desirable, but when used, a trap in
the roughing line is recommended to reduce pressure due to water
vapor and oils from the mechanical pump. Be careful to minimize the
time that this pump is open to the system and ion pump, since
mechanical pump vapors will start diffusing into the system at
pressures below 1x10
-1 Torr (mbar) and cause contamination. In
systems where oils must be completely eliminated, turbopump
roughing pumps should be used. Hygroscopic deposits and hydrogen
absorption into titanium may cause starting times to increase with
age. During exposure to air, the deposits of titanium compound
absorb water vapor. In subsequent start ups, pump heating causes
release of the water vapor and some previously pumped hydrogen;
thus, the starting time may be lengthened.