VACUUBRAND PC 3012 VARIO plastic housing - Manual (Page 46)

page 46 of 129
wise dangerous mixtures. If in doubt, use inert gas.
To reduce condensation in the pump, do not pump vapor
before the pump has reached its operating temperature.
Open the gas ballast valve when pumping condensable
vapors. Turn gas ballast cap to open valve.
For condensable vapors (water vapor, sol-
vents, etc.):
- The gas ballast valve is open if the arrow on
the gas ballast cap is pointing towards the
labelling ”GB”.
MD 12C/MV 10C VARIO-B and PC 301x
VARIO: The gas ballast valve is open if
the arrow on the gas ballast cap is pointing
away from the pump‘s inlet.
- With gas ballast valve open, the ultimate vacuum will
be reduced.
- Use inert gas for gas ballast to avoid the formation of
explosive mixtures. A special adapter fitting is needed
to connect an inert gas supply line (see “Accessories”,
pg. 92). This adapter replaces the standard gas bal-
last cap and allows for an inert gas line to be connect-
ed via a KF DN 16 small flange at a maximum supply
pressure of 17.5 psi (1.2 bar) absolute.
- Close the gas ballast valve by turning the cap 180°.
In case of low boiling solvents (when the formation of
condensate is unlikely), the use of gas ballast might be
unnecessary. Operating the pump without gas ballast in-
creases the solvent recovery rate at the exhaust waste
vapor condenser.
Important notes concerning the operation of
the exhaust waste vapor condenser
➨
Connect the exhaust to a suitable treatment system to
prevent the discharge of dangerous gases and vapors
to the surrounding atmosphere.
NOTICE
gas ballast (9)
(open)