VACUUBRAND MD 1C VARIO-SP - Manual (Page 51)

page 51 of 87
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Air and pumped media might react inside the pump or
at the outlet of the pump and form hazardous or explo-
sive mixtures, when you use air rather than inert gas
for the gas ballast. This constitutes a risk of significant
damage to equipment and/or facilities, a risk of per-
sonal injury or even loss of life.
+
Make sure that air/gas intake through the gas ballast
valve can never lead to hazardous, explosive or other-
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.
NOTICE
gas ballast
(open)
For condensable vapors (water vapor, sol-
vents, etc.):
- The gas ballast valve is open if the arrow
on the gas ballast cap is pointing away from
the pump ( MD 1C / MD 1C VARIO-SP), re-
spectively towards the pump ( MD 1C + AK
+ EK) or away from the inlet (MZ 1C) (see
figures).
- With gas ballast valve open, the ultimate
vacuum will be reduced.
- Use inert gas for gas ballast to avoid the
formation of explosive mixtures. Attention:
maximum supply pressure of inert gas: 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 for-
mation of condensate is unlikely), the use of
gas ballast might be unnecessary. Operating
the pump without gas ballast increases the
solvent recovery rate at the exhaust waste va-
por condenser (EK).
gas ballast (open)
MD 1C + AK + EK
MD 1C / MD 1C VARIO-SP
gas ballast
(open)
MZ 1C