Instruction manual

OPERATING_MANUAL_MC20V.DOC 18.03.11 KS Seite 10
2.4. Protective Gas
The connection of inert gas supply is done by a hose with outside diameter 8 mm.
Primary pressure should be 6-8 bars. Regulator on the gas bottle is a pressure
regulator (NEVER use a flow regulator !!!) This armature must be purchased at a
serious dealer for gas bottles. Ask him! To purchase this armature at Indutherm:
difficulty because all countries have different standards in gas bottles.
If only platinum or other non-reactive metals has to be casted: it is in general possible
to use pressurized air.
For standard applications you can use nitrogen gas
For application in Pd 950-alloy it is a must to use good quality argon gas!
This gauge must show bar/PSI
but NOT Liters / Minute
2.5. Vacuum Pump
The vacuum pump should be connected with the supplied tube with an outer
ø of 8 mm. Keep the vacuum tube as short as possible to avoid pressure loss.
Before starting unit: let vacuum pump run for 10-15 minutes to heat-up oil (Inlet
closed). Same after finishing casting: let it run for 10 minutes more (inlet closed).
This is specially important if vacuum pump is running also for Investment Unit!
Water steam/moisture makes a mixture with oil (emulsion) which makes the oil
disable.