21
WIKA operating instructions SF
6
gas filling cart, model GFU08
14033074.01 11/2018 EN/DE/FR/ES
EN
6. Commissioning, operation
6.2 Commissioning the vacuum pump (models GFU08-E and GFU08-C)
The vacuum pump is delivered ex works without oil filling. Thus, before the first start-up
of the vacuum pump, it should be filled with the accompanying oil. By unscrewing the oil
mist separator, the accompanying oil can be filled up to the height of the “middle sight
glass” in the vacuum pump which must be standing on the level.
The oil level must not filled beyond the “middle sight glass”. After filling the
oil, screw the oil mist separator back in.
To start the pump, the suction pipe must be opened. For this, remove the
cap (in addition, turn the stopcock to the setting “Flow”).
6.3 Evacuation of a gas compartment before filling it with SF
6
gas (models
GFU08-E and GFU08-C with vacuum pump)
■
Before switching on the vacuum pump, connect the vacuum suction hose to the
gas compartment and make sure that the connection is gas-tight and without leaks.
The gas compartment, filled with air, must not have a higher pressure than the
atmosphere.
■
In accordance with the operating instructions included from the manufacturer, the
vacuum pump must be operationally safe (oil level, power supply).
■
After switching on the vacuum pump, the pressure display will show the negative
pressure range smaller than 0 bar after a few seconds. If the pressure does not drop
below 0 bar, the vacuum pump must be switched off immediately.
→ See chapter 10 “Faults” for this.
■
Seal the gas compartment after the required final pressure has been reached or after
the required pump-off time and make sure that it is gas-tight. Afterwards, switch the
vacuum pump off.
■
After switching off the vacuum pump, there should be no vacuum over a longer
period at the suction joint of the vacuum pump. Dismount the vacuum hose and
ventilate it.
6.4 Preparation of the SF
6
gas filling
6.4.1 Mounting the gas cylinder
CAUTION!
Use only appropriate adapters for the cylinder types to be connected! Risk
of accidents if unsuitable adapters are used.
■
After a successful evacuation, the gas outlet on the SF
6
gas cylinder can be
connected properly and without leakage to the connecting hose of the gas cylinder
on the SF
6
gas filling cart by means of an adapter.
