FRITSCH PULVERISETTE 5/4 classic line - Manual (Page 49)

Using the additional clamping system, the closed grinding
bowl can also be tensioned and gassed outside of the
device. (See Ä Chapter 7.1.1 ‘Locking the additional
clamping system into place’ on page 44)
7.2.2 Gassing
n Slowly open the inert gas supply.
n Press a thin object (e.g. hex key) onto the top of the ventilation
attachment (e) so that the air can escape from the grinding bowl.
n The inert gas now purges the air from the grinding bowl.
n The duration of purging has to be determined through experimenta-
tion.
It depends on grinding bowl size, filling, and gas supply, among other
factors.
n To end purging, close the inert gas supply and release the ventilation
attachment.
n Screw off the ventilation attachment.
n Remove the gassing hose. To do so, press the lever.
CAUTION!
Only switch on the device when both coupling and ventila-
tion attachment have been removed.
Overpressure may occur during grinding!
7.2.3 Ventilate after grinding
CAUTION!
Always let the bowl cool down before ventilation. Hot gases
and sample material may escape from the bowl during
pressure equalisation, leading to serious burns.
® Use protective gloves when ventilating!
n Screw the ventilation attachment onto the valve.
Each valve can be used for aerating or ventilating.
n For pressure equalisation (of the overpressure occurring because of
grinding), carefully press on the ventilation attachment with a thin
object (e.g. hex key).
n Only now may the grinding bowl tensioning be released.
Accessories
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