IKA A11 basic, Руководство по эксплуатации

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14
Accessories
A 11.1 Beater 1.4034) A 11.5 Grinding container 80 ml
A 11.2 Cutting blade (1.4112) A 11.6 Double beater
A 11.3 Beater (1.4112) A 11.7 Filling funnel
A 11.4 Grinding container 250 ml
Note on grinding beaker A 11.5:
Grinding cup made of Tefzel (ETFE). This fluorine plastic (similar to Teflon) possesses
excellent resistance to chemicals and is temperature-resistant from -200°C to +150°C
(ideal for direct cooling with liquid nitrogen).
Color and structure flaws on the outside of the beaker are due to manufacturing
and do not affect the quality of the beaker.
The following instructions must be observed when using the large grinding
container A 11.4 (effective volume 250 ml):
Use double beater A 11.6 for crushing in grinding beaker A 11.4.
The double beater is screwed onto the drive shaft. Hold the drive shaft in place
using a single head wrench a/f 7. Using another single head wrench a/f 7, which is
attached to the two flats of the double beater shaft, screw the double beater until
it is hand - tight.
Please ensure that the off - drive shaft in the thread area is free from dust and mill
feed deposits.
Filling height:
The maximum filling height, shown in figure 5, must not be exceeded (about 20
mm below the stainless steel upper edge). Otherwise the drive may overheat.
Furthermore, good grinding results cannot be expected (a wide range of granularity).
What has been said before also applies here: (for example, only 50 - 80% of
the normally filling quantity) are reduced more quickly, the granularity of the final
product is finer, the range of granularity is smaller and the heating up of the
grinding material is reduced.
Grinding process:
As the double beater is already immersed in the mill feed when the grinding beaker
is being screwed on, it is important that the sample is well shredded (maximum
particle size ø 7 mm) so that the grinding beaker can be screwed on properly.
The hardness of the feed product must not exceed 3 Mohs (medium hardness,
e.g. calcite), otherwise this will put too much strain on the beater, causing it to
wear out quickly.
When you switch on the appliance at the On/Off button, the drive will be pushed
down slowly (see section on starting up). Once the grinding process is complete
(usually after approx. 30 seconds), raise the drive and switch off the appliance at
the On/Off button.
Wait until the motor stops before unscrewing the grinding
beaker.
Do not use liquid nitrogen to cool the sample in grinding beaker A 11.4. You can
use dry ice for cooling purposes, however, please ensure that the cooled mill feed
does not clump together (this is likely to happen with moist mill feed in particular).
Note: If you do not adhere to the maximum fill level and maximum mill feed
hardness, the high starting torque of the grinding beaker may cause the grinding
beaker to open by up to half a revolution and the analytical mill will switch off
automatically.
CAUTION