Operating TOPwave
54
Concentration should always be carried out with a fully filled rotor (8 vessels for CX 100
or 12 vessels for PM 60 und PL 100).
The sample volume must be nearly equal in all vessels (e.g., 20 ml).
Place the vessels prepared for evaporating into the rotor. Any unused positions must
be sealed with blind s plugs.
Then connect all vessels to the collection vessel.
Close the microwave.
Connect the microwave with the exhausted air hose with the gas scrubber.
Check to make sure that sufficient coolant water is flowing at the gas scrubber (ap-
prox. 0.5 liters/min.)
For evaporation the magnetron temperature must be set to magT < 20 °C in the tempe-
rature program (typical values 5-10 °C). The magnetron temperature is recorded conti-
nuously and is used to control the distillation process. The terminate criterion is met if in
step 5 the magnetron temperature rises by the specified value compared to the tempe-
rature that arose in step 4.
The power specifications for step 4 and must be selected to be identical to obtain an ex-
pedient terminate criterion. In steps 1-4 the microwave energy is not automatically cut
off. The times these steps take depends on the total quantity of fluid and must therefore
be selected in such manner that the temperatures of all samples can stabilize. In step 5
the distillation process is stopped automatically as soon as the terminate criterion is
met. The entire control system is therefore independent of the type of acid.
Excample
Sample loading
Connecting gas scrubber
Starting the microwave
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