Mettler Toledo DO308 Bedienungsanleitung Seite 22

Putting into operation
6.3 Heating a sample to dryness
6.3.1 Introducing sample with the transport assembly
- Set the oven temperature appropriate for the sample. Open the stop cock to
allow purging of the "cold zone" of the sample tube during heating.
- After the set temperature has been reached, close the stop cock to allow gas
purge via the "hot zone" into the titration cell of the connected Karl Fischer
titrator. Wait until a stable drift has been reached.
- Place the aluminium insert into the glass boat and weigh the sample therein.
- Open the stop cock to purge the "cold zone" of the sample tube and remove
the screw cap.
- Insert the sample with the transport assembly into the sample tube, close the
tube with the screw cap and purge the cold zone of the sample tube for ap-
proximately 2...3 minutes.
- Close the stop cock to purge via the hot zone into the titration cell.
- After a stable drift has been reached, start the titration at the titrator and slide
the sample boat to the end of the sample tube. The moisture is then trans-
ferred into the titration cell.
- After completion of the titration open the stop cock. Pull back the sample boat
and allow it to cool before unscrewing the cap.
- Remove the transport assembly and close the sample tube. Leave the stop
cock open.
Sample
18
"Hot zone"
Stop cock closed
Stop cock open
"Cold zone"
METTLER TOLEDO DO308