Introducing Sample Via The Tapered Joint - Mettler Toledo DO307 Mode D'emploi

5.3.2 Introducing sample via the tapered joint

If you add your sample via the tapered joint, proceed as follows:
– Open the stop cock to purge the "cold zone" of the sample tube.
– Weigh the sample (syringe or weighing boat) and either inject it through the silicon stopper (sep-
tum) or take out the stopper and add the sample to a sample boat positioned below the inlet.
Notes
1. You can heat several samples in the same aluminum insert to dryness if the sample residues do
not have an adverse effect on the subsequent determinations.
2. The oven temperature should be as high as possible to liberate moisture quickly from the sample.
However, decomposition, vaporization or sublimation of the sample should be avoided. Heating
temperatures for several samples are listed in Section 11.
DO307
METTLER TOLEDO
– 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 transferred 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.
Putting into operation
11