Metrohm 763 PVC Thermomat Manual - Manual (Page 75)

4 Operation
763 PVC Thermomat
68
2 Insert measuring vessels
• Place the measuring vessel cover 55 fitted with a gas inlet
tube on the measuring vessel 4 4 (see Fig. 4).
• Place the measuring vessel 44 with its cover in one of the
openings provided for it on the 763 PVC Thermomat and
connect the electrode plugs 26 26 on the cover to the corre-
sponding sockets 20 20 on the 763 PVC Thermomat (see Fig. 3).
Prepare reaction vessels
Before the start of a determination the reaction vessels are filled with
the samples and prepared as follows (see Fig. 4):
1 Weighing in the samples
• Weigh out 0.5 g of each of the prepared samples into the
cold reaction vessels 1 1.
According to DIN 53'581, the samples are to be added directly into
the prewarmed reaction vessels inserted in the heating block. Never-
theless, comparative measurements have shown identical results for
sample addition to cold or hot reaction vessels.
2 Mount accessories
• Take the upper rim of the reaction vessel 11 in your hand (e.g.
in the space between thumb and index finger) and rotate the
glass though 360°. This provides the degreased glass with a
thin grease film, without which it is very difficult to remove
the cover from the vessel after the determination.
• Insert an gas inlet tube 32 32 (length = 98 mm) into the reac-
tion vessel cover 22 and fasten it by screwing down the con-
nection nipple 30 30.
• Place the reaction vessel cover 22 on the reaction vessel 1 1.
Rotate the cover so that the gas inlet tube 32 32 is as close as
possible to the vessel wall.
• Fasten the white connecting tubing 33 to the measuring
vessel 44 on to the corresponding connection 31 31 on the reac-
tion vessel cover 2 2.
• Place the prepared reaction vessel 11 into the vessel holder.