Metrohm 763 PVC Thermomat Manual - Manual (Page 28)

3.1 Determinations
763 PVC Thermomat
21
5 Prepare measuring vessels
⇒ Clean the used measuring vessels and their covers (details
see section 4.6.3).
⇒ Fill each cleaned measuring vessel 4 4 with 60 mL distilled
water.
⇒ Place the measuring vessel cover 55 fitted with a PTFE tube
27 27 on the measuring vessel 44 (see Fig. 4).
⇒ Place the measuring vessel 44 with its cover 55 in one of the
openings provided for it on the 763 PVC Thermomat and
connect the electrode plug 26 26 on the cover to the corre-
sponding socket 20 20 on the 763 PVC Thermomat.
6 Prepare reaction vessels
⇒ Weigh out 0.5 g PVC into the reaction vessels 1.
⇒ Take the upper rim of the reaction vessel 1 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 into the reaction vessel cover 2
and fasten it by screwing down the connection nipple 30 (see
Fig. 4).
⇒ Place the reaction vessel cover 2 on the reaction vessel 1.
Rotate the cover so that the air inlet tube 32 is as close as
possible to the vessel wall.
⇒ Fasten the white connecting tubing 3 on to the connection 31
of the reaction vessel cover 2.
⇒ Place the prepared reaction vessel into the vessel holder.
7 Enter sample identifiers
⇒ Enter the sample identifiers ID1 and ID2 in the corresponding
fields of the operating area in the control window.