BUCHI Syncor Polyvap - Manual (Page 18)

Syncore ® Accessories
16 version E
Sample volume (SV)
Rack Minimum SV Optimum SV
R-4 50 ml 500 ml
R-4 with residual vol. 50 ml 500 ml
R-6 25 ml 250 ml
R-6 with residual vol. 25 ml 250 ml
R-12 10 ml 120 ml
R-12 with residual vol. 10 ml 120 ml
R-24 5 ml 30 ml
R-48 1 ml 20 ml
R-96 0.5 ml 10 ml
Table 1: Sample volume
Syncore Analyst
Rack Analyst with cooling of residual volume
The Racks with cooling of the residual volume lets you
cool a glass appendix actively without changing the heat
exchange into the glass outside the appendage.
Thus it becomes possible to evaporate solvents from the
appendage glass until the final volume has been reached
within the glass appendix. Due to the active cooling, any
solvents remaining in the appendage along with the pro-
ducts being investigated in the analysis will no longer eva-
porate out. The cooling temperature selected for the glass
appendage and the vacuum applied must be coordinated
so that the temperature will not drop below the boiling point
of the solvent.
Example: Using hexane as the solvent
Cooling of the appendix with water, 15 °C,
pressure = 335 mbar/Boiling point of the hexane = 40°C.
Too low a vacuum or too high a temperature of the coo-
ling medium may result in a complete evaporation of the
residual volume.
For a rough guide for the pressure to be selected to reduce
the boiling point to 40 °C, refer to the Table of solvents in
the Appendix.
Filling with water
In the Analyst racks with cooling of the residual volume,
water is used as the medium of heat transfer between the
glass shell and the sample tube.
The layer of water between the shell and the tube should
surround at least 2/3 of the glass in the shell. To ensure this,
fill of water into the shell up to the marking a.
Figure 18: Water in the Rack R-6 with cooling of the residual volume
Function,putting into operation, operation and maintenace