BUCHI Syncor Polyvap - Manual (Page 20)

Syncore ® Accessories
18 version E
Empty positions
Due to active cooling of the residual volume appendages
on the glasses in the Rack R-6 with cooling of the residual
volume, the rack should never be operated with some of the
glasses empty without first sealing off the empty positions
in the vacuum connection with plastic plugs. The cooling
produces a cool condensation zone for solvents that eva-
porate out of glasses that are filled. Plugging the vacuum
inlets for empty glasses in the vacuum connection renders
such condensation impossible and results in a quicker
evaporation across the positions that are filled.
Glassware
Only the glassware described in this Operation Manual
may be used with the racks with cooling of the residual
volume.
Residual volume
The residual volume in the cooled appendix of the glass
vessel amounts 0.3ml, 1ml and 3ml (see also the Section
on Spare Parts). Under suitable conditions, the residual
volume remains stable for hours.
Example: Glasses R-6 with 0.3ml residual volume
Evaporation of hexane, 200 ml, heating of the rack at
60°C, Vacuum 335 mbar (Boiling Pt. = 40°C). Cooling of
the residual volume at 15°C. The residual volume within the
appendage remains at a minimum of 0.3 - 0.4 ml.
Flushback module
The use of the Flushback module allows to increase the
recovery rates. The module is placed on the rack and con-
nected to a colling source. By cooling the top of the glass
tube, solvent condenses and rinses the glass tube wall. This
prevents the substance to remain on the glass tube wal.
The more you cool the longer the evaporation lasts.
Syncore Polyvap
Crystal Rack R-4, R-6
Rack R-4 or Rack R-6, respectively, allows for the heating
or cooling of 4 or 6 test vessels respectively. Only the glass
vessels described in these Operating Instructions should
be used.
In Rack R-4 and Rack-R6, water is used as the heating
transfer medium between the metal sheath and the test
vessel. The water layer between the sheath and the glass
should surround at least 1/2 of the glass surface. For this
reason, water is added to reach the marks in the sheath.
Only distilled, clean water should be used. If the racks are
not used for a long period, they should be emptied in order
to prevent deposits forming in the metal caps.
Function,putting into operation, operation and maintenace