BUCHI Extraction System B-811 LSV - Manual (Page 42)

6 Operation
42 B-811 Operation Manual, Version G
6 .9 Optical sensor
1
1 cm
2
The optical sensor a detects the solvent level. In order to achieve the
optimum extraction efficiency, the solvent level should be about 1 cm
above the sample b. The solvent should cover the sample during the
extraction process.
Fig. 6.3: Adjustment of the optical sensor
6 .10 Handling the sample/sample holder
The sample holder can handle paper thimbles of various sizes.
The corresponding glass holders are listed in the accessories
and spare parts list.
To fasten the sample tube, push the paper thimble into the glass
holder. The notches must be at the top.
By turning the glass holder one half turn on the PTFE holder, the
sample is connected.
The glass sample tubes are connected the same way.
Fig. 6.4: Sample handling
The condensers can be lowered by pushing them down with
both hands as shown on the picture.
The system can be closed by turning the condensers clockwise.
Fig. 6.5: Closing the system for extraction