3. Measuring Cells
FlowStar2 LB 514
36
Installation procedure for fingertight screw fitting
Figure 8: Capillary with PEEK "fingertight" screw fitting
Push capillary through the fingertight screw until a piece of it protrudes
at the other end
.
Set screw onto the connecting piece and tighten it slightly.
Push capillary all the way into the screw and the connecting piece.
Fingertighten screw, make sure it is tight and if you detect any leakage,
tighten screw a bit more.
3.4 Cleaning the Measuring Cells
Clean the measuring cells regularly, i.e. between 2 cycles, and flush the
system after the last cycle using a solvent. In case of heavy contamination
the cell has to be decontaminated; if in doubt, replace it.
The measuring cells are cleaned by means of a PE disposable syringe
(2 or 5 ml) as follows:
Unscrew the inlet capillary.
Prepare a coupling so that disposable syringe and measuring cells inlet
can be fitted together accurately. Use a 200 µl pipetting tip (yellow),
and cut it on both ends by 8 mm (see page 5-5).
Fill the syringe, e.g. with H
2
O
2
(or with a detergent solution), place it onto
the syringe, put the syringe (with coupling) against the measuring cell
inlet, and protect the direct vicinity against possible spillage with paper.
Inject the liquid slowly.
Finally, flush the measuring cell with water, connect the inlet capillary
again, and pump the entire liquid out of the system into a waste con-
tainer.
