Metrohm 806 Exchange Unit - Manual (Page 32)

5.1 Care and upkeep
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806 Exchange Unit
7 Couple the piston rod with the push rod of the drive. The clamp of
the push rod must tightly fit into the opening of the piston rod, see
picture.
8 Carefully push the light protection downwards and tighten in the
thread of the body. Thereby the dosing piston is pressed into the cyl-
inder.
9 Dose manually and move the piston upwards to the limit stop.
5.1.4 Flat stopcock blocked
1 Check whether the stopcock is in dosing position. The switching lever
must be directed to the right.
2 Loosen the flat stopcock out of the holder. Rotate the plate holder to
the left and slightly lift the clip on the side of the holder with a finger
nail or a sharp object. Then the flat stopcock can easily be removed
from the holder.
3 Put the stopcock into a solvent.
with aqueous solutions – hot water
with non-aqueous solutions – suitable solvent (see chapter 8)
with KF reagent - methanol, then water, then methanol.
4 Eventually clean the stopcock with a suitable solvent (see above) in
an ultrasonic bath and let it dry afterwards.
5 When the stopcock can be moved again, it can be inserted back into
the exchange unit, see above.