Metrohm 806 Exchange Unit - Manual (Page 30)

5.1 Care and upkeep
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806 Exchange Unit
5 Remove all tubings.
6 Unscrew and remove the cylinder unit with light protection or the
thermostat casing. If necessary for loosening the light protection, use
the 6.2739.010 key (standard equipment of the dosing device or
titrator) with the insert (6.2739.030).
7 Remove the cylinder holder with cylinder out of the light protection.
Press above on the screw connector.
8 Remove the holder of the glass cylinder upwards.
9 Thoroughly empty the cylinder with the 6.2739.010 key and carefully
remove the piston.
5.1.2 Cleaning the cylinder and piston
Proceed as follows:
1 Check the leak-tightness of the dosing piston and cylinder.
If there is liquid under the piston, the dosing cylinder is not or not
thoroughly greased. Inspect the dosing piston for deformations or
damage to the sealing lips. The piston and the cylinder must be
replaced in the event that any changes are discovered.
2 Clean the dosing cylinder and piston with a liquid cleaning agent.
Do not use any abrasive cleaning powder which could scratch the
cylinder.
3 Afterwards, rinse the individual parts with plenty of deionised (or dis-
tilled) water.
4 Degreasing the piston and the glass cylinder is part of the cleaning
procedure. Use a suitable cleaning agent or solvent and eventually an
ultrasonic bath. Note the recommendations of the cleaning agent
manufacturer.
5 Slightly grease the piston with paraffin grease (6.2803.010) on the
sides. Wipe off the edge of the piston to avoid that the reagent will
be in contact with the grease. Wipe off excess grease with a soft,
lint-free cloth. Do not grease the piston for pipettings.