Metrohm 807 Dosing Unit - Manual (Page 15)

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2 Construction of the 807 Dosing Unit
807 Dosing Unit
￭￭￭￭￭￭￭￭ 7
3 Housing
With data chip, coding magnets, locking
button and specifications concerning the
dosing unit.
Material: PETG or PVDF 4 Centering tube
Is actuated by Dosino and rotates the entire
inner cylinder unit, together with dosing cyl-
inder, cylinder base and the integrated valve
disc.
Material: PETG or PVDF
5 Spring clip
Material: PETG or PVDF
6 Dosing cylinder
Contains the solution for dosing. Volume
2 mL , 5 mL , 10 mL , 20 mL or 50 mL .
Material: Borosilicate 3.3 or ETFE
7 Cylinder base
Seals the dosing cylinder and contains the
valve disc.
Material: PTFE / Graphite 8 Valve disc
A hole in the valve disc guides the solution
into one (of four) selected openings in the
distributor disc.
Material: Silicone carbide ceramic
9 Distributor disc
The four holes in the distributor disc each
set up a connection with one of the four
ports (input/output) of the dosing unit.
Material: Al
2
O
3
ceramic
10 Distributor
Contains four ports (input/output) for solu-
tions. The ports are actuated by the distribu-
tor disc in the distributor and the valve disc
in the base of the cylinder.
Material: ETFE
11 Fixing ring
For fastening the dosing unit onto a reagent
bottle.
Material: PVDF