Metrohm 807 Dosing Unit - Manual (Page 49)

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6 Appendix
807 Dosing Unit
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2 1
Figure 30 Data chip and contact pin
1 Contact surfaces
on the 800 Dosino 2 Data chip with contact pins
on the 807 Dosing Unit
6.2 Dosing accuracy
Every dosing unit is subjected to a strict quality inspection prior to ship-
ment. Every dosing unit is issued a quality certificate attesting conform-
ance with the quality criteria of Metrohm.
6.2.1 Typical measurement deviation
The accuracy of dosing units can be seen in the following table. The val-
ues listed are to be regarded as typical values which can be achieved with
a 700 Dosino or an 800 Dosino.
Table 3 Typical measurement deviation of Metrohm dosing units
Cylinder volume max. systematic deviation
2 mL ± 6 µL
5 mL ± 15 µL
10 mL ± 20 µL
20 mL ± 30 µL
50 mL ± 50 µL
6.2.2 The ISO/EN/DIN standard 8655-3
The Metrohm dosing units fulfil the requirements of the ISO/EN/DIN
standard 8655-3 Volume measurement instruments with pistons –
Part 3: Piston burets. Metrohm guarantees that its dosing units are in
compliance with the following limit values at the time of shipment: