Metrohm 700 Dosino - Manual (Page 44)

4.2 Dosing accuracy according to ISO 8655-3
700 Dosino, Instructions for use 38
4.2 Dosing accuracy according to ISO 8655-3
Metrohm Ltd. guarantees the following limits (according to ISO
8655-3, draft) for Dosino burets with glass cylinders:
Max. permissible systematic error e
s
Nominal
cylinder volume
Maximum permissible systematic errors e
s
a)
in mL rel. abs.
2 ± 0,3 % ± 6 µL
5 ± 0,3 % ± 15 µL
10 ± 0,2 % ± 20 µL
20 ± 0,2 % ± 40 µL
50 ± 0,2 % ± 100 µL
a) Expressed as deviation of the mean of a tenfold measurement
from any given volume in the range of 10 to 100 % of the nominal
volume.
s s
V V e
− =
or in %
( )
0
100
V
Vs V
s
e
−
=
V : mean
s
V : selected volume
0
V : nominal volume
Maximum permissible random error s
Nominal
cylinder volume
Maximum permissible random errors
repeatybility s
in mL CV b) s c)
2 ± 0,1 % ± 2 µL
5 ± 0,1 % ± 5 µL
10 ± 0,07 % ± 7 µL
20 ± 0,07 % ± 14 µL
50 ± 0,05 % ± 25 µL
b) Expressed as coefficient of variation of a tenfold measurement
from any given volume in the range of 10 to 100 % of the nominal
volume.
V
s
CV
100
=
c) Expressed as repeatability standard deviation of a tenfold mea-
surement from any given volume in the range of 10 to 100 % of
the nominal volume.