12
7.2 Volume error limits for piston operated pipettes
Table 7.2.1: Excerpt from DIN EN ISO
Nominal volume
µl
A
≤
± %
CV*
≤
%
10
20
100
200
1000
5000
10000
Nominal volume
µl
A
≤
± %
CV*
≤
%
8655, Part 2
Table 7.2.2: Values from operating manual
VITLAB micropipette
®
The stated volume error limits for the VITLAB micropipette (Table 7.2.2) are final test values relative
to the nominal capacity. These error limits refer to new instruments under optimised test conditions
(qualified operators and standardised ambience conditions). Typically these error limits are two times
®
better under ideal testing conditions (experience of the manufacturer). For partial volumes the absolute
value (µl) corresponding to the nominal volume is applied.
1
1.6
7
0,5
1
4
0.8
1.2
5
0.4
0.7
2
0.6
0.8
3
0.2
0.4
1
0.6
0.8
3
0.2
0.3
0.6
0.6
0.8
3
0.2
0.3
0.6
0.6
0.8
3
0.2
0.3
0.6
0.6
0.8
3
0.2
0.3
0.6
10
5
1
20
10
2
100
50
10
200
100
20
1000
500
100
5000
2500
500
10000
5000
1000
1.2
0.8
1.0
0.5
0.8
0.3
0.8
0.3
0.8
0.3
0.8
0.3
0.6
0.3
For calibration, the error limits to be observed by the operator must individually defined by the user.
For this purpose, the following methods can be applied:
If required by the application and if the optimised conditions for measuring are present, the stated
►
In correspondence to the German regulations for official testing, it is also admissible to apply limits
►
►
The user may also define his own individual tolerance limits corresponding to his particular applicat-
error limits can also be expected in the case of used volumetric instruments are in good working
order.
which are typical for practice. These practice limits correspond to double the limits for official testing.
In this case, the values in table 7.2.2. should be doubled!
ion, and apply these error limits for the calibration of the instrument.
The above procedures fulfil the requirements of DIN EN ISO 9001, DIN EN ISO 10012 and DIN EN
ISO / IEC 17025.
