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Error Limits
Error limits related to the nominal capacity (= maximum volume) indicated on
the instrument, obtained when instrument and distilled water are equilibrated
at ambient temperature (20 °C/68 °F). Testing takes place according DIN EN
ISO 8655-6 with a completely filled instrument and with uniform and smooth
dispensing up to the nominal or partial volume.
!
20 °C
Ex
The maximum error limit for a single measurement can be calculated EL = A + 2 CV.
The maximum EL for 25 ml size is ±30 µl and for 50 ml size ±50 µl.
This proves that the error limits for Class A burettes per DIN EN ISO 385
are met.
Note:
Comparison of error limits:
* A = Accuracy, CV = Coefficient of Variation ** EL = Error limits
Titrette
®
bottle-top burette
Requirements for piston
burettes according to
DIN EN ISO 8655-3
Glass burette
Class A acc. to
DIN EN ISO 385
Volume
ml
Partial volume
ml
A*
≤± %
µl
CV*
≤ %
µl
A*
≤± %
µl
CV*
≤ %
µl
EL**
± µl
25
25 0.07 18 0.025 6 0.2 50 0.1 25 30
12.5 0.14 18 0.05 6 0.4 50 0.2 25 30
2.5 0.70 18 0.25 6 2 50 1 25 30
50
50 0.06 30 0.02 10 0.2 100 0.1 50 50
25 0.12 30 0.04 10 0.4 100 0.2 50 50
5 0.60 30 0.20 10 2 100 1 50 50
The maximum resolution of the display
in the 25 ml instrument: 0.001 ml, and above a 20 ml titration volume is 0.01 ml;
in the 50 ml instrument: 0.002 ml, and above a 20 ml titration volume is 0.01 ml.
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