Error Limits (Nominal Volume, Partial Volume) - BRAND Titrette Instrucciones De Manejo

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.
Comparison of error limits:
Volume Partial volume
ml ml
10 10
5
1
25 25
12.5
2.5
50 50
25
5
* A = Accuracy, CV = Coefficient of Variation ** EL = Error limits
The titration volume is displayed in 1 µl graduations in the 10 ml and 25 ml instruments, and in 2 µl gra-
duations in the 50 ml instrument. Starting at a titration volume of 20 ml, there is an automatic conversion
to 10 µl graduations.
The drop size for the 10 ml instrument is approx. 20 µl, and for the 25 and 50 ml instruments approx.
30 µl.
Note:
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.
The device is marked in accordance with the German Measurement and
Calibration Act as well as the Measurement and Calibration Regulation:
18
Character string: DE-M (DE for Germany), framed by a rectangle, as well as the last two digits of the year
in which the marking was affixed (here: 2018).
Titrette
®
bottle-top burette
A* CV*
≤± % µl ≤ %
µl
0.10 10 0.05 5
0.20 10 0.10 5
1.00 10 0.50 5
0.07 18 0.025 6
0.14 18 0.05 6
0.70 18 0.25 6
0.06 30 0.02 10
0.12 30 0.04 10
0.60 30 0.20 10
Requirements for piston
burettes according to
DIN EN ISO 8655-3
A* CV*
≤± % µl ≤ %
µl
0.3 30 0.1 10
0.6 30 0.2 10
3 30 1 10
0.2 50 0.1 25
0.4 50 0.2 25
2 50 1 25
0.2 100 0.1 50
0.4 100 0.2 50
2 100 1 50
Error Limits
20 °C
!
Ex
Glass burette
Class A acc. to
DIN EN ISO 385
EL**
± µl
20
20
20
30
30
30
50
50
50
45