Error Limits - BRAND Titrette Instrucciones De Manejo

9 Error limits

20 °C
!
Ex
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 Limit
On 10 ml and 25 ml instruments, the titration volume is shown in 1 µl increments; on 50 ml instru-
ments it is shown in 2 µl increments. From a titration volume of 20 ml, this changes automatically to
10 µl increments.
The drop size for the 10 ml instrument is approx. 20 µl, and approx. 30 µl for the 25 ml and 50 ml in-
struments.
The maximum error for a single measurement can be approximated from the sum of error limits EL = A
+ 2 × CV. For the 25 ml instrument this amounts to a maximum of ± 30 µl, and ± 50 µl for the 50 ml in-
strument.
As a result, Class A glass burettes are within the error limits according to DIN EN ISO 385.
9974 69
Error limits in relation to the nominal capacity (= maximum
volume) indicated on the instrument at equal temperature
(20 ºC/68 °F) of instrument, ambient environment and dis-
tilled water. Testing takes place according DIN EN ISO 8655-
6 with a completely filled instrument and with uniform and
smooth dispensing.
Bottle-top
burette Titrette®
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
NOTICE
Bottle-top
burettes in accor-
dance with
DIN EN ISO 8655- 3
A* VC* %
± % ±µl µl
0.3 30 0.1 10 20
0.6 30 0.2 10 20
3 30 1 10 20
0.2 50 0.1 25 30
0.4 50 0.2 25 30
2 50 1 25 30
0.2 100 0.1 50 50
0.4 100 0.2 50 50
2 100 1 50 50
9 Error limits
Glass burettes
Class A in accor-
dance with
DIN EN ISO 385
EL**
± µl
Operating manual
65