Error limits, 20 °c ex, English – BrandTech Scientific Dispensette III User Manual
Page 45
!
20 °C
Ex
Type Digital • Easy
Calibration is manufac-
tured under U.S. Patent
5,957,330.
English
45
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.
Note:
* A = Accuracy, CV = Coefficient of Variation
Error limits Dispensette
®
The error limits are well within the limits of DIN EN ISO 8655-5. The maxi-
mum error limit for a single measurement can be calculated EL = A + 2 CV
(e.g. for volume 25 ml: 125 µl + 2 x 25 µl = 175 µl).
Nominal volume
ml
A*
≤ ±
%
µl
CV*
≤
%
µl
0,5
1.0
5
0.2
1
1
0.5
5
0.1
1
2
0.5
10
0.1
2
5
0.5
25
0.1
5
10
0.5
50
0.1
10
25
0.5
125
0.1
25
50
0.5
250
0.1
50
100
0.5
500
0.1
100
Partial volume
The percentage values for A and CV are relative to the nominal volume (V
N
)
and must be converted for partial volumes (V
T
).
V
N
V
T
A
T
= · A
N
e.g.
volume
A*
≤ ±
%
µl
CV*
≤
%
µl
V
N
25.0
0.5
125
0.1
25
V
T
= 50% N
12.5
1.0
125
0.2
25
V
T
= 10% N
2.5
5.0
125
1.0
25
* A = Accuracy, CV = Coefficient of Variation