BrandTech Scientific seripettor - Manual (Page 38)

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 with a completely filled instrument and with uniform and
smooth dispensing.
Nominal volume
ml A* ≤ ±
%
µl
CV* ≤
%
µl
2 1.2 24 0,2 4
10 1.2 120 0,2 20
25 1.2 300 0,2 50
* A = Accuracy, CV = Coefficient of Variation
Error limits seripettor ®
!
20 °C
Ex
38
e.g. Volume A* ≤ ±
%
µl
CV* ≤
%
µl
V
N
10 1.2 120 0,2 20
V
T
= 50% N 5 2.4 120 0,4 20
V
T
= 10% N 1 12 120 2,0 20
Note:
The maximum error limit for a single measurement can be calculated
EL = A + 2 CV (e.g. for volume 10 ml: 120 µl + 2 x 20 µl = 160 µl).
Partial volume
The percentage values for A and CV are relative to the nominal volu-
me (V
N
) and must be converted for partial volumes (V
T
).
V
N
V
T
A
T
= · A
N
* A = Accuracy, CV = Coefficient of Variation