
29
Mean value
x =
Σ
x
i
n
Mean volume
Accuracy*
Coefficient of Variation*
Standard Deviation
V = x · Z
100 s
V
CV% =
Σ
(x
i
– x)
2
n – 1
s = Z ·
V – V
0
V
0
A% = · 100
8. Checking the Volume
Depending on use, we recommend inspection of the instrument every 3 to 12 months. The cycle
can, however, be adjusted to individual requirements.
The gravimetric testing of the pipette volume is performed according to the following steps and is in
accordance with DIN EN ISO 8655, Part 6.
1. Set nominal volume
Set volume to the maximum volume indi-
cated on the instrument (see page 27 for
procedure).
2. Condition the pipette
Condition the pipette before testing by using
a pipette tips to aspirate and discharge the
test liquid (distilled H
2
O) five times. After
this, discard the pipette tips.
3. Carry out the test
a) Attach new pipette tips and prerinse one
time with test liquid.
b) Aspirate liquid and pipette it into the weigh-
ing vessel.
c) Weigh the pipetted quantity with an analyti-
cal balance. (Please follow the operating
manual instructions from the balance manu-
facturer.)
d) Calculate the volume, taking the tempera-
ture into account.
e) At least 10 pipettings and weighings in three
volume ranges (100%, 50%, 10% of nomi-
nal volume) are recommended for statistical
analysis.
Calculation for nominal volume V
0
x
i
= Weighing results
n = Number of weighings
Z = Correction factor (e.g. 1,0029 μl/mg at 20 °C, 1013 hPa)
Note:
Each individual channel must be tested
seperately.
*) = Calculation of accuracy (A%) and variation
coefficient (CV%): A% and CV% are calculated
according to the formulas for statistical control.
Note:
Testing instructions (SOPs) are available for
download at www.vitlab.de.
Содержание 1608002
Страница 2: ...2...
Страница 84: ...1 1 2 3 4 P85 5 6 7 8 9 P100 84...
Страница 85: ...3 15 40 59 F 104 F 500 mbar 260mPa s 260 cps 2 4 1 1 8 F 5 85...
Страница 86: ...6 VITLAB 86 VITLAB 8...
Страница 87: ...2 4 a b 2 3mm c 1 2s d 1 3 7 87...
Страница 88: ...6 ISO 8655 c d e 5 a 30 45 b 88...
Страница 91: ...10 1 p89 2 3 4 5 6 91...
Страница 92: ...11 121 250 F 15min DIN EN285 1 2 3 11 25 11 26 99 92 12...
Страница 93: ...A III I II B C Z 13 V O A B C 13 1 93...
Страница 94: ...13 3 1 2 3 13 4 1 2 VITAB 8 12 1 2 10 100 13 2 94...
Страница 95: ...M 1 2 90 3 M 14 14 1 95...
Страница 96: ...6 94 5 VITLAB 8 12 30 300 l 4 VITLAB 8 12 30 300 l 96...
Страница 97: ...Z 1 2 90 3 4 5 14 2 Z 97...
Страница 98: ...a b 6 7 a b 8 94 98...
Страница 100: ...17 100 87...
Страница 102: ...19 20 102...
Страница 104: ...1 1 2 3 4 103 5 6 7 8 9 117 104...
Страница 105: ...2 3 15 C 40 C 500 mbar 260 mPa s 4 1 C 5 FKM 105...
Страница 106: ...106 6 VITLAB 8 VITLAB 100 l...
Страница 107: ...107 a b 2 3 c 1 2 d 4 2 7 1 3...
Страница 108: ...108 6 ISO 8655 c d e a 30 45 b 5...
Страница 111: ...111 10 1 109 2 3 4 5 1 6...
Страница 112: ...112 11 Vitlab 121 C 2 bar 15 DIN EN 285 1 2 3 11 25 11 26 119 12 UV...
Страница 113: ...A III I II B C Z 113 13 A I B II Z C III 13 1...
Страница 114: ...114 Vitlab micropipette 8 12 1 2 10 120 13 3 1 2 3 Z 13 4 1 2 13 2...
Страница 115: ...M 115 1 2 90 3 M 14 14 1...
Страница 116: ...116 6 114 5 Vitlab micropipette 8 12 30 300 l 4 Vitlab micropipette 8 12 30 300 l...
Страница 117: ...Z 117 1 2 90 3 4 5 14 2 Z...
Страница 118: ...a b 118 6 7 a b 8 114...
Страница 120: ...120 17 107...
Страница 122: ...122 19 20...
Страница 123: ...23...
Страница 124: ...13 1695071 0612 1...