Gilson F81040, User Manual

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E
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36
PIPETMAN® M CONNECTED
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USER’S GUIDE
APPENDICES
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PIPETMAN® M CONNECTED
Appendix C – Evaporation Loss
Procedure for the determination of Evaporation Loss
Use the same distilled water, weighing vessel and balance as you will be using for the
gravimetric check.
Half fill the weighing vessel with distilled water.
1.
Cover the weighing vessel with its lid and place it on the balance using a pair of
tweezers.
2. Aspirate a sample.
3. Tare the balance and take the weighing vessel out of the balance.
4. Take off the lid with tweezers.
5. Dispense the sample into a dummy vessel.
6. Replace the lid on the weighing vessel and, using tweezers, replace the vessel on
the balance.
7. Read the negative result e
1
(record the absolute value).
8. Repeat steps 3 to 8, three times to obtain e
2
, e
3
, and e
4
.
9. Calculate the evaporation loss e using the formula:
NOTE
in normal conditions, this value is usually between 0.01 mg and 0.03 mg.
e = (e
1
+ e
2
+ e
3
+ e
4
)
1
4
Appendix B – Z Factor
The reference calculation equation is :
z = [1/(P
W
-P
A
)] [1-(P
A
/P
B
)]
Where: P
A
= density of air at t°C.
P
W
= density of the test liquid at t°C.
P
B
= density standard weight used to
calibrate the balance
Use 8 g/cc for P
B
NOTE
For rB use 8000kg/m3 according to OiML recommendation N°33
(Conventional Value of the result of weighing in air
Values of the conversion factor z (µL/mg) as a function of temperature and pressure for
distilled water.
TEMPERATURE AIR PRESSURE (HPA)
(°C) 800 853 907 960 1013 1067
15 1.0018 1.0018 1.0019 1.0019 1.0020 1.0020
15.5 1.0018 1.0019 1.0019 1.0020 1.0020 1.0021
16 1.0019 1.0020 1.0020 1.0021 1.0021 1.0022
16.5 1.0020 1.0020 1.0021 1.0022 1.0022 1.0023
17 1.0021 1.0021 1.0022 1.0022 1.0023 1.0023
17.5 1.0022 1.0022 1.0023 1.0023 1.0024 1.0024
18 1.0022 1.0023 1.0024 1.0024 1.0025 1.0025
18.5 1.0023 1.0024 1.0025 1.0025 1.0026 1.0026
19 1.0024 1.0025 1.0025 1.0026 1.0027 1.0027
19.5 1.0025 1.0026 1.0026 1.0027 1.0028 1.0028
20 1.0026 1.0027 1.0027 1.0028 1.0029 1.0029
20.5 1.0027 1.0028 1.0028 1.0029 1.0030 1.0030
21 1.0028 1.0029 1.0030 1.0030 1.0031 1.0031
21.5 1.0030 1.0030 1.0031 1.0031 1.0032 1.0032
22 1.0031 1.0031 1.0032 1.0032 1.0033 1.0033
22.5 1.0032 1.0032 1.0033 1.0033 1.0034 1.0035
23 1.0033 1.0033 1.0034 1.0035 1.0035 1.0036
23.5 1.0034 1.0035 1.0035 1.0036 1.0036 1.0037
24 1.0035 1.0036 1.0036 1.0037 1.0038 1.0038
24.5 1.0037 1.0037 1.0038 1.0038 1.0039 1.0039
25 1.0038 1.0038 1.0039 1.0039 1.0040 1.0041
25.5 1.0039 1.0040 1.0040 1.0041 1.0041 1.0042
26 1.0040 1.0041 1.0042 1.0042 1.0043 1.0043
26.5 1.0042 1.0042 1.0043 1.0043 1.0044 1.0045
27 1.0043 1.0044 1.0044 1.0045 1.0045 1.0046
27.5 1.0044 1.0045 1.0046 1.0046 1.0047 1.0047
28 1.0046 1.0046 1.0047 1.0048 1.0048 1.0049
28.5 1.0047 1.0048 1.0048 1.0049 1.0050 1.0050
29 1.0049 1.0049 1.0050 1.0050 1.0051 1.0052
29.5 1.0050 1.0051 1.0051 1.0052 1.0052 1.0053
30 1.0052 1.0052 1.0053 1.0053 1.0054 1.0055
Table 3
Z Factor