Metrohm 1.873.0014, Manual

Page: 58 / 192

4.4 Calibration functions
￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
50 ￭￭￭￭￭￭￭￭
873 Biodiesel Rancimat
￭
Enter the conductivity of the standard used.
c(KCl) = 1 mmol/L can be used as a standard solution. This is derived
from the optionally available conductivity standard 6.2301.060
(KCl 0.1 mol/L) through dilution with distilled water. The conductivity
of this diluted solution is:
Temperature Conductivity
18 °C
19 °C
20 °C
21 °C
22 °C
23 °C
24 °C
25 °C
127 µS/cm
130 µS/cm
133 µS/cm
136 µS/cm
138 µS/cm
141 µS/cm
144 µS/cm
147 µS/cm
Alternatively, the conductivity standard 6.2324.000 (undiluted) can be
used.
3 Start determination and check the values
￭
Click on [Start] to start the determination of the cell constant.
After the determination is finished, the dialog window Enter/Check
cell constants appears again.
If you wish to accept the displayed values, click [OK] .
If you wish to maintain the old values, click [Cancel] .
4.4.2 Determining Delta T
The
temperature correction Delta T
indicates the deviation of the current
temperature of the sample from the temperature in the heating block and
belongs to the method as a parameter
(see Chapter 4.5.2, page 60) . It
can automatically be determined with the calibrated, external temperature
sensor (part of the optionally available GLP test set,
see Optional accesso-
ries, page 180 ).