Automatic Conductivity Calibration - Giorgio Bormac 8+ Série Manuel D'utilisation

Compensation coefficients for calibration standards at different temperatures for T
following table.
0.001 mol/L KCl (147µS)
0
15
35
45
100
The following formula is used to determine the calibration coefficient of a particular solution:
Where tc is the temperature coefficient to be calculated, C
and temperature 2 (T2).
Each result with the compensated temperature is affected by an error caused by the temperature coefficient.
The better the temperature correction, the lower the error. The only way to eliminate this error is to not use
the correction factor, acting directly on the sample temperature.
Set as temperature coefficient 0.00% to deactivate the compensation. The displayed conductivity value
refers to the real temperature value measured by the probe and not related to a reference temperature.
• Ultrapure water*: Select this option when working with conductivity lower than 10 µS/cm.
An icon in the upper left corner informs the user that this compensation mode is being used.
When this threshold is exceeded, this option is automatically disabled, and linear compensation is
activated.
* function available only for 80+ Series.
The temperature coefficient in ultrapure water varies strongly. The main reason for this is that the
self-ionization of water molecules is more temperature-dependent than the conductivity caused by the other
ions.
Note: Low conductivity measurements (<10 µS/cm) are strongly influenced by atmospheric carbon dioxide.
To obtain reliable results it is important to prevent contact between the sample and the air, this can
be achieved by using a flow cell or chemically inert gases such as nitrogen or helium that isolate the
sample surface.
P2.8 Temperature calibration
All the instruments within this series are pre-calibrated for a correct measure of the temperature. However,
if there is a difference between the measured and the real one (usually due to a malfunction of the probe),
it is possible to adjust the offset of + 5 ° C.
• Use and keys to correct the temperature offset value and press
P2.9 TDS Factor
Access this menu to adjust TDS factor 0.4....1.00 / -default 0.71- to perform the conversion from conductivity
to TDS.
• Consult paragraph "Other measurements perform with the conductivity cell".
P2.10 Restore factory default.
If the instrument does not work properly or incorrect calibrations have been performed press Yes with
key to return all Cond parameters to the factory default setting.
IMPORTANT: the factory reset of the parameters does not delete stored data.

• Automatic Conductivity calibration

Example for one point calibration (1413 µS/cm) using a 1 cell constant sensor
In Cond measurement mode press and hold for 3 sec "
•
• In PC devices Cond calibration can be accessed also from simultaneous pH/Cond screen then selecting
Cond.
UM Serie 880 EN rev.2 30.07.2020
0.01 mol/L KCl (1413 µS)
1.81
1.92
2.04
2.08
2.27
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�������� = 100����
����2
���� ( ���� − 25 ) − ����
����1 2
25
25 °C are shown in the
ref
0.1 mol/L KCl (12.88 mS)
1.81
1.91
2.02
2.06
2.22
− ����
����1
(���� − 25)
����2 1
and C are conductivity at temperature 1 (T1)
T1 T2
key to confirm.
CAL" key to enter in calibration mode.
1.78
1.88
2.03
2.02
2.14
EN