Portable Conductivity/TDS Meter
513-160
21
9907X0094 Issue 2
5.1.3 Calibration standards
The calibration standard is selected in the setup menu.
The following three standards are available:
•
84 µS/cm
•
1413 µS/cm
•
12.88 mS/cm
Tables for conductivity values at different temperatures are programmed in
the meter for each standard, see Appendix.
After confirmation of the MTC temperature, the current calibration
standard is blinking.
1)
Select the standard by using ˄ and ˅.
2)
Press
Read
to confirm.
3)
Continue with reference temperature selection or press
Exit
to return to
measurement screen.
5.1.4 Reference temperature
You can select between the reference temperatures 20 °C and 25 °C. The
conductivity of the sample is referenced to the selected temperature during
measurement.
After confirming the selection of the calibration standard, the reference
temperature is blinking.
1) Select the targeted reference
temperature using ˄ and ˅.
2) Press
Read
to confirm.
3)
Continue with α-coefficient setting or press
Exit
to return to
measurement screen.
5.1.5
α-coefficient
The conductivity of a solution increases when the temperature rises. With
most solutions, a linear inter-relationship between conductivity and
temperature is given.
The measured conductivity is corrected and displayed using the following
formula:
G
TRef
= G
T
/ (1 + α (T - T
Ref
) / 100%)
