Thermo Scientific Orion Star
™
and Star Plus Meter User Guide
EN-40
Conductivity Calibration
Note:
For an automatic calibration, the nominal cell constant of the conductivity
probe must be entered in the setup menu before the calibration is performed. Refer
to Appendix A for the values of conductivity standards at different temperatures.
1 . In the measurement mode, press
until the arrow icon points to the middle
line, press
until the
µS/cm
or
mS/cm
icon is shown and press
to
begin the calibration .
2 . Rinse the probe with deionized water and place it into the conductivity standard .
3 . To perform a manual calibration – The manual calibration screen will display the
cell constant on the top line, the conductivity value of the calibration standard on
the middle line and
on the bottom line . To change the cell constant, press
until the first digit to be changed is flashing, press
/
to change the
value of the flashing digit and continue to change the digits until:
a . If the conductivity temperature compensation is linear or non-linear (refer
to page EN-12 for conductivity temperature compensation), the displayed
conductivity value matches the value of the standard at the measured
temperature .
b . If the conductivity temperature compensation is off, the displayed
conductivity value matches the value of the standard at the conductivity
reference temperature .
Once the value is set, press
until the decimal point is in the correct location .
Press
to save and end the calibration .
Note:
In the manual calibration screen, start changing the cell constant within
five seconds or the meter will proceed to the automatic/direct calibration. If this
occurs, press and hold
to abort the calibration and repeat the calibration.
4 . To perform an automatic or direct calibration – Wait for the meter to go from
the manual calibration screen to the automatic/direct calibration screen .
The automatic/direct calibration screen will display the conductivity value
of the calibration standard on the middle line and
on the bottom line .
Conductivity Technique
