Conductivity Calibration; Automatic Or Direct Conductivity Calibration - Thermo Scientific Orion Versa Star Pro User Manual

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Chapter 5 Conductivity Measurement Module
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80 Orion Versa Star Pro Meter User Manual

Conductivity Calibration

One to six conductivity standards can be used for calibration (up to three for an automatic
conductivity calibration, up to six for a direct conductivity calibration and one for a manual
conductivity calibration). Always use fresh standards and select standards that are near the
expected sample conductivity.

Automatic or Direct Conductivity Calibration

Prepare the conductivity probe according to the instructions in the probe user manual. Connect
the probe and any other electrodes to be used to the module inputs on the selected channel.
In the measurement mode, press the channel key until the channel with the conductivity
module with conductivity probe connected is shown. If needed, press the mode key until Cond
Measurement is shown as the measure mode.
For an automatic calibration, use the
to enter the nominal cell constant of the conductivity probe before the calibration. Use Thermo
Scientific Orion 100 μS/cm, 1413 μS/cm and/or 12.9 mS/cm conductivity standards.
™ ™
1. Press the f1 (Cal) key to start the calibration.
a. If more than one channel is displayed in the measurement mode, press the  or 
key to highlight the desired channel and press the f3 (Select) key.
2. Rinse the conductivity probe and any other electrodes in use with distilled water, blot dry
with a lint-free tissue and place into the standard.
3. When the conductivity probe and standard are ready, press the f3 (Start) key.
a. If using a stirrer probe, the stirrer probe will start stirring when the f3 (Start) key is
pressed and stop stirring when the reading stabilizes.
4. Wait for the conductivity value on the meter to stabilize and perform one of the following
actions:
a. Press the f2 (Accept) key to accept the displayed value.
or
b. Press the f3 (Edit) key, press the f3 (Clear) key and use the numeric keypad to enter
the conductivity value of the standard at the measured temperature. Press the
f2 (Accept) key to confirm the entered value.
5. Press the f2 (Next) key to proceed to the next standard and repeat steps 2 through 4 or
press the f3 (Cal Done) key to save and end the calibration.
6. The meter will display the calibration summary and export the data to the calibration log.
Press the measure (esc) key to proceed to the measurement mode.
Cell Constant Entry procedure or Conductivity Mode Menu
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