Relative Mv Calibration - Thermo Scientific Orion Versa Star Pro User Manual

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Chapter 4 pH, pH/ISE and pH/LogR Measurement Modules
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54 Orion Versa Star Pro Meter User Manual

Relative mV Calibration

One standard can be used for relative mV calibration. Always use fresh standard for calibration.
Prepare the electrode according to the instructions in the electrode user manual. Connect the
electrode 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 pH, pH/ISE or
pH/LogR module with electrode connected is shown. If needed, press the mode key until RmV
Measurement is shown as the measure mode.
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 electrode and any other electrodes in use with distilled water, blot dry with a lint-
free tissue and place into the standard.
3. When the electrode 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 mV 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 and use the f3 (Clear) key and numeric keypad to enter the
relative mV value. Press the f2 (Accept) key to confirm the entered value.
5. The meter will display the calibration summary including the mV offset. Press the
f3 (Cal Done) key to save the calibration and export the data to the calibration log. Press
the measure (esc) key to proceed to the measurement mode.
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