Thermo Scientific Orion Versa Star Pro User Manual page 60

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Chapter 4 pH, pH/ISE and pH/LogR Measurement Modules
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60 Orion Versa Star Pro Meter User Manual
LogR Temperature Calibration Procedure
Prepare the glass-bulb pH electrode according to the instructions in the electrode user manual.
Connect the pH electrode to the pH/LogR module input on the selected channel. If an ATC
probe will be used as the temperature source, prepare and connect the ATC probe to the
pH/LogR module input on the same channel. Use a constant temperature bath or a hot plate to
attain the desired temperatures of the calibration solutions.
1. In the measurement mode, press the setup key.
2. Press the ,,  or  key to highlight Channel 1, Channel 2, Channel 3 or Channel 4
and press the f3 (Select) key.
a. Select the appropriate channel number that the pH/LogR module is connected.
3. Press the  or  key to highlight Temperature and press the f3 (Select) key.
4. Press the  or  key to highlight Temperature Input and press the  or  key to
highlight the pH electrode that will be used for the LogR mode (i.e. Ch2-LogR).
 This enables the LogR mode for the selected channel and allows a LogR temperature
calibration to be performed.
5. Press the  or  key to highlight Temperature Cal and press the f3 (Select) key.
6. Place the pH electrode and NIST-traceable thermometers or ATC probe into a calibration
solution (pH buffer or tap water) with a known, stable temperature. Moderately stir the
solution using an
Orion Star stirrer probe
7. Press the f3 (Start) key and wait for the temperature value on the meter to stabilize.
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.
8. Once the temperature value is stable, 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, use the numeric keypad to enter the
temperature value and press the f2 (Accept) key to confirm the entered value.
9. Press the f2 (Next) key to proceed to the next calibration point and repeat steps 6-8 or
press the f3 (Cal Done) key to save and end the calibration.
(Catalog Number 096019) or stir plate with stir bar.
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