Thermo Scientific Orion Star LogR™ Meter User Guide
24
pH Technique
pH Measurement
Note:
Turn on the automatic datalog feature to send measurements to the meter
datalog at the frequency specified in each measurement mode. Refer to the Data
Archiving and Retrieval section for details. If the automatic datalog feature is off,
connect the meter to a printer or computer to record the measurements.
1. Rinse the electrode with distilled or deionized water. Shake off any excess
water and blot the electrode dry with lint-free tissue.
2. Place the electrode into the sample.
a. If the meter is in the continuous measurement mode, it will start reading
immediately and continuously update the display. The
pH
icon will flash
until the reading is stable. Once the reading is stable, log and print the
measurement by pressing
. If a benchtop meter is used and the stirrer
is enabled, press
to start the stirrer. Press
again to turn off the
stirrer before removing the electrode and stirrer from the sample.
b. If the meter is in the AUTO-READ measurement mode, press
to start
the reading. The
AR
icon will flash until the reading is stable. Once the
reading is stable, the meter will log and print the measurement and freeze
the display. If a benchtop meter is used and the stirrer is enabled, the stirrer
will turn on when
is pressed and turn off when the reading is stable.
c. If the meter is in the timed measurement mode, it will start reading
immediately and continuously update the display. The meter will log and
print the measurement at the frequency specified in the setup menu. If a
benchtop meter is used and the stirrer is enabled, press
to start the
stirrer. Press
again to turn off the stirrer before removing the electrode
and stirrer from the sample.
3. Remove the electrode from the sample, rinse it with distilled or deionized water,
blot it dry, place it in the next sample and repeat step 2.
4. Once all of the samples have been measured, rinse the electrode with distilled
or deionized water and blot it dry. Consult the electrode user guide for proper
storage techniques.
