VWR International sympHony, User Manual

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26
sympHony
™
Meter User Guide
Dissolved Oxygen Measurement
1. Rinse the dissolved oxygen probe with distilled or deionized water. Shake off
any excess water and blot the probe dry with lint-free tissue.
2. Place the dissolved oxygen probe into the sample.
a. If the meter is in the continuous measurement mode, it will start reading
immediately and continuously update the display. The mg/L or % sat 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 probe 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 reading 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.
If the BOD AUTO-STIR probe is used, press the button on the probe to start
the AUTO-READ measurement.
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 probe and
stirrer from the sample.
3. Remove the dissolved oxygen probe 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 dissolved oxygen probe
with distilled or deionized water and blot it dry. Consult the dissolved oxygen
probe user guide for proper storage techniques.
Dissolved Oxygen Technique