Thermo Scientific Orion Star
™
and Star Plus Meter User Guide
EN-28
Polarographic Dissolved Oxygen 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 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 .
Note:
Benchtop Star Plus dissolved oxygen meters allow the measurement
and stirring functions to be controlled by the AUTO-STIR probe when the
meter is in the AUTO-READ measurement mode. Press the button on the
AUTO-STIR probe to start and stop measurement and stirring functions.
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 .
Polarographic Dissolved Oxygen Technique
Summary of Contents for Orion Star
Page 367: ......
