17
Thermo Scientific Orion Star A213 Benchtop and Star A223 and Star A323 Portable RDO/DO Meter Reference Guide
Manual Dissolved Oxygen Calibration
A manual calibration is performed using a water sample with a known concentration of dissolved oxygen. This
method can be used to calibrate the DO probe to the value achieved by a Winkler titration. A manual calibration
involves performing a Winkler titration and using that sample as a calibration standard. The oxygen level result
from the titration is entered in a manual calibration as the dissolved oxygen value. This correlates the meter input
to the Winkler titration. This method is inherently less accurate, due to the possibility of titration errors.
Note: In most calibration screens, press
f1 (esc)
to return to the measurement mode without saving the calibration.
*OUIFNFBTVSFNFOUNPEFQSFTT
f1 (cal)
.
2. Press
or
to highlight
Manual
and press
f3 (select)
.
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place into the prepared water sample with a known dissolved oxygen concentration. Allow the DO probe and
water sample to reach equilibrium.
8IFOUIF%0QSPCFBOEXBUFSTBNQMFBSFSFBEZQSFTT
f3 (start)
.
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a. Press
f2 (accept)
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b. Press
f3 (edit)
to access the numeric entry screen and edit the dissolved oxygen value.
i. Press
,
,
or
to highlight a number or decimal point, press
f3 (enter)
to select
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ii. Press
f2 (done)
to exit the numeric entry screen.
iii. Press
f2 (accept)
to accept the entered dissolved oxygen value.
1SFTT
f3 (cal done)
to export the data to the calibration log or press
f2 (print)
to export the data to the
calibration log and a printer or computer. The meter will automatically proceed to the measurement mode.
