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Manual (Winkler) Calibration
1. Press the f1 (cal) key to start the calibration.
2. Press the p or q key to highlight Manual and press the f3 (select) key.
3. Prepare the DO sensor and calibration solution and allow them to reach equilibrium.
a. Use plastic paraffin film to seal the open area between the DO sensor and vessel
containing the calibration solution.
4. When the DO sensor and calibration apparatus are ready, press the f3 (start) key.
5. Wait for the dissolved oxygen value on the meter to stabilize and perform one of the
following actions:
a. Press the f2 (accept) key to accept the displayed dissolved oxygen value.
or
b. Press the f3 (edit) key to access the popup number entry screen and manually enter
the dissolved oxygen value.
i. Press the p, q, t or u key to highlight a number or decimal point, press the
f3 (enter) key to select the highlighted item and repeat until the desired value is
shown at the top of the screen.
ii. Press the f2 (done) key to save the value and exit the number entry screen.
6. Press the f2 (cal done) key to save and end the calibration.
7. The meter will display the calibration summary and export the data to the calibration log.
Press the f1 (meas) key to proceed to the measurement mode or press the f2 (print) key
to export the calibration data to a printer or computer.
Chapter 6
Using the DO/RDO Channel
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Orion Star A220 Series Portable Meter User Manual
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