Air (Water-Saturated Air) Calibration; Water (Air-Saturated Water) Calibration - Thermo Scientific Orion Star A220 Series User Manual

Chapter 6 Using the DO/RDO Channel
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50 Orion Star A220 Series Portable Meter User Manual
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Air (Water-saturated Air) Calibration

1. Press the f1 (cal) key to start the calibration.
2. Press the p or q key to highlight Air and press the f3 (select) key.
3. Prepare the DO sensor and calibration sleeve and allow them to reach equilibrium.
4. When the DO sensor and calibration sleeve are ready, press the f3 (start) key.
5. Wait for the dissolved oxygen value on the meter to stabilize.
a. With a polarographic DO sensor, 102.3% will be displayed when the reading stabilizes.
b. With an RDO optical DO sensor, 100.0% will be displayed when the reading stabilizes.
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.

Water (Air-saturated Water) Calibration

1. Press the f1 (cal) key to start the calibration.
2. Press the p or q key to highlight Water and press the f3 (select) key.
3. Prepare the DO sensor and 100% air-saturated water and allow them to reach equilibrium.
a. Use plastic paraffin film to seal the open area between the DO sensor and vessel
containing the 100% air-saturated water.
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.
a. 100.0% will be displayed when the reading stabilizes.
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.
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