3.2.2 Span Calibration in Air (all Oxygen modes)
1. Hang the Dissolved Oxygen sensor in air. The tip of the Dissolved Oxygen sensor should be
pointing downwards.
Allow the reading to stabilise. After a zero calibration, this may take up to 5 minutes.
2. Select Oxygen Calibration. ( →→ F1:Calibrate →→ F1:Oxygen)
When the reading is above approximately 25% Saturation, 2 ppM or 5% Gaseous, the
90-FL will display the AIR calibration screen…
101.0%Sat 25.0
o
c
Oxygen AIR Calibration, Press Enter
Press to calibrate.
A “∗” in the display will be replaced by a decimal point after a successful air calibration.
3. The 90-FL is now calibrated and is ready for Dissolved Oxygen measurements. Rinse the
Dissolved Oxygen sensor in distilled water and blot dry before placing it into unknown
samples.
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