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6.4 Calibration Screen
From the Calibration screen, you can perform calibrations by pressing on Zero Calibration , Air Calibration ,
and 4–20mA Span .
*
NOTE
*
Before calibrating, remove the ST-772 dissolved oxygen sensor from the water
and wipe it with a damp cloth to remove debris and any biofouling. If there is water on the
membrane, dry it with a soft cloth, taking special care not to damage the membrane.
Figure 13.
6.4.1 Zero Calibration
1. Place the sensor in Nitrogen Gas or 5% Sodium Sulfite solution (anaerobic water).
2. Let the ST-772/T sensor stand for a minimum of 15 minutes. Observe the values being displayed on
the Calibration screen.
3. Once the displayed oxygen and temperature values are stable, click Zero Calibration to perform a
zero calibration.
4. If the calibration is successful, the interface will return a message ”Calibration Succeeded”. If the
calibration fails, click Zero Calibration again and repeat.
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