Dissolved oxygen Multi 9310
52 ba75937e03 12/2011
7.3.2 When to calibrate?
z If your evaluation of the FDO
®
check procedure suggests the necessity of a
calibration
z When the calibration interval has expired
z When your accuracy requirements are especially high
z Routinely within the framework of the company quality assurance
7.3.3 Calibration procedures
The Multi 9310 provides 2 calibration procedures:
z Calibration in water vapor-saturated air.
Use an OxiCal
®
air calibration vessel for calibration.
z Calibration via a comparison measurement (e.g. Winkler titration according
to DIN EN 25813 or ISO 5813). At the same time, the relative slope is
adapted to the comparison measurement by a correction factor. When the
correction factor is active, the [Factor] indicator appears in the measuring
screen.
7.3.4 Calibration in water vapor-saturated air
Use the check and storage beaker (FDO
®
Check) to calibrate the FDO
®
925 sensor.
Proceed as follows to calibrate the D.O. sensor:
The FDO
®
925 D.O. sensor ages so little it does not have to be reg-
ularly calibrated.
To detect changes of the sensor as early as possible, the FDO
®
check procedure can be useful (see section 7.2 FDO
®
CHECK PRO-
CEDURE, page 50).
1. Connect the D.O. sensor to the meter.
2. Place the FDO
®
925 D.O. sensor in the check and storage beaker, FDO
®
Check.
The sponge in the check and storage beaker must be moist (not
wet). Leave the sensor in the check and storage beaker long
enough so it can adapt to the ambient temperature.
3. Start the calibration with <CAL>.
The last calibration data (relative slope) is displayed.
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