Calibration Procedure - wtw Oxi 330i Bedienungsanleitung

Oxi 330i/340i
Calibration
procedures
Sensor evaluation

Calibration procedure:

The Oxi 330i/340i provides 2 calibration procedures:
l Calibration in water vapor-saturated air. Use the OxiCal
tion vessel (accessories) for the calibration.
l Calibration via a comparison measurement (e. g. Winkler titration accord-
ing to DIN EN 25813 or ISO 5813). At the same time, the relative slope is
adapted to the comparison measurement by a correction factor.
After the calibration, the measuring instrument evaluates the current status
of the sensor against the relative slope. The evaluation appears on the dis-
play. The relative slope has no effect on the measuring accuracy. Low values
indicate that the electrolyte will soon be depleted and the probe will have to
be regenerated.
Display
E3
Invalid calibration
Calibration procedure:
®
Relative slope
S = 0.8 ... 1.25
S = 0.7 ... 0.8
S = 0.6 ... 0.7
S < 0.6 or S > 1.25
-SL air calibra-
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