Xylem ProLab 2000 - Manual (Page 75)

ProLab 2000 Operation
75 ba75577e05 11/2013
4.8.4 D.O. calibration
Why calibrate? D.O. sensors age. This changes the slope of the D.O. sensor.
Calibration determines the current slope of the sensor and stores this
value in the instrument.
When to calibrate?  After connecting another non-ID D.O. sensor
 When the CalClock flashes (after the calibration interval has
expired).
Calibration datasets The ProLab 2000 administrates two sets of calibration data:
Sensors of different types can be calibrated separately from each other.
When a sensor of one type is calibrated, the calibration data of the
other types remain stored. The ProLab 2000 recognizes the type of the
connected sensor and automatically uses the correct calibration data.
Calibration procedures The ProLab 2000 provides 2 calibration procedures:
 Calibration in water vapor-saturated air.
Use an air calibration vessel for calibration.
 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 window.
Stability control During calibration, the stability control is automatically activated.
Display of calibration
data and download to
interface
You can have the data of the last calibration displayed (see page 87).
Subsequently, you can transmit the displayed calibration data to the
interface, e. g. to a printer or PC, with the <PRINT> key.
Note
The calibration record is automatically transmitted to the interface after
calibrating.
 Set 1 for the type, "Ox": – 9009/6. or
– Ox1400Stir
 Set 2 for the type,
"FOx1400":
– LFOx1400