Xylem MultiLab 4010-2 Manual de usuario descargar pdf (Pagina 48)

Dissolved oxygen (D.O.) MultiLab 4010-2

48 ba76142e01 05/2013

Criteria for a stable

measured value

The Stability control function checks whether the measured values are stable

within the monitored time interval.

The minimum duration until a measured value is assessed as stable is the mon-

itored time interval. The actual duration is mostly longer.

7.1.2 Measuring the temperature

For reproducible D.O. measurements, it is essential to measure the tempera-

ture of the test sample.

IDS D.O. sensors measure the temperature with a temperature sensor inte-

grated in the IDS sensor.

7.2 Calibration

7.2.1 Why calibrate?

D.O. sensors age. This changes the zero point (asymmetry) and slope of the

D.O. sensor. As a result, an inexact measured value is displayed. Calibration

determines and stores the current values of the zero point and slope.

7.2.2 When to calibrate?

 When the calibration interval has expired

 When your accuracy requirements are especially high

 Routinely within the framework of the company quality assurance

7.2.3 Calibration procedures

The MultiLab 4010-2 provides 2 calibration procedures:

3. Using <ENTER>, start a further measurement with stability control.

Release the frozen measured value again with <AR> or <M>.

The [AR] status display disappears. The display switches back to the

previous indication.

Measured parameter Time interval Stability in the time

interval

D.O. concentration 20 seconds

Δ : better than 0.03 mg/l

D.O. saturation 20 seconds

Δ : better than 0.4 %

D.O. partial pressure 20 seconds

Δ : Better than 0.8 mbar

Temperature 15 seconds

Δ : Better than 0.5 °C

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Xylem MultiLab 4010-2 Manual de usuario Pagina 48