2 measuring the temperature, 2 calibration, 1 why calibrate – YSI MultiLab 4010P-1 User Manual

Page 47: 2 when to calibrate, 3 calibration procedures, Measuring the temperature, Calibration, Why calibrate, When to calibrate, Calibration procedures

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MultiLab 4010-1

Dissolved oxygen

ba76141e03

03/2014

47

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 and slope of the IDS D.O.
sensor. As a result, an inexact measured value is displayed. Calibration deter-
mines 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 4010-1 provides 2 calibration procedures:

Calibration in water vapor-saturated air.

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.

Calibration can be carried out either as a 1-point calibration or 2-point calibra-
tion procedure.

Measured parame-
ter

Time interval

Stability in the time interval

D.O. concentration

20 seconds

: better than 0.03 mg/l

D.O. saturation

20 seconds

: better than 0.4 %

Temperature

15 seconds

: Better than 0.5 °C

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