YSI MultiLab 4010-1W, Operating Manual

Page: 49 / 114

MultiLab 4010-1W Dissolved oxygen
ba76141e07 08/2018
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7.3 Calibration
7.3.1 Why calibrate?
D.O. sensors age. Aging changes the zero point 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.
7.3.2 When to calibrate?

If your evaluation of the
FDO Check
suggests calibrating (only FDO 4410)

When the calibration interval has expired

When your accuracy requirements are especially high

Routinely within the framework of the company quality assurance

After a Zero calibration .
7.3.3 Calibration procedures
The MultiLab 4010-1W 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 multiplier. When
the correction multiplier is active, the
[Factor] indicator appears in the mea-
suring window.
7.3.4 Calibration in water vapor-saturated air
For this calibration procedure, the Comparison meas. setting must be set to off
in the Calibration menu.
As the calibration vessel use a BOD bottle that contains a small amount of
clean water (approx. 40 ml). The sensor must not be immersed in the water.
The FDO 4410 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 C
HECK
(
CHECKING THE
FDO 4410), page 47).
For both calibration procedures, an additional Zero calibration is
possible (see section 7.3.6 Z
ERO CALIBRATION
, page 52).
To calibrate the
FDO 4410
, use the calibration and storage vessel
FDO Check. The sponge in the check and storage beaker must be
moist (not wet).