Thermo Electron CorporationVIII-8 Orion Star Series Meter
Dissolved Oxygen Technique
Water Calibration
The calibration function must be enabled in Setup before
the calibration is started. When stability is reached, the water
standard is set to 100 % or the corresponding concentration
value.
The highest possible accuracy is reached when calibration
temperature is the same as the measuring temperature.
1. Prepare the calibration standard by bubbling air through
a beaker of stirred deionized water for at least one hour.
Ensure that the stirring is vigorous enough to provide
adequate mixing yet not forceful enough to create a vortex
in the beaker. Make sure that the water level is high enough
to fully submerge the probe thermistors, which are located
inside the metal band above the membrane cap. Ensure that
no air bubbles accumulate on the surface of the membrane.
Note: Some magnetic stirrers generate enough heat to change
solution temperature. To avoid this, place a piece of cardboard,
foam rubber or other insulating material between the stir plate
and sample beaker. s
2. Place the dissolved oxygen probe into the aerated water so
that the sensors are immersed. Ensure that there are no air
bubbles accumulating on the membrane.
3. To initiate the Water calibration, press
. The “cal”
indicator will light up.
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