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Dissolved Oxygen Transmitter
Span Calibration
Span Calibration
Oxygen
Set actual measurement
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A span check or calibration is conduct-
ed as follows:
• The sensor is measuring. The cur-
rent measurement is shown in line 2
(5.20 mg/l in this example).
• Set the desired measuring value
on the first line using the up and down
arrow keys.
• Save the current measurement
setup by pressing OK.
It is generally difficult to conduct a span
calibration. Usually, a reference sensor
is used to verify the measurement. For
non-oxygen solutions, a variation of 1
to 5% between two sensors can occur
(even when the
sensors are placed right next to each
other). Air bubbles on the optical
GB Oxix Manual 1209
5.00 mg/l
5.20 mg/l
OK
104
window will create measurement vari-
ations.
Theory on making oxygen saturated
solution
An oxygen saturated solution can
be made from demineralised water
being oxygenated for a minimum of
30 minutes with atmospheric air. This
saturation can then be calculated into
an oxygen concentration.
The temperature of the solution is
measured with decimal and the atmos-
pheric pressure is measured with mm
Hg.
The ppm or mg/l value of the saturated
solution at the given temperature can
then be decided by using a matrix.
FW: 841013-009, 846001-002, 841513-009
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