760
i.e. ------ = Barometric correction coefficient = 1.216
625
1.05 = Stirring effect or oxygen depletion coefficient standard value (5%)
1.05 x 1.216 = 1.2768 Total coefficient to be applied.
Note
The latest probe firmware release takes one further step forward in the simplification of the dissolved oxygen sensor
calibration by introducing the automatic calculation of the barometric pressure compensation using an algorithm
which calculates the coefficients depending on the altitude. The above procedure is therefore replaced by:
Oxygen correction coefficient for
1 - Barometric pressure deviation from the 760 mmHg
2 - Stirring effect on the sensor
Enter Altitude above sea level [m]:0
The operator must enter the elevation above sea-level in meters. Afterwards, the probe calculates by
itself the new correction coefficient. The new coefficient is then shown for the operator’s approval.
New correction coefficient:1
The new coefficient can be approved or modified. In the latter case, the rules explained above are still
valid.
5.5.5 pH sensor calibration
The pH sensor calibration is carried out using a single buffer solution: pH7. A second buffer pH4 can
be used, to verify the calibration and the good state of the sensor. After the “pH sensor” has been
selected from the list of sensors to be calibrated, the operator must enter the pH buffer value (in pH
units) which he intends to use during the pH calibration.
pH Sensor calibration
pH buffer value : 7.0
Afterwards, the following message appears:
pH Sensor calibration
Place the buffer cup
Type any key to continue, <ESC> to abort
Pull out the calibration buffer cup from the accessory kit and fill it with the pH7 buffer solution. The
buffer cup has been designed to simultaneously fit over the pH and reference sensors and should be
placed under these sensors with the probe in its vertical position (sensor looking at the floor). When the
preparation is complete, press any key to continue. In case of trouble, type <ESC> to abandon the pH
sensor calibration.
The following message appears:
pH calibration in progress
Calibration statistics
Sensor offset — Drift Temperature
0.09 pH 0.09 pH 0.76 mV 19.679
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