Stratos Multi E401N
123
6.6.3 Calibration Mode: In Water
Automatic Calibration in Water
The slope is corrected using the saturation value (100 %) related to saturation with air.
Calibration Procedure
Note:
Ensure sufficient sensor incident flow. (see the specifications of the oxygen sensor.)
The calibration medium must be in equilibrium with air. Oxygen exchange between water and air is
very slow. Therefore, it takes a relatively long time until water is saturated with atmospheric oxygen.
If there is a temperature difference between calibration medium and measured medium, you must
keep the sensor in the respective medium for several minutes before and after calibration.
Calibration
[I] [II] … Oxy
When you access calibration, the calibration values selected in the calibration presettings are used.
These settings can still be changed in the Calibration menu. If you do not want to perform calibration,
use the left
softkey
to go back one level and abort the calibration.
01.
Select “In Water” calibration mode.
02.
Take the sensor out of the medium and clean it.
03.
Carefully dab the membrane dry with a paper tissue.
04.
Expose the sensor to the calibration medium (air-saturated water), ensure sufficient incident flow,
and press
enter
to confirm.
✓
Display of selected calibration medium (air-saturated water)
05.
Enter Cal Pressure:
Enter the calibration pressure if “Manual” was configured.
06.
Start with the
right softkey: Next
.
✓
Drift check is carried out.
The following parameters are displayed: Sensor current, calibration pressure and response time.
The time for the measuring voltage to stabilize can be shortened with the
left softkey: Exit
(without
drift check: reduced accuracy of calibration values). The response time indicates how long the sensor
needs until the measuring voltage is stable. If the sensor voltage or the measured temperature
fluctuate considerably or the sensor is inadequately polarized, the calibration procedure is aborted
after around 2 minutes. In this case, calibration needs to be restarted. Return the sensor to the process
once this has been successfully completed. Make sure that the temperature of the sensor and the
temperature of the buffer solution are not too far apart. The ideal temperature is 25 °C/77 °F.
You must re-start the calibration. If successful, replace sensor in the process.
07.
Exit calibration with the
right softkey: Next
.
Result
✔
By pressing the
right softkey: Adjust
, the calibration values obtained during calibration for
calculation of the process variables are applied to the device. When using a Memosens sensors,
the calibration values are saved in the sensor.