Dissolved oxygen
MIQ/IDS
34
ba77277d01
01/2024
6.2.5 Reactivating a valid calibration
The FDO
®
925
enables you to reactivate the last valid calibration or the factory
calibration. Thus you can immediately continue to measure if a calibration failed
or you suspect that the calibration conditions were not optimally met.
Reactivating the cal
-
ibration data
6.3
Settings
Making the settings
Using
<S>
, switch from the measured value display to the main menu of the
settings. Then navigate to the setting menu of the sensor. The procedure is
described in detail in the IQ S
ENSOR
N
ET
system operating manual.
The calibration history is stored in the sensor.
The calibration history shows the calibrations of the sensor with the
mounted sensor cap.
Reactivating old calibration data is a temporary measure. Take into
consideration that the sensor may provide wrong measured values.
Ensure the correct functioning of the sensor by checking and/or
recalibrating it.
1.
Open the setting menu of the sensor (see section 6.3).
2.
In the
Calibration
menu, select the setting
User calibration
or
Factory
calibration
and then exit the setting table with
Save and quit
.
Setting
Selection/Values
Explanation
Measuring mode
Concentration
Saturation
Unit of the measured value in the measured
value display.
Measuring range
Con
-
centration
0 ... 20.00 mg/l
0 ... 20.00 ppm
Measuring range
Satu
-
ration
0 ... 200.0 %
The measuring range is permanently set.
Response time t90
30 .. 300 s
Response time of the signal filter.
Depending on the sample matrix, the mea
-
sured values may fluctuate more or less.
A signal filter in the sensor reduces the limits
of variation of the measured value. The signal
filter is characterized by the
Response time
t90
. This is the time after
which 90 % of a signal change is displayed.