Stratos Multi E401N
103
6.2.5 Calibration Mode: Manual
During calibration with manual entry of buffer values, the sensor is immersed in one, two, or three
buffer solutions. Stratos Multi displays the measured temperature. The temperature-corrected buffer
values must then be manually entered. For this purpose, take the buffer value that goes with the
displayed temperature from the buffer table (e.g. on the bottle). Intermediate values must be
interpolated. All calibration data are converted to a reference temperature of 25 °C/77 °F.
Calibration Procedure
NOTICE!
Use only new, undiluted buffer solutions that are part of the configured buffer set.
Calibration
[I] [II] … pH
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 “Manual” calibration mode and press
enter
to confirm.
✓
Number of calibration points configured as in
Cal Presettings
.
Calibration Presettings, p. 68
02.
If required, change the number of calibration points.
03.
Enter the first buffer value.
04.
Continue with the
right softkey: Next
.
05.
Take the sensor out of the medium and rinse it well in deionized water.
CAUTION! Risk of electrostatic discharge.
Do not wipe the sensor or dab it dry.
06.
Immerse the sensor in the first buffer solution.
07.
Start calibration with the
right softkey: Next
.
✓
Calibration with first buffer is carried out.
The following parameters are displayed: Sensor voltage, calibration temperature, nominal
buffer value, 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.
08.
For one-point calibration: Exit calibration by pressing the
softkey
.
09.
For two-point calibration: Rinse the sensor well with deionized water.
10.
Immerse the sensor in the second buffer solution.
11.
Enter the second temperature-corrected buffer value.
12.
Start calibration with the
right softkey: Next
.
✓
Calibration with second buffer is carried out.
13.
Proceed as for one-point calibration.
14.
For three-point calibration, the process uses the third buffer accordingly.
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.
