Knick Stratos Multi E401N - Calibration Mode: Product

Stratos Multi E401N
104
6.2.6 Calibration Mode: Product
Calibration by Sampling
If the sensor cannot be removed – e.g., for sterility reasons – its zero point can be calibrated by “sam-
pling”. The currently measured value of the process is saved in the device for this purpose. A sample is
taken directly afterward at the measuring point. The sample’s pH value is measured in the laboratory.
The reference value is entered in the device. Stratos Multi
calculates the sensor’s zero point from the
difference between the measured and reference values. The slope is not changed in the process.
Calibration Procedure
NOTICE! The sample’s pH value is temperature-dependent. The reference measurement should be
carried out at the sample temperature shown on the display. The sample should be transported in a
vacuum flask. The sample’s pH value may also be falsified if volatile substances escape.
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 “Product” calibration mode and press enter to confirm.
02. Prepare for sampling.
03. Start with the right softkey: Next.
Product calibration is performed in 2 steps.
Step 1:
04. Take sample.
✓ The measured value and temperature at the time of sampling are displayed.
05. Save with the right softkey: Save.
Exception: Sample value can be determined and entered on site: Left softkey: Input
Step 2: Lab value has been measured.
06. Open the Product Calibration menu again.
07. Enter reference value ("Lab value").
08. Confirm with the right softkey: Next or repeat calibration with the left softkey: Abort.
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.