Each refractometer has their own unique RI
adjustment curve that has been calculated at the Vaisala factory. These are the A
parameters.
| Only trained personnel should perform RI adjustment as a service procedure. Adjusting
how the refractive index is calculated changes the way concentration is measured. If
adjustment is done wrong, the refractometer can start measuring concentration
incorrectly. |
In order to perform RI calculation
adjustment, you need to calibrate at least five calibration points that all have a different
Nominal RI. You can do this in the RI calibration menu. Vaisala recommends that you perform RI adjustment based on a recent
calibration.
-
Perform RI calibration in the RI calibration menu. Alternatively, retrieve calibration data from a previously stored calibration by
selecting Retrieve stored calibration.
-
Verify from the retrieved calibration date that the RI calibration data is available
and recent.
-
Select Start adjustment.
Refractometer calculates new RI
calculation parameters. New parameters and maximum difference are shown on the top half
of the screen.
Maximum difference is the greatest
refractive index difference value calculated from the available calibration points when
using new RI calculation parameters.
-
If you are satisfied with the new RI calculation parameters and maximum difference
result, select Yes.
The new calculation parameters are
applied immediately. The refractometer reboots after the new parameters are applied.