RI adjustment - PR53 - PR53AC - PR53AP - PR53GC - PR53GP - PR53M - PR53SD - PR53W

PR53 Series User Guide

Document code
M212898EN
Revision
E
Language
English
Product
PR53
PR53AC
PR53AP
PR53GC
PR53GP
PR53M
PR53SD
PR53W
Document type
User guide

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.

  1. Perform RI calibration in the RI calibration menu. Alternatively, retrieve calibration data from a previously stored calibration by selecting Retrieve stored calibration.
  2. Verify from the retrieved calibration date that the RI calibration data is available and recent.
  3. 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.

  4. 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.