Overview of concentration measurement - 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

The concentration measurement is organized in 6 layers.

Figure 1. Concentration measurement layers
1
Light area information comes from the CCD element and temperature information from Pt-1000 temperature element. The position of the shadow edge is light area and scaled 0–100 %.
2
RI adjustment: The actual refractive index RI is calculated from the light area. The temperature is calculated from the Pt-1000 resistance. The RI measurement of each refractometer can be verified using standard nominal reference liquids.
3
Concentration curve: The refractometer calculates raw concentration from RI and temperature according to the chemical curve. The result is a temperature-compensated raw concentration value.
4
Field adjustment: Adjustment of the raw concentration value may be required to compensate for some process conditions or to fit the measurement to the laboratory results. The field adjustment parameters are used to convert raw concentration into adjusted concentration. The adjusted concentration is called concentration. If there is no adjustment, raw concentration and adjusted concentration are equal.
5
Damping: You can apply signal damping to diminish the influence of process noise.
6
Output signal: The range of the 4–20 mA signal is defined by the range of the particular concentration curve.