The standard refractive index range of a PR‑23
sensor is 1.320 … 1.530 (corresponds to 0 … 100 Brix), shown in the following figure.
Figure 1. PR‑23 rangeability
The refractometer models PR‑23‑M/MS and
PR‑23‑W for aggressive solutions and ultra-pure fine chemicals can be equipped with a sapphire
prism with a refractive index range 1.2600 … 1.4700, shown in the following figure.
Figure 2. PR‑23‑M/MS/W rangeability with a
sapphire prism (74) and with a standard prism (73)
The refractometer model PR-23-SD for pulp and paper industry can be equipped with a sapphire
prism with a refractive index (nD) range 1.3600 … 1.5700, shown in the following figure.Figure 3. PR‑23‑SD rangeability with a sapphire prism (73 and 72)
