The sanitary process refractometer PR‑23‑AC is connected to the process by a 2.5 in sanitary clamp. The recommended mounting is in a pipe bend, with a vertical flow upwards before the sensor, and a horizontal pipe after. This mounting enables the following:
- Self-cleaning of prism due to the flow directed against its surface.
- Efficient drainage when the pipe is emptied.
For pipe diameters of 3 in or above, a ferrule is welded directly to the pipe wall (a ferrule, length 21.5 mm, is delivered with standard sensor delivery from Vaisala).
For smaller pipe diameters, flow cells are available from Vaisala, see Figure 2, Figure 3, Figure 4 and Figure 5, see also the tables in PR‑23‑AC mounting hardware model code.
The flow cells are exchangeable with standard 90° bend pieces.
