The sanitary process refractometer PR‑43‑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 refractometer, 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 80 mm (3 in) or bigger, a ferrule is welded directly to the pipe wall. A ferrule, length 21.5 mm (0.85 in), is delivered with standard refractometer delivery from Vaisala).
Flow cells are available for smaller pipe diameters. The following figures show the flow cells for smaller pipe diameters. The flow cells are exchangeable with standard 90° bend pieces.