Choosing the installation location - PR53 - PR53AC

Follow these instructions when choosing the correct installation location for the process refractometer. The correct location ensures that the prism stays self-cleaning and that the lifecycle of the device is not decreased.

• If the temperature varies along the process pipe, select the position with the highest process temperature. This minimizes the risk of prism coating, because higher temperature means higher solubility and lower viscosity.
• If the process pipe diameter varies, select the position with the smallest diameter (and highest velocity). This keeps the prism cleaner.

Recommended mounting locations

Location	Notes	Image
Outer pipe bend	There is sufficient process flow to the prism that keeps the prism clean. When the process is emptied, no process liquid remains on the prism.
Vertical pipes	Prevents gas or sediment that may affect the measurement from accumulating on the prism surface. When the process is emptied, no process liquid remains on the prism.
Horizontal pipe (pipe side)	Use horizontal pipe installation only if there are no other options. Do not install on the top or bottom of the pipe.
Tank or vessel	Install close to a stirrer. Do not install to a tank or vessel with a scraper that touches the tank or vessel walls.
Feedback control loops	Make the lag time short. Install close to the dilution point. Make sure the process liquid has mixed properly at the measurement point.