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• 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.
Table 3 Recommended mounting locations
Location
Outer pipe bend
Vertical pipes
Horizontal pipe (pipe side)
Tank or vessel
Feedback control loops
For optimal self-cleaning properties, install the refractometer in a 10 ° downward
angle.
Installation environment
Follow these guidelines to ensure the best operating environment for the process
refractometer:
Notes
• 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.
• There are no excess gas
bubbles or sediments
damaging the prism.
• When the process is emptied,
no process liquid remains on
the prism.
• Use horizontal pipe
installation only if there are
no other options.
• Do not install on the top or
bottom of the pipe.
• Install close to a stirrer.
• Do not install to a tank or
vessel with a scraper that
touches the tank or vessel
walls.
• Make the lag time short.
• Install close to the dilution
point.
• Make sure the process liquid
has mixed properly at the
measurement point.
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