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• 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 the optimal self-cleaning properties, install the refractometer in a 10 °
downwards angle.
Installation environment
Follow these guidelines to ensure the best operating environment for the process
refractometer:
• Install the refranctometer indoors or outdoors. In outdoor installations, protect the device
from exposure to sunlight and rain.
• If the pipe is translucent, protect the prism from light. Outside light may disturb the
measurements.
Details
• There is sufficient process
flow to the prism that keeps
the prism clean.
• When the process is emptied,
no process liquid remains at
the prism.
• There are no excess gas
bubbles or sediments
damaging the prism.
• When the process is emptied,
no process liquid remains at
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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