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Planning the installation
PR53 product overview
The PR53 inline refractometer is an instrument for measuring liquid concentration in the
process line. The measurement is based on the refraction of light in the process medium, an
accurate and safe way of measuring liquid concentration.
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Figure 1 Refractometer equipment
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Vaisala Polaris ™ Process Refractometers
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Interconnecting cables
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Vaisala Indigo520 Transmitter (optional)
The inline process refractometer (1) measures the refractive index (RI) and the temperature of
the process medium. Using a pre-defined concentration model, the refractometer uses the
measurement data to calculate the concentration. The output value can be read directly from
the refractometer through the configurable integrated analog output channel, or through the
Modbus RTU interface. Alternatively, the refractometer can be connected to the optional
Indigo520 Transmitter (3) using the interconnecting cable (2).
Indigo520 is a configurable transmitter, containing 4 configurable analog output channels, 2
binary contact control relays, Modbus TCP/IP output, a web server, and a graphical touch panel
display. The current values and trend data can be read from Indigo520, which also contains a
local data logger. One or two refractometers can be connected to one Indigo520 transmitter.
For service purposes, the PR53 refractometer can be connected to a PC using a USB adapter
and Vaisala Insight software.
Installation safety
This product has been tested for safety. Note the following precautions:
WARNING!
hot, cold, caustic, or otherwise hazardous liquids. When installing or removing
the refractometer from the process, use personal protective equipment (PPE)
adequate for the process medium and according to the requirements of the
installation site.
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Process refractometers may be installed in processes that have
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M212931EN-C
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