Product Overview; Safety - Vaisala PR-23 Series User Manual

2. Product overview
The PR‑23 in‑line 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
1 Sensors
2 Interconnecting cables
3 Indicating transmitter
The in‑line refractometer sensor (1) measures the refractive index n
the process medium. This information is sent through the interconnecting cable (2) to the
indicating transmitter (3). The indicating transmitter DTR calculates the concentration of the
process liquid based on the refractive index and temperature, taking predefined process
conditions into account. The output of the DTR is a 4 to 20 mA DC output signal
proportional to process solution concentration. Process data can also be downloaded to a
computer through an Ethernet cable.
The password for PR‑23 is:
7 8 4 5 1 2
2.1 Safety
This product has been tested for safety. Note the following precautions:
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Chapter 2 – Product overview
P OWE R
PROCESS INSTRUMENTS
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and the temperature of
D
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