VAISALA
Vaisala Refractometer – genuine refractive measurement device for precise and reliable quality control in industrial production.

Liquid concentration
mearsurement
Liquid measurement with inline
process refractometers
Vaisala Polaris process refractometers are used for inline liquid measurements to enable efficient process control and industrial automation. They are stand-alone and smart devices that measure and indicate concentration units and diagnostic information. They provide 4-20 mA or Modbus RTU outputs to connect directly to the control system. All process refractometers can also be connected with the Indigo520 for process refractometers for physical user interface and expansion of features.
The Vaisala Polaris refractometers represent the latest, 5th -generation product line. Process refractometers became part of Vaisala in 2019, following the acquisition of K-PATENTS, a leading innovator with over 40 years of experience in designing and manufacturing industrial process refractometers to cater to a wide range of applications.
Our significant investments in research and development have earned us global recognition for delivering innovative, dependable, and top-quality products.

Accurate, drift-free measurements for liquid concentration
Vaisala Polaris process refractometers are widely utilized to determine liquid concentration or density. This measurement has been an important element in the processing industries for over a century. Our advanced digital refractometer technology can significantly enhance the performance of refining, manufacturing, and quality control operations.
Real-time concentration measurements obtained through our inline refractometers can be used as a valuable predictive tool for achieving optimal final concentration. A quick and accurate response is needed to optimize production. Cost reduction is possible by reducing the variation of mean average of the product concentration. The cost saving is related to the value of the component being measured.
Customer Reviews
“The measurement is reliable and stable despite of heavy membrane vibration.”
– Whey protein concentrate plant, New Zealand
“Our annual waste at filling line was million liters. Replacing volumetric flow and turbidity meters with in-line refractometers, helped us to cut the changeover time to a legal minimum of 5 min, reducing waste by two thirds.”
– Dairy, Europe
“Real-time process refractometer is a great alternative to titrators saving time and materials”.
– Pharmaceutical plant, Austria
Full system of Indigo520 transmitter and process refractometer
The Vaisala Polaris paired with the Indigo520 transmitter for process refractometers makes an impressive duo, offering compelling features to suit all users. Indigo520 enables data logging, prism wash control, adjustment of settings and measurement parameters, and Indigo service updates.
The Indigo520 for process refractometers offers versatile system connectivity by two selected analog or digital inputs for process refractometers and other Indigo-compatible probes, four configurable analog outputs to alarm relays, and Modbus TCP/IP digital protocol.
Indigo520 for process refratometers
Completely digital measurement principle based on physics
Measure concentrations of sugars/Brix, acids, alkaline solutions, alcohols, hydrocarbons, solvents, and various other solutions directly in pipelines and tanks, in production transport and perform quality control in sugar, chemical, petrochemical, and other industries.
Vaisala K-PATENTS DD-23 system includes two K-Patents SAFE-DRIVE Refractometer PR-23-SD sensors in the main black liquor line, and two Indicating transmitters and a Divert control unit in an integrated panel. Remote monitoring, and event data logging is via Ethernet.
- Industrial Heat
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Measurement & Automation
- VEGA
- JUMO
- Optris
- KEM Flow Measurement
- Vögtlin
- Schmidt Technology
- Meister
- VAISALA
- CANTY
