Chemicals & Allied Products

Measuring liquid concentration or density in-line is important in the chemical industry as density variations have impact on both raw materials and finished products. Process safety is also mandatory, since hazardous chemicals represent a potential risk to people and the environment. While managing these challenges, chemical manufacturers strive to produce high-quality products that meet customers’ specifications. To achieve these goals, accurate process measurements, high process efficiency, low energy consumption, and state-of-the-art process control management are crucial. 

In-line measurement of liquid concentration and density directly in chemical process

Vaisala Polaris process refractometer is designed to measure and indicate inline liquid concentration of almost any chemical or compound.

The refractometer can be installed cost-efficiently in the main processing line, bypass line or vessel to control the raw and in-process materials in order to extract their maximum value and achieve high quality end products. The performance of all types of chemical refining, manufacturing, and quality-control operations can be dramatically improved with Vaisala’s refractive index measurement technology – whether they are in continuous or batch processes. 

Unlike intermittent sampling, continuous monitoring provides instant feedback on changes in the process, and this data can enable real-time and precise process control of the common chemical industry operations, e.g.

  • Reactor, reaction degree, and endpoint determination
  • Evaporation
  • Dissolving tank or vessel
  • Dilution, mixing or blending
  • Solid-liquid extraction
  • Absorbers and wet scrubbers
  • Ion exchangers
  • Distillation
  • Interface detection and product identification of product-to-product interfaces in loading/ unloading
  • Quality control

Using the Vaisala concentration measurement technique and its easy integration into plant engineering systems enables significant improvements in the plant capacity, the process safety or product yields.

All you need to know about liquid concentration and density measurements

In this eBook we review two most widely used methods of liquid concentration measurement, i.e. refractive index technology (refractometer) and density (Coriolis, ultrasonic, nuclear, and microwave). 

Learn about the advantages and disadvantages of each technology. 

Download the eBook

Refractive index technique designed for harsh chemical environments and applications

Vaisala Polaris process refractometer offers accuracy, repeatability and reliability even in the most extreme environments that can be corrosive or abrasive, subject to chemically aggressive solutions, extreme temperatures, pressures, vibration or contamination, humidity and dust, or any combinations of these factors.

Polaris PR53AC process refractometer

  • Designed to Pressure Equipment Directive PED 97/23/EC and ASME Section VIII Division 1 - Pressure Vessels
  • Selection of different IP codes (IEC 60529) and NEMA ratings that withstand various harsh conditions and outside use.
  • Special wetted parts materials ranging from stainless steel and higher alloys to PFCF or PTFE (Teflon®) for harsh environments and chemically aggressive process fluids.
  • Intrinsically safe and hazardous area certification for hazardous areas

Vaisala capabilities and services for the chemical industry applications

Vaisala is specialized in in-line process refractometers and optical process analyzers for refractive index-based concentration measurements. Vaisala instruments range from compact probe models for small pipeline and bypass lines to rugged heavy-duty long probe versions for large pipeline, vessel and reactor installations. When standard models are not sufficient to fulfil requirements, please consult the factory for engineered solutions, e.g. special wetted materials or custom mounting accessories and process connections.

Vaisala also provides full range of start-up, commissioning and technical support services to our customers. Our industry expertise includes supply of extensive vendor documentation that is tailored and applied to each contract and client specific data. Local authorized distributors have extensive applications knowledge and they can help to specify the correct instrument for each application requirements.

All you need to know about in-line liquid concentration and density measurement

Processing industries use liquid concentration or density as a key parameter for controlling and adjusting the process to ensure the desired output. This can be done using the refractometer technology or density meters. What are the operational and economic benefits of both techniques? This and other aspects on how to choose the right measurement technology for the most demanding processing applications will be discussed in the webinar.

Watch webinar

Applications in the chemical industry

The performance of all types of refining, manufacturing and quality control operations can be dramatically improved with our liquid concentration and density measurement technology.
Download our application notes for more information.

Applications in the fiber and textile industries

Read our application notes to streamline your fiber processes, optimize use of materials  and resources and reduce impact of harmful chemicals to the environment and humans. 
Download our application notes for more information.

Liquid concentration measurement in chemical and textile fibers

This eBook can be interesting for chemical and textile fiber fabricators and processors. It provides insights on the most common fiber and textile processes, and explains the role of in-line instrumentation for automatic and precise control of raw materials and solvents in these processes. The process optimization benefits include but are not limited to energy and material savings. Discover more by downloading the eBook.


Applications in other industries & operations

Read our application notes to streamline your other manufacturing processes or operations. 
Download our application notes for more information.

Further reading

Chemicals & Allied Products related products

Vaisala Polaris PR53GP

Vaisala Polaris™ PR53GP Process Refractometer

Measure concentrations of sugars/Brix, acids, alkaline solutions, alcohols, hydrocarbons, solvents, and various other solutions directly in pipeline and tanks, in production transport and quality control in sugar, chemical, petrochemical, and other industries.

Misurazione della concentrazione di liquidi

Vaisala offre un'ampia gamma di prodotti progettati per soddisfare le esigenze di misurazione di liquidi di diversi settori. 
Scopri di più sulla tecnologia del rifrattometro e sulle sue applicazioni e visita la libreria di risorse correlate ai prodotti.

Can't find your application?

Only some examples of our refractometer applications are listed here. There are still hundreds more!

Our application experts will help you. Tell us a bit more by filling the form or contact us.