Pulp & paper

Vaisala K PATENTS® SAFE-DRIVE Process Refractometers and Digital Divert Control Systems provide black liquor and green liquor dry solids content and density measurements and recovery boiler safety in the kraft chemical (sulfate) and chemi-mechanical pulp production processes. The dissolved solids content (TDS) measurements of fiber suspensions allow to optimize the brown stock washing process in fiber line. Refractometers also ensure the right concentration of sizing liquids in the preparation and use in paper making.

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Refractometer applications

Explore all refractometer applications in pulp & paper 

Library of downloads and software

Here you will find product manuals, approvals and test certificates, material safety data sheets (MSDS) and software for connectivity and communications.

What is process refractometer

Vaisala K-PATENTS® Process Refractometers are used for in-line liquid concentration measurements enabling advanced and accurate process control supporting industrial automation.

Learn more about the principle, technology, and measurement behind a refractometer; refractive index.

Frequently asked questions

Here you will find answers to the most typical questions regarding the process refractometer.


Vaisala and our authorized Liquid measurements distributors offer comprehensive customer care covering the entire lifecycle of Vaisala K‑PATENTS refractometers, and provide application support. See our refractometer service offering from this page.