Vaisala Polaris™ PR53AP Sanitary Probe Process Refractometer

Measure Brix and other liquid concentrations with instant productivity and material gains, and simplified process operation for food and beverage manufacturing, dairy and brewery, including OEMs.

By choosing the long probe Vaisala Polaris PR53AP sanitary probe process refractometer you choose to buy a reliable, modern and modular product platform that is safe to use in food and beverage manufacturing, has 3-A and EHEDEG certifications and meets all hygienic demands.


The PR53AP model is suitable to use in high heat, with scrapers and mixers and in sticky process conditions. It is also compatible with clean-in-place (CIP) and sanitation-in-place (SIP) systems. Connectivity options include mA, HART, and Modbus RTU as a standard. 

Key benefits

3-A Sanitary and EHEDG certified

Hygienic certification guarantees that all hygienic demands are met, and sanitary features are woven into the product design. The product is safe and suitable to use in food and beverage processing.

Full measurement range

The measurement range for concentration/Brix is 0-100 %.

Always accurate, no drift

The measurement is based on optical measurement of the refractive index (RI). The RI can be measured from practically any liquid or slurry, and it is sensitive to dissolved material. Bubbles, particles or color do not affect the measurement. 

Customizable product with our Engineer to Order service

In addition to wide standard process connection offering, Vaisala offers an opportunity to customize the product to meet specific processing needs whether it is a special process connection, wetted parts material, custom size flanges or custom type enclosure for transmitters (Ex d/Ex p).

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Easy installation, easy and low maintenance

Convenient installations directly to different size process pipes with standard sanitary and Variline couplings, or with a sanitary flow cell with measurement data incorporated to control system. Vaisala also offers miniature flow cell for bypass lines or sample lines, suitable for example in pharmaceutical manufacturing.

Process refractometers are easy to install and low maintenance instruments. The optical measurement principle combined with an instrument with zero moving parts does not require regular maintenance. 

Outstanding durability

The outstanding long-term stability and the measurement principle with no moving parts provides years, even decades of accurate, continuous, fast and stable measurement for concentration of sugar (Brix) and various other chemical concentrations directly in the process stream.

Inline Brix measurement for food and beverage process monitoring


Sanitary compact process refractometer

For sanitary compact probe option, visit: 


Product resources

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