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PR21S and PR21S-T

Inline process refractometers

Accurate results for automatic and continuous process control

The inline process refractometers PR21S and PR21S-T are installed in pipelines of production facilities in order to control and regulate the concentration, mixing and fermentation processes. Thanks to the standardised connections, the measurement devices can be easily installed in pipelines. The measuring chamber is made of stainless steel, the measurement prism consists of scratch-resistant and especially chemical-resistant sapphire and is designed to prevent solids from sticking.

  • Determination of the refractive index directly in the line within a range of nD 1.3200–1.5200 and 0–95 %Brix
  • Measurement intervals from 3 to 60 seconds selectable
  • Automatic temperature compensation (%Brix and freely definable for customer-specific products)
  • Integrated sensor for temperature monitoring
  • User-defined scales
  • Stainless steel measurement chamber that meets all the requirements of the food and pharmaceutical industry, CIP/SIP capable
  • Sample prisms, made of scratch-proof and chemical-resistant sapphire
  • Cleaning via process cleaning processes
  • PR21S-T model can be coupled with water cooling and is suitable for process temperatures up to 120 °C
  • Easy connection with process control system or MPC via analogue outputs (0/4-20 mA)
  • Display for the visual monitoring is also available

Typical applications for the PR-Series

The process refractometer is the ideal solution for the chemical, petrochemical, automotive, aviation, metal processing, food, sugar, beverage, paper industries as well as wastewater control.

  • Characterisation tests in research and development
  • Identity test, purity control and concentration determination of raw materials, semi-finished products and end products
  • Tracking of chemical processes during production
  • Identity test and concentration determination
  • Outgoing goods inspection
  • Stability test
  • Determination of the sugar concentration
  • Determination of the sugar concentration in semi-finished products and end products
  • Determination of the solids content in solutions
  • Determination of the purity in combination with a polarimeter
  • Routine analysis with high sample throughput
  • Determination of the sugar concentration in juices and alcohol-free beverages
  • Determination of the alcohol or extract content in beer, spices, wine or spirits
  • Quality control of dairy products
  • Sewage water check

For a comprehensive overview of typical applications visit our campus review Refractometer applications.

Model specifications

PR21S PR21S-T
MEASUREMENT DATA
SCALES Refractive index (nD) 
Concentration of sucrose, glucose, fructose and invert sugar [%Brix], 
User-defined
MEASUREMENT RANGE nD 1.3200–1.5200 
0–95 %Brix
MEASUREMENT ACCURACY nD ±0.0002 
±0.2 %Brix
RESOLUTION nD 0.0001 
0.1 %Brix
MOUNTING Atline
MEASUREMENT PERIOD 3–60 s
MEASUREMENT PRISM Sapphire
LIGHT SOURCE LED
WAVELENGTH 589 nm
TEMPERATURE DATA
TEMPERATURE COMPENSATION ICUMSA or freely definable
TEMPERATURE MEASUREMENT With integrated temperature sensor Pt100
TEMPERATURE MEASUREMENT RANGE 10–120 °C
TEMP. MEASUREMENT ACCURACY ±0.2 °C
TEMP. MEASUREMENT RESOLUTION 0.1 °C
PROCESS TEMPERATURES 10–60 °C 10–120 °C
AMBIENT TEMPERATURE 0–60 °C
FURTHER SPECIFICATIONS
IP CODE IP65
OPERATING VOLTAGE 24 V (18–30 V)
POWER CONSUMPTION (MEASUREMENT OPERATION) 5 W without display, 6 W with display
DIMENSIONS (W X H X D) 180 mm x 190 mm x 180 mm
WEIGHT 3.5 kg
SPECIAL FEATURES . Water cooling

Technical data process refractometers (PDF, 309 KB)

Digital refractometers with peltier temperature control

Resources & Downloads

PR21S and PR21S-T4 Enquiry

For more information or to arrange a call from one of the Cea Analytical Team, please complete the contact form below.  If your enquiry is urgent, please call us on 1300 552 725.

PR21S and PR21S-T Enquiry

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