iPR Compact² Inline
Process Refractometer

  • Precise, fast and reliable
  • Permanent real-time concentration measurement
  • Compact sensor
  • Galvanic isolated 4 – 20 mA output
  • Excellent price-performance ratio

NEW – Now with extended measuring range!

The iPR Compact² is a compact inline refractometer with extremely short response time for continuous measurement and real-time process control with analog measured value output. It is characterized by its minimal size and weight and has an excellent price-performance ratio.

The iPR Compact² allows inline, real-time refractive index measurement, Brix, or concentration to monitor and control the concentration of substances in solution or liquid mixtures in the process. The compact stainless steel measuring head with YAG prism is equipped with an integrated electronic for connection to a PC or control room.

Available in two versions (aluminum and stainless steel) with different process temperatures ranges.



  • Mixing ratio determination
  • Quality and concentration control of dissolved solids
  • Detection of product transitions
  • Determination of the concentration and degree of contamination of cooling lubricants and cleaning solutions

Main specification

Measuring range 1.3320 – 1.4535 nD
0 – 65 Brix
Resolution 0.0001 nD
0.05 Brix
Precision ± 0.0002 nD 
±0.15 Brix (at 20 °C)


Ambient temperature 0 °C – 45 °C
Process temperature (max.) Aluminum: +60 °C
Stainless steel: +80 °C
Process temperature (min.) -10 °C
Process pressure (max.): 1 Mpa (145 psi, 10 bar)

Additional information

Prism YAG
Wetted parts YAG, stainless steel
optional: PTFE
Protection class IP 69 K tested
TÜV Rheinland 
Light source/wavelength 589 nm LED
Power supply 24 VDC
Interfaces, switches 1 insulated 4-20 mA, ( Brix 0 – 50 with ATC)
1 digital output/limit switch serial outputs RS232, RS422 and USB
Prism cleaning Optional: water, steam or ultra sonic cleaning
Ex-proof version No