Inline process refractometer

iPR Compact²

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

NEW – Now with extended measuring range!

Compact in-line refractometer iPR Compact² with very short response time for continuous measurement and real-time process control with one analogue data output. It’s characterized by minimized dimension and weight and has an excellent price-performance ratio.

The iPR Compact² allows the inline, real-time refractive index, Brix or concentration measurement to monitor and control the concentration of dissolved solids in solution or liquids in process. The compact stainless steel measuring head with YAG Prism is equipped with an integrated electronic for direct connection to supervisory system or PC.

Available in two versions (aluminum and stainless steel) with different process temperature ranges !


Designated market

  • Determination of mixing ratio
  • Quality and concentration control of dissolved solids
  • Interface detection
  • Concentration and pollution of cutting oils and lubricants
  • Concentration and pollution of detergents
  • Control of degreasing and industrial washing machines


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

Do you have questions about this product?

Get in touch with us.

Dear valued customer and business friend,

We are taking all possible measures to secure the health of our employees as well as our customers.

As we have already informed you, Schmidt+Haensch remains fully operational.

We are organising whenever possible work from home offices. Our production lines are continuously producing and our supply chains are so far secured.

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For service issues please do not hesitate to contact us via e-mail to or telephone under +49 (030) 417 072 – 41 / - 42

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We wish you to stay well and healthy.

Let us try to overcome these most exceptional circumstances by looking after each other with the necessary care and distance.

Best regards

Mathis Kuchejda


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