Inline process refractometer


PDF data sheet
  • Permanent real-time concentration measurement
  • Sample temperatures up to 150 °C
  • Configurable digital switches
  • User defined scales programmable
  • Liquid based or ultrasonic cleaning devices
Automatically operating process refractometers

The automatically operating process refractometers iPR FR² (Full range) measure the refractive index continuously and thus, the concentration of a binary or quasi-binary liquid mixture. The measurement is independent of light intensity from the light emitting diode (LED) and is free of signal drift, granting high precision and better process control. Colour, turbidity, undissolved particles or gas bubbles do not affect the measurement. You can choice from 2 wide measuring ranges.

The refractometer iPR FR² is a stand alone process sensor with integrated, iluminated display , which does not require an external electronic unit. Its special design and electronic configuration makes it highly flexible and very easy to operate. The programming with a Windows software is also very easy. Optional a Data Logger is available.

The stainless steel measuring head is:

  • IP69K protection class tested by TÜV!
  • resistant against chemicals
  • suiting food regulations and
  • CIP conform (pipe pig use possible)

The iPR measuring head can be installed in pipes, reactor vessels, mixing tanks, kettles, boiling pans and evaporators, using different weld-in flanges.


Main specification

Measuring range B1: 1.3320 - 1.5300 / 0 - 100 Brix
Resolution 0.00001 nD
0.01 Brix
Precision ± 0.00007 nD
±0.05 Brix (at 20 °C)


Ambient temperature 0 °C - 45 °C
Process Temperature (max.) + 80 °C without water cooling
+150 °C with water cooling installed
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 2 insulated 4-20 mA analog outputs
2 digital outputs (limited switches, 1 Ampere)
serial output, RS 232 or 422 or USB
Prism cleaning Optional: water, steam or ultra sonic cleaning
Ex-proof version Yes, ATEX Klass Ex II 1G Ex ia II C T4

Do you have questions about this product?

Get in touch with us.

Dear valued customer and business friend,

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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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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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