• Permanent real-time concentration measurement
  • Highest resolution and precision
  • For applications with very low solid concentrations
  • Stand-alone sensor with integrated electronic
  • Configurable digital switches

Fully automated process refractometer with very high resolution

The automatically operating process refractometers iPR HR² (High Resolution) measure the refractive index continuously and thus, the concentration of a binary or quasi-binary liquid mixture.

They are especially develops for the check of liquids with very low solid concentrations (e.g., Light drinks). iPR HR² own a high resolution and precision.

The refractometer iPR HR² 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!
  • against chemicals
  • suiting food regulations
  • 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.


  • Pharmaceuticals
  • Nutraceuticals
  • Diet beverages
  • Salinity
  • Low concentration residues in condensates

Main specification

Measuring range1.3320 – 1.3720 / 0 – 25 Brix
Resolution0.000005 nD / 0.002 Brix
B2: 0.00002 nD / 0.02 Brix
Precision±0,00004 nD
±0,02 Brix
(±0,01 – 2% Brix at 20 °C)


Ambient temperature0 °C – 45 °C
Process Temperature (max.)+ 80 °C without watercooling
+100 °C with water cooling installed
Process Temperature (min.)-10 °C
Process pressure (max.)1 Mpa (145 psi, 10 bar)

Additional information

Wetted partsYAG, stainless steel
optional: PTFE
Protection classIP 69 K tested
TÜV Rheinland
Light source/wavelength589 nm LED
Power supply24 VDC
Interfaces, switches2 insulated 4 – 20 mA analog outputs
2 insulated 4 – 20 mA analog outputs
2 serial outputs RS232 or RS 422 and USB
Prism cleaningOptional: water, steam or ultra sonic cleaning
Ex-proof versionNo