• 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 rangeB1: 1.3320 – 1.5300 / 0 – 100 Brix
Resolution0.00001 nD
0.01 Brix
Precision± 0.00007 nD
±0.05 Brix (at 20 °C)


Ambient temperature0 °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

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 digital outputs (limited switches, 1 Ampere)
serial output, RS 232 or 422 or USB
Prism cleaningOptional: water, steam or ultra sonic cleaning
Ex-proof versionYes, ATEX Klass Ex II 1G Ex ia II C T4