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Inline refractometer:

Maintenance-free inline refractive index measurement

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Durable inline refractometer for real-time concentration measurements and production control of raw, intermediate, and final products. Industry-leading optics deliver accuracy up to ±0.0001 nD (±0.05 °Brix). Operation is maintenance-free, with full CIP/SIP capability.

Key features

Maintenance-free – forget servicing and operating costs

Maintenance-free – forget servicing and operating costs

The inline refractometer L-Rix 5000/5100/5200 uses industry-leading optics which dramatically extends the instrument’s service life, increases reliability and safety, and reduces costs. Once adjusted at the factory, L-Rix 5000/5100/5200 operates with the stored adjustment values for its entire lifetime. Benefit from “install and forget” simplicity and years of continuous operation.

Inline and highly accurate – real-time concentration measurement where it matters most

Inline and highly accurate – real-time concentration measurement where it matters most

L-Rix 5000/5100/5200 efficiently handles 0 to 100 weight concentrations and provides refractive index and concentration results comparable to those of laboratory refractometers. It gives you automatic control and monitoring of your process where this matters most.

Robust – for minimized downtime

Robust – for minimized downtime

As it is not influenced by potential stray light L-Rix 5000/5100/5200 delivers robust measurements under process conditions. Once CIP/SIP routines are completed, the sensor reactivates in just minutes to minimize downtime. 

Plug and play – easy setup with maximum compatibility

Plug and play – easy setup with maximum compatibility

No special training is required to set up and operate the instrument. L-Rix 5100/5200 is set up quickly and easily using the touchscreen interface of the built-in evaluation unit, via the Pico 3000 software, or mPDS 5 evaluation unit, while L-Rix 5000 comes ready with analog outputs and can be configured with the Pico 3000 software.

The sensors provide user-friendly diagnostics based on standard status categories according to NAMUR NE 107. Modular and expandable, L-Rix 5100/5200 can be easily adapted to support several communications protocols including analog (4 mA to 20 mA), Modbus RTU, Modbus TCP, HART, PROFIBUS DP, PROFINET IO, and EtherNet/IP.

Technical specifications

  L-Rix 5000/5100 L-Rix 5200
Refractive Index

Range 1.3100 to 1.5400 
(equivalent of 0 % mass to 100 % mass)

nD ±0.0002 (equivalent to ±0.1% mass)

nD ±0.0001 (equivalent to  ±0.05 % mass)

Range 1.3100 to 1.4600
(equivalent to 0 % mass to 65 % mass)

nD ±0.0001 (equivalent to ±0.05 % mass)

nD ±0.00005 (equivalent to ±0.025 % mass)

Calibration Anton Paar’s proprietary calibration routine using high-purity water and commercial nD references
Materials of the optics Sapphire
Detector CMOS line sensor; 2048 elements
Light source LED 589 nm
Temperature control method Automatic temperature compensation; Integrated Pt-100 
Ambient temperature range -20 °C to 60 °C
Process temperature

-20 °C to 105 °C (L-Rix 5200)
-20 °C to 120 °C (L-Rix 5100)

CIP/SIP up to 145 °C (293 °F) for 30 min
(at max. ambient temperature)

Pressure range absolute 100 mbar to 16 bar (10 bar @ >120 °C)
Weight approx. 7 kg
Process wetted parts, standard

Stainless steel 1.4404
Sapphire (Al2O3 – 99.997 %) 

Enclosure protection IP65; IP67 / NEMA 6P
  • Analog
  • Analog/Digital
  • HART
  • Modbus RTU
  • Modbus TCP
  • EtherNet/IP
Process connections Tuchenhagen VARIVENT® Type N
Tri-Clamp® 3‘‘

* Valid for process temperatures between 3 °C and 25 °C

Anton Paar Certified Service

The Anton Paar quality in service and support:
  • More than 350 manufacturer-certified technical experts worldwide
  • Qualified support in your local language
  • Protection for your investment throughout its lifecycle
  • 3-year warranty
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