ATR L Dispersion Refractometer

Multi-wavelength Measurements

SCHMIDT + HAENSCH is proud to present a robust, multi-wavelength refractometer, capable of performing simple dispersion measurements at seven wavelengths over the full visible range. The digital, fully automatic spectral refractometer ATR L consists of an electronic unit separated from the robust stainless steel measuring unit.

ID-N° 03751


  • Measurement of solid samples possible
  • Automatic dispersion measurement
  • Seven wavelengths fixed with full range of visible light
  • Automatic measurement of Abbe-number
  • Ideal for research and development
  • Able to discriminate ingredients with the same refractive index
  • Powerful, internal Peltier temperature control guarantees the fastest measurements with highest accuracy

Easy to Use

A sample volume of 0.3 mL is sufficient for high precision measurements.

The variety of sample compartment lids allows for the measurement of both solid and liquid samples. The refractometer is equipped with a Peltier thermostat for on-point sample tempering.

Different combinations of customer-specified wavelengths are available.




The SCHMIDT + HAENSCH multi-wavelength refractometer ATR L can be used for the determination of product purity, hence it is ideally suited to control sample quality. Moreover, the material characterization can be used to identify high quality products like perfumes, wine, or other alcoholic beverages. As the instrument can measure solid samples, the quality control of hydrophobic and hydrophilic intraocular lenses (IOL) is possible.

As the measurement principle is also sensitive to absorption, the measurement not only delivers information about content of analyte but it also provides valuable information regarding color and turbidity. Further applications in R&D, medical research, plastic lenses, contact lenses, proteins, communication technology, polymer materials, special optical liquids, glasses and glues are possible. In the petrochemical industry ATR L can perform valuable services in scientific research and standard ASTM measurements.

Product in depth

This digital multiple wavelength refractometer of SCHMIDT + HAENSCH is based on CCD-sensor detection of the critical angle of total reflection. This is done sequentially for all LEDs (colors) and displayed as refractive indices according to these wavelengths. SCHMIDT + HAENSCH has the necessary data basis for calibration of such an instrument through research performed in-house.



Measuring scalesRefractive index (RI)
Measuring range1.33200 – 1.70000 RI* / 100% Brix
Resolution0.00001 RI* / 0.01 Brix
Precision± 0.00004 RI* / ± 0.03 Brix
Reproducibility± 0.00004 RI* / ± 0.03 Brix
Measuring time per sample20 sec for all 7 wavelength after temperature stabilisation; single sample measurement
Ambient temperature+ 15° to + 40°C
Automatic temp. compensation Operational temperature Temperature stability
Temperature precision
Solid state Peltier-thermostatisation
+ 10°C to + 80°C
± 0.03°C
DetectorCCD-linear array with 2048 elements
Sample compartmentUsed materials: stainless steel, Black Delrin®, Teflon®, Viton®, FFKM sealing
Light source / wavelength7 discrete LED’s with fixed wavelengths 400, 450, 490, 545, 590, 660, 700 nm (others on request), wavelength accuracy ± 2 nm
DisplayLCD, 16 x 16 characters, back illuminated
Operation20 key membrane including function keys
Interfaces /Communication1 x RS232 C, 1x parallel, USB optional
StandardsEuropean and international Pharmacopoeia, various ASTM, ISO and DIN standards
Dimensions / WeightMesuring head, stainless steel: 260 x 190 x 220 mm (w x h x d); control unit: 220 x 110 x 290 mm (w x h x d); complete unit 8 kg



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