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Digital Refractometer

The Rudolph Research J257 Wide Range Refractometer was developed by working together with laboratory refractometer users from the polymer, petroleum, petrochemical, pharmaceutical and essential oil industries. The J257 is a fully Automatic, Digital Refractometer, featuring electronic cooling and heating with an extended Refractive Index (RI) measurement range. The J257 is part of the Rudolph Research Rudolph Research Refractometer Product Line.

  • Specifications
  • Test Methods
  • DOWNLOADS
  • In Actions
  • Measurement Scales: Refractive Index (RI) BRIX (% sucrose) Temperature Corrected BRIX Temperature Corrected RI 100 User Programmable Scales
  • Measurement Range: 1.26 – 1.72 RI, 0 – 100 BRIX
  • Resolution: Refractive index ±0.0001(Standard), ±0.000001 (Optional) 0.01 BRIX
  • Reproducibility: ±0.0001 RI, ±0.1 BRIX
  • Accuracy: ±0.0001 RI, ±0.1 BRIX
  • Optical Wavelength: 589.3nm (other wavelengths available)
  • Prism: Industrial Sapphire
  • Light Source: Light Emitting Diode (est. life: >100,000 hrs.)
  • Response Time: Continuous readout or user programmable delay (i.e. a 25ºC sample can be cooled to 20ºC and measured in 20 seconds)
  • Communication Interface: 3 USB RS232 ports Cat5 Network (Ethernet)
  • Analog Control: 0-10 volts, 4-20 mA
  • Temp. Control Range (within 10C of ambient): 5ºC – 100ºC *other temperature control options are available
  • Temp. Sensor Accuracy: ±0.05ºC
  • Ambient Temp. Limit: 5ºC – 40ºC
  • Temp. Correction Range: 4ºC – 95ºC (for pure sucrose solutions)
  • Temp. Control: Prism surface and presser
  • Calibration: 1, 2 or full multi-point calibration
  • Operating Dimensions: L: 15.25″ W: 10″ H: 4.5″ / 23 lbs.
  • Shipping Dimensions: L: 26″ W: 21″ H: 16″ / 30 lbs.
  • Power Requirements: 100-240 volts, 50 Hz – 60 Hz
  • Available Test Methods: ASTM 1747
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