• j47


Refractometers for the Food & Beverage Industry, J47

  • Very fast measuring food and beverage industry refractometer (Refraktometer)
  • On-board temperature correction using the latest ICUMSA tables.
  • Simple to load, simple to measure, simple to clean
  • Result independent of operator judgment
  • The J47 is part of the Rudolph Research Refractometer Product line

Product Description

The J47 Refractometer comes in 2 models to meet your application needs

  • Where High Accuracy is critical the J47HA Model Refractometer offers Accuracy of ±0.00003 RI and Brix Accuracy of ±0.03 with an RI Measurement range of 1.32-1.53 and Brix measurement range of 0-100
  • Where Measurement Range is most importance the J47WR Model Refractometer offers an RI Measurement range of 1.3-1.7 and Brix measurement range of 0-100 with Accuracy of ±0.0001 RI and Brix Accuracy of ±0.1


The J47 was designed to meet the unique needs of a food and beverage testing where the samples are mostly a mixture of sugar and water and the refractometer is viewed more as a tool than a laboratory instrument. The J47’s single flat measurement surface, temperature correction and one button measurement capability make it perfect for heavy use applications.


The Rudolph J47 features a fully automatic measuring system. The operator simply places the sample on the prism, presses a button and the result is displayed on a 7.5cm x 10cm back lit LCD. There are no shadow lines to match and there is no eyepiece requiring operator determination or manual adjustment.

Easy to read, back lit LCD Touch Screen

All functions of the J47 Automatic Refractometers are activated through a large 4.3″ 480dpi, digital, color TFT LCD touch screen. The 70mm X 75mm measure button on the J47 is designed to allow an operator wearing gloves to activate measurement with an elbow or side of a hand. The sealed touchscreen is resistant to fingernails, sharp objects, chemicals and acids.


The Rudolph J47 refractometer corrects for errors caused by sample temperature variation using the latest ICUMSA temperature correction tables. Temperature correction is a very fast mathematical solution to obtaining measurement results without a temperature control system or a water bath. These measurement results are the most accurate when samples are comprised of predominantly sugar and water.


The J47HA was designed for the food and beverage industries with a BRIX range of 0 – 100% and a Refractive Index range of 1.32-1.53.  The J47HA offers an accuracy of ±0.03 BRIX and ±0.00003 Refractive Index.


The J47 is the temperature corrected but not temperature controlled model of the Rudolph range. It offers most of the same features as our more expensive models but lacks the built in Peltier heating and cooling system for samples requiring temperature control. The J47 is a true simplified laboratory instrument rather than a digital hand refractometer pushed beyond limits.


Regardless of an instrument’s specified accuracy, a refractometer’s real world performance depends on how well the instrument is cleaned between samples. The J47 addresses this issue by providing a very flat easy to clean measurement surface with no corners or crevices that tend to trap samples causing contamination


When a traditional manual Abbe refractometer is used in a high throughput application prism replacement becomes a regular task. This is because traditional Abbe refractometers have glass prisms which are much softer than the sapphire prism of the J Series and thus more prone to scratching and general wear and tear as described below.


The traditional method of measuring Brix in a laboratory was a Abbe refractometer, sometimes with a water bath attached, sometimes not. (An Abbe with a water bath is the functional equivalent to the J57. An Abbe without the water bath is the functional equivalent to the J47).

The cost of replacing the Abbe’s dual glass prisms over time makes owning a J47 with its single sapphire prism actually less expensive than owning an Abbe over their comparable useful lives.


The J47 offers a 1 or 2 point user calibration. The instrument stores the calibration information in line with ISO and similar standards. The calibration system is password protected enabling an administrator to control who can calibrate the instrument.


Versatile instruments have advantages when applications change. However, versatility can sometimes lead to confusion by forcing operators to interpret extra results that may have no relevance. The J Series customizable display allows the instrument to be configured to exactly what is required for each application. The customizable keypad can be “locked out” or just a few keys can be operable, making for an even faster learning curve. The lockout function, calibration and other functions are all password protected.

Refractometer J47 – Specifications

J47 Refractometer Specifications
Measurement Scales Refractive Index (RI)
BRIX (% sucrose)
Temperature Corrected BRIX
Temperature Corrected RI
100 User Programmable Scales
Measurement Range J47HA – 1.32 – 1.53 RI, 0 – 100 BRIX
J47WR – 1.3 – 1.7 RI, 0 – 100 BRIX
Accuracy J47HA – ±0.00003 RI, ±0.03 BRIX
J47WR – ±0.0001 RI, ±0.1 BRIX
Reproducibility J47HA – ±0.00002 RI, ±0.01 BRIX
J47WR – ±0.0001 RI, ±0.1 BRIX
Resolution J47HA – ±0.00001 RI, ±0.01 BRIX
J47WR – ±0.0001 RI, ±0.1 BRIX
Prism Synthetic Sapphire
Light Source Light Emitting Diode (est. life: 100,000 hrs.)
Response Time User configurable, can be less than 5 seconds
Communication Interface 1 USB, 1RS232
Temperature Control Temperature Correction Only
Temperature Correction range 4ºC – 95ºC (for pure sucrose solutions)
Calibration Using water or NIST traceable fluids. Factory Default calibration can always be reset.
Operating Dimensions L: 12″ W: 6″ H: 5″ / 7.8 lbs.
L: 31 cm W: 15.5 cm H: 13 cm / 3.5 kg
Shipping Dimensions L: 17″ W: 12″ H: 13″ / 11.8 lbs.
L: 42.5 cm W: 30 cm H: 34 cm / 5.5 kg
Power Requirements 100-240 volts, 50 Hz – 60 Hz



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