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J57 WR

Refractometer For Chemical Labs Requiring Extended Measuring Range

Product Category: Refractometers

Industry: Food, Dairy and Wine, General Laboratory, Pharmaceutical, Personal Care and Natural Products

Supplier: Rudolph Research Analytical


Automatic Refractometer  J57WR – Wide Measurement Range for the Chemical Industry.

The J57WR is part of the Rudolph Research line of Laboratory Refractometers. The Rudolph J57WR Automatic Digital Refractometer (Refraktometer) was designed to meet the unique needs of industrial environments in the chemical industry where the refractometer is viewed as a Quality Control (QC) tool rather than a laboratory instrument. A single flat measurement surface, automatic electronic temperature control and one button measurement capability make it perfect for heavy use applications where fast, automatic, and accurate readings are required.

Automatic One-Touch Measuring System

The Rudolph J57WR features a fully automatic measuring system. The operator simply places the sample on the prism, presses a button and the digital results are displayed on a 7.5cm x 10cm back lit digital, LCD screen. There are no shadow lines to match and there is no eyepiece requiring operator determination or manual adjustment.

Automatic Electronic Temperature Control

Refractive Index (BRIX) readings are very sensitive to temperature. When measuring sucrose users have the option of correcting for temperature variation but that option does not work for most chemical companies. Users not measuring sucrose or users looking for better accuracy than provided by temperature correction had to spend the extra money for a circulating water bath and then clean and maintain it. The J57WR’s built in electronic temperature control system provides the best of both worlds, the absolute accuracy, regardless of sample type, of a temperature controlled instrument with the convenience of operating without a water bath.

Refractometer with a Wide Measuring Range

The J57WR was designed for chemical measurement, not food. This means a very wide measurement Refractive Index (RI) range from 1.26 – 1.70 is available thus enabling the instrument to measure materials like fluorocarbons and aromatic chemicals that are beyond the range of most refractometers.

Easy to Clean Measurement Surface

Regardless of the specified instrument accuracy the real world performance will always depend on how well the instrument is cleaned between samples. The Rudolph Research J57WR addresses this issue by providing a very flat easy to clean measurement surface with no corners or crevices that tend to trap samples in instruments designed for laboratory use.

High Durability Sapphire Prism

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

Lowest Cost Refractometer over the Life of the Instrument.

Users in high throughput chemical applications have traditionally used Abbe refractometers due to their low initial purchase price. Changes in relative prices between refractometers and optics and the elimination of a water bath mean the J57WR now delivers a much lower total cost over the life of the instrument than an Abbe refractometer. The speed and accuracy of readings also increases productivity and reduces costly mistakes that can be potentially caused by inaccurate readings.


The J57WR Automatic Refractometer offers 1 or 2 point calibration. The instrument stores the date and the time of the last calibration in line with ISO and similar standards. Regardless of how many times the refractometer is calibrated it can always be restored to the default factory calibration.

User Configurable

Versatile laboratory instruments have advantages when applications change however this versatility can also lead to confusion with extra buttons and by forcing operators to interpret extra results that have no relevance. The Rudolph J Series customizable display allows the instrument to be configured to exactly what is required for each application. The customizable digital keypad can be “locked out” or just a few keys can be operable, i.e. the measure key, print key, zero key, customer specified sample keys or any combination thereof. The lockout function, calibration and other functions are all password protected.

Touchscreen and Digital LCD

All functions of the J57WR Automatic Refractometer are activated through a large touch screen, digital LCD. The 70mm X 75mm measure button on the J57WR is designed to allow an operator wearing gloves to activate measurement with an elbow or side of a hand. The sealed touch screen is resistant to fingernails, sharp objects, chemicals and acids.

Password Protection

A combination of password protection and being able to lock out specific “keys” enables control over which users can access certain functions. This means that the J57WR can be set up as a one-button instrument for high production factory environments.

Printer & Computer Output

In today’s highly regulated environment many users find hard copy or computer record keeping essential. The J57WR comes complete with a standard centronics port for a printer and an RS232 port for direct computer connection to facilitate a permanent information trail.


J57WR Refractometer Specifications
Measurement Scales Refractive Index (RI)
BRIX (% sucrose)
Measurement Range 1.26 – 1.70 RI,
0 – 100 BRIX
Resolution 0.00001 RI
0.01 BRIX
Reproducibility ±0.0001 RI,
±0.1 BRIX
Accuracy ±0.0001 RI,
±0.1 BRIX
Wavelength 589.3nm
Prism Artificial Sapphire
Light Source Light Emitting Diode (est. life: > 1,000,000 measurements)
Response Time Continuous readout or user programmable delay (i.e. a 25°C sample can be cooled to 20°C and measured in 20 seconds)
Communication Interface Two RS232 ports
One parallel printer port
USB adaptor available
Control Temperature 20°C and 25°C
Temp. Accuracy ±0.05°C
Ambient Temp. Limit 10°C – 40°C
Temp. Correction Range 18°C – 95°C (for pure sucrose solutions)
Temp. Measurement & Control Prism surface
Calibration 1, 2 or 10 point
Operating Dimensions L: 16″  W: 14″  H: 6″  / 13.6 lbs.

L: 40cm  W: 35cm  H: 15cm / 7kg

Shipping Dimensions L: 26″  W: 21″  H: 16″ / 30lbs

L: 66cm  W: 54cm  H: 40cm / 14kg

Power Requirements 100 – 240 volts, 50 Hz – 60 Hz

Scientific Solutions

Scientific Solutions have been providing carefully selected laboratory and analytical equipment to Australian Industries such as Environmental, Pharmaceutical, Food and Beverage and Research markets of the Science Industry for over a decade.

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