J57 HA Refractometer


This is a system just like J57WR but without the top cover. Model J57WR has a range between 1.30 to 1.70 RI and 0 - 100Brix. The accuracy is +/- 0.0001RI / +/-0.1Brix. The resolution is 0.0001RI and 0.01Brix. The temperature control of the sample can be done in 10 - 65 deg C. This would satisfy both USP and EP needs. The communication interface is through 2 RS232, one parallel printer port and one auxiliary port.

The same system can also be configured for the reading of Butyro scale. The Butyro has to be analysed in 40 deg C and the J57WR can be set for 20 deg C & 40 deg C. This would allow this system to be used in any food company where the analysis would either be for Sucrose or for Butyro.


The J57HA was designed to meet the unique needs of food quality testing where the refractometer is viewed as a QC tool rather than a laboratory instrument. A single flat measurement surface, electronic temperature control and one button measurement capability make it perfect for heavy use applications.

Automatic Measuring System

The Rudolph J57HA features a fully automatic measuring system. The operator simply places the sample on the prism, presses a button and the result is displayed on 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.

Electronic Temperature Control

Brix readings are very sensitive to temperature changes. However these changes in BRIX readings can be minimized by using the ICUMSA temperature correction for sucrose, but only minimized, not eliminated. The ICUMSA Temperature Correction Table was developed for a sucrose and water solution and the further from pure sucrose and water the sample is, the more inaccurate Temperature Correction becomes. Temperature Correction also requires that the sample temperature remain stable during the measurement. So a room temperature sugar solution measurement works reasonably well, but if a sauce sample comes from a kettle or a refrigerator, temperature correction will be almost useless. The solution to measuring hot samples has always been to control the sample temperature with a circulating water bath and then clean and maintain the water bath. The J57HA’s built in electronic temperature control provides the best solution for these real world problems: absolute accuracy regardless of sample type and excellent thermo stability no matter what the sample or environmental temperatures are.

j series cleaning

High Accuracy

 The J57HA was designed for the food industry with a BRIX range of 0 - 95% and a Refractive Index range of 1.33 - 1.53 RI. The J57HA has a ±0.03 BRIX and ±0.00004 Refractive Index accuracy, which matches the accuracy of Rudolph’s best 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 J57HA addresses this issue by providing a very flat easy to clean measurement surface with no corners or crevices that tend to trap samples.

High Durability Sapphire Prism

When a traditional 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.

Lower Cost of Use

Traditional industry has used an Abbe refractometer either with or without a water bath. The cost of replacing the water bath and the Abbe dual glass prism over time makes the cost of owning a J57HA with its single sapphire prism and electronic temperature control, actually less than the cost of an Abbe over their comparable useful lives.


The J57HA 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

j57ha measurements

Versatile 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 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.

j57 03

Touchscreen and LCD

All functions of the J57HA Automatic Refractometer are activated through a large touch screen LCD. The 70mm X 75mm measure button on the J57HA 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 J57HA can be set up as a one-button instrument for factory environments.

Printer & Computer Output

In today's highly regulated environment many users find hard copy or computer record keeping essential. The J57HA comes complete with a standard centronics port for a printer and an RS232 port for direct computer connection.



J57HA Refractometer Specifications

Measurement Scales Refractive Index (RI)
BRIX (% sucrose)
Measurement Range 1.33 - 1.53 RI,
0 - 95 BRIX
Resolution 0.00001 RI
0.01 BRIX
Reproducibility ±0.00002 RI,
±0.02 BRIX
Accuracy ±0.00002 RI,
±0.02 BRIX
Optical 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
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.
Shipping Dimensions L: 26"  W: 21" H: 16" / 30 lbs.
Power Requirements 100-240 volts, 50 Hz - 60 Hz
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