• J457 Refractometers


The J457 Electronic, Laboratory Refractometer is the most capable instrument in the Rudolph Research Refractometer Product Line. 3 models/configurations are available. All come with Rudolph’s exclusive Smart Measure™ Technology that virtually insures accurate Refractive Index (RI) and BRIX, measurements by automatically detecting sample problems. The J457 can determine when the prism is improperly cleaned, insufficient sample is loaded, or if the instrument is improperly calibrated.

Product Description

The J457 Laboratory Refractometer, Simple to Operate Without Sacrificing Accuracy or Capabilities.

The Rudolph J457 can be configured with a Load and Go Measurement feature for your routine measurements tasks. Initiating a measurement begins by placing a sample on the prism. There are no buttons to press and all measurements are made  based on the per-determined Method. This allows the J457 to maintain it’s high level of accuracy and performance with Load and Go convenience.

Versatile Data Storage Options

The J457 Refractometer offers various data storage options to meet the needs of any lab and any compliance requirement. With 8mb of on-board memory the J457 can work on a stand-alone basis or memory sticks can be utilized to expand memory or make data easily transportable to a PC. The J457 is easily connected to your network or may be linked with a PC. For all data storage options see: Refractometer Data Storage

Sample residue is left on the refractometer prism surface

Experience has shown that incorrect laboratory refractometer measurements are often linked to cross contamination caused by the previous sample being inadvertently mixed with the current sample being measured. Ensuring that the prism surface is properly cleaned between measurements can be difficult for busy environments where multiple operators are involved. Rudolph Research Analytical has solved this problem as well as the related problems an inaccurate measurement can cause.

Smart Measure™ solution:

Automated clean prism monitoring is now integrated in the Rudolph Research J457 Laboratory Refractometer.

Smart Measure™ knows when the Refractometer’s prism is clean. If the prism surface does not produce the correct “Clean Prism” result then Smart Measure™ notifies the Laboratory Refractometer operator that further cleaning of the prism is necessary. Smart Measure™ notifies the operator that it is ready to measure after the prism is satisfactorily cleaned. The refractometer is now ready to make an accurate RI or BRIX reading with a verified clean sample well.

Automated sample load monitoring – reduces refractometer user error.

Smart Measure™ knows when a sample has been loaded on the refractometer‘s prism and immediately begins evaluating various metrics surrounding the sample load. If Smart Measure™ determines that those metrics indicate proper sample loading, it will display the result with a sample quality number. If Smart Measure™ determines that the metrics indicate an improper sample load, Smart Measure™ will ask the operator to clean the prism and re-load the sample.

Automated sample calibration inspection.

Smart Measure™ is constantly measuring the refractometer’s prism surface and monitoring the value measured against its database of results. If during a water zero calibration the instrument detects a value that is too different from the database or the RI value being input is far from the measured value, it will alert the operator

Automated sample calibration inspection.

Smart Measure™ catches these flyers by scanning the detector for varying RI values and then alerts the user to reload the sample. Since the user does not get a value to record until a new sample load is completed, Smart Measure™ greatly reduces the erroneous refractometer measurements from being recorded.

Rudolph’s exclusive Electronic Dual Temperature Control System.

All J457 models come with Rudolph’s exclusive Dual Temperature Control System utilizing Peltier Technology. The J457 Refractometer heats and cools the sample from both prism surface and sample cover. The insulating cover housing seals the Prism Well Ring to create a uniform temperature environment providing unmatched temperature control uniformity resulting in consistently accurate RI measurements.

J457-WC Automatic Refractometer in a Wall Mount Configuration.

J457-WC Refractometer in a compact Wall Mount Configuration is designed for production environments where water is used for cleaning or there is a lot of sample spillage on the work surface. This configuration is also excellent for situations where there is very little work space available: out on the factory floor or in an over crowded satellite laboratory where there is little to no remaining bench space for a standard Bench-top configuration.

J457-FC Automatic Refractometer in Factory Configuration.

J457-FC Refractometer in Factory Configuration is recommended when there is a lot of sample spillage on the laboratory’s instrumentation. Factories working with sticky resins and syrups that end up being spilled on the instrumentation are great candidates for the J457-FC as the measurement unit can be as much as six feet away from the display unit.


Laboratory Refractometer J457 – Specifications

J457 Automatic Refractometer Specifications (all models)
Measurement Scales Refractive Index (nD)
BRIX (% sucrose)
and up to 100 custom programmed scales.
Measurement Range Refractive Index 1.26 – 1.72,
BRIX 0 – 100%
Urine SG 1.0000-1.0400
Accuracy Refractive Index ±0.00002,
BRIX ±0.015
Reproducibility Refractive Index ±0.00002,
BRIX ±0.015
Resolution Refractive Index ±0.00001
BRIX ±0.001
Temp. Control Range 10°C to 110°C
*other temperature control options are available
Temp. Control Reproducibility ±0.01°C
Ambient Temp. Limit 5°C to 40°C
Temp. Correction Range 4°C to 95°C (for sucrose solutions)
Sample Temp. Limit -20°C to 250°C
Optical Wavelength 589.3nm (NaD line)
Response Time User configurable, generally less than 30 seconds
Calibration Using water or NIST traceable fluids. Factory default calibration can always be reset
Prism Artificial Sapphire
Acid Resistance Hastelloy™ measurement surface (optional)
Data Storage/Internal Memory 8GB non-removable Compact Flash
Display 10.4 inch diagonal, 800×600 pixels, color, Flat Panel Monitor with Resistant Touch Screen Interface, 400 nits brightness, gasketted for spill protection.
User Interface Touchscreen
Communication Interface 3 USB, RS232 and Cat5 Network (Ethernet)
Operating Dimensions/Weight L: 17 ¼”, W: 12”, H: 13” / 23 lbs.
L: 43.5 cm, 30.5 cm, 33 cm / 10.4 kg
Power Requirements 100 – 240 volts, 50 Hz – 60 Hz



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