Automatic Refractometer, J357 Offers Highest Performance for Research Labs.

Designed as a research quality instrument the Rudolph J357 Automatic Digital Refractometer offers one of the highest measurement ranges of any instrument in the Rudolph refractometer product line. This instrument offers the same extra wide RI measurement range as our chemical industry refractometer models combined with the high accuracy of our food industry refractometer models. It also offers very powerful automatic electronic temperature control (heating and cooling) and is able to make RI and BRIX measurements at up to 100 °C.  The J357 is a perfect choice for the most demanding pharmaceutical, chemical, petroleum, essential oils, fragrance and cosmetic refractometer users.

Rudolph Research J 357 Automatic Refractometer Video


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Simple Refractometer Operation

Operating the J357 Automatic refractometer is as simple as placing a sample on the artificial sapphire prism, closing the presser and reading the answer on the Digital Display — all in just a few seconds. There are no shadow lines to match and there is no eyepiece requiring any kind of operator determination or manual adjustment as is often necessary with ABBE Refractometers. When the “measure when stable mode” is selected, the J357 Refractometer automatically waits until the sample has been heated or cooled to a predefined temperature before initiating a measurement.

Interface Solutions

Rudolph allows the lab manager to select from different interface options because we understand laboratories and manufacturing floors have different needs when it comes to the information required for monitoring a process. Your instrument’s interface can be customized to meet the information your application and environment demand whether you choose our full featured interface or our Load-and-Go interface. The J357 offers laboratory flexibility with industrial strength and simplicity making this model series at home on the laboratory bench or on the factory floor.

Full Display with Smart Measure

Refractometer Display

Load – and – Go Display

Refractometer Load and Go Screen

Trend Analysis Display

Refractometer Trend Analysis Screen

Trend Analysis – On-Board Data Collection and Specification Range Monitoring

In a modern factory the most precious commodity is time. When a process starts to move outside its limits people want to know FAST. They want to correct the problem, preferably while it’s still small and before a product goes out of specification.

The Rudolph live reading and trend analysis feature allows users to easily and quickly see how a process is going and catch minor deviations before they become major ones.
Even in the most tightly controlled manufacturing environments things do occasionally go out of specification. When out of specification conditions happen, material has to be quickly identified and decisions made as to what to do with the product. Long term data collection is a part of any good process. Knowing when and where the out of specification condition happened is equally as important. Rudolph Trend Analysis™ software quickly shows a supervisor the process history and where the problem occurred.

Dual Electronic Temperature Control to 100 °C

Unlike other temperature controlled refractometers, the J357 has temperature control from both above and below the sample. The sample cover is controlled to the same temperature as the prism and, when lowered, is designed to provide a temperature controlled micro environment that provides unrivaled temperature stability, fast measurement time and minimal evaporation. With the Auto Measure option, the sample cover can also be used to initiate measurement.

Optional Sample Presser

The Rudolph J357 is available with an optional Temperature Controlled Sample Presser that touches the sample. Compared with the standard temperature controlled cover, the optional presser reduces the empty volume of the measurement area thereby decreasing evaporation and at the same time helping to evenly spread semi solid materials over the measurement prism. This feature offers improved performance on many samples.

Refractometer Calibration

The J357 offers 1 point, 2 point or a full multi-point calibration. Calibration can be done at 20°C, 25°C or any user selectable temperature within the available range. Regardless of how many times the refractometer has been calibrated, it can always be restored to the initial factory calibration if required.

On-Board Custom Scales

The J357 Refractometer is available with 100 possible programmable scales. Custom scales can be set up in a few minutes. Simply enter 2, 6 or 10 data points of concentration and corresponding RI (refractive index) value, press Compute and the instrument creates a new custom scale.

High Durability Sapphire Prism

All Rudolph J series refractometers offer a sapphire prism for high mechanical and chemical durability. The sample well is acid resistant 316 stainless steel with a Techtron sealing ring. There is no lamp to change, the LED light source is guaranteed for 1,000,000 measurements.

An Automatic Refractometer that is Easy to Clean

No matter how good an automatic refractometer is, accurate results will only be obtained if the instrument is clean. The Rudolph J Series refractometers offer a flat, easy to clean prism that makes this process simple even with sticky samples like sugars, syrups, and petrochemicals.

User Interface

A large 7.5cm x 10cm cold cathode florescent back lit graphics, digital LCD allows the scale, sample temperature, set temperature, air temperature, time, date and temperature correction status to be easily viewed. All functions are activated through a touchscreen panel which will not wear out or be misplaced like traditional or detachable keypads. The digital touchscreen is resistant to fingernails, sharp objects, chemicals, and acids.

No Water Bath Needed

Having Rudolph’s J357 fully automatic electronic temperature control means:

  • A significant savings on bench space because the water bath is eliminated.
  • Integrated temperature control where the instrument knows when to measure and records both the Refractive Index measurement and the temperature.
  • Hot liquid from a bath can present a significant danger in the laboratory in the event of a split hose, the J357 doesn’t use liquid and thereby eliminates this risk.
  • Eliminating the water bath removes the most maintenance intensive part of a Refractometer. Water baths need to be regularly filled, dosed with algaecide and cleaned.

Traceability & 21 CFR Part 11 Compliance

  • All measurements are made automatically, which eliminates the need for operator judgment.
  • Calibration with fluids traceable to NIST and calibration data securely stored and available for review.
  • Temperature can be calibrated against a traceable thermometer.
  • Operator Traceability, full 21 CFR Part 11 compliant password system.
  • Verification step with electronic signature.

Networking, Data Recording, and Data Management

The J357 offers several options for data storage. Data may be stored internally by means of an 8 MB Internal Compact Flash Memory, to a network via RS232, Cat 5 Network port, or via 3 rear and 1 side USB Ports. Storage options include writing and storing to a network, sharing to a LIMS system, and Storage to a removable USB drive.  For all data storage options see: Refractometer Data Storage

Refractometer Rear Panel

A Refractometer Suitable for a Wide Range of High Demand Environments

  • Petroleum and Petrochemical Laboratories where the J357’s ability to measure at up to 100ºC without a water bath makes the instrument ideal for ASTM D1218, D1747 and D5006.
  • Research Laboratories where the wide range and high accuracy of the Rudolph J357 means researchers have the maximum chance of measuring newly synthesized products.
  • Central Research and Reference Laboratories where having the most accurate results available for setting standards for an organization or a country is needed.
  • Chemical Laboratories can measure more viscous products with a level of accuracy previously available only in narrow range food instruments.

Return to view the entire Rudolph Research Product Line

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All Rudolph Instruments carry our exclusive 20 Commitment to service your instrument.

Rudolph Research Analytical offers a comprehensive range of Preventive Maintenance and Service Programs. Rudolph has demonstrated a commitment to its customers by keeping installed instruments operational, not only for 20 years, but in some cases for over 40 years. This long-term commitment to keeping our instruments running makes the cost of ownership, over the life of a Rudolph Instrument, one of the lowest in the laboratory market segment. At the date this document was published, there is no other laboratory instrument manufacturer guaranteeing service and technical support for 20 years. View the entire 20 Service Guarantee. 

Automatic Refractometer J357 – Specifications

J357 AUTOMATIC Specifications
Measurement Scales

Refractive Index (RI)
BRIX (% sucrose)
100 User Programmable Scales

Measurement Range

RI 1.26 - 1.72 ,
BRIX 0 - 100%,
Urine SG 1.0000-1.0400

Resolution

RI ±0.00001
BRIX ±0.001

Reproducibility

RI ±0.00002,
BRIX ±0.015

Accuracy

RI ±0.00002,
BRIX ±0.015

Optical Wavelength

589.3nm

Prism

Synthetic Sapphire

Light Source

Light Emitting Diode (est. life: >100,000 hrs.)

Response Time

User configurable -- can be less than 2 seconds

Communication Interface

3 USB
RS232 ports
Cat5 Network (Ethernet)

Analog Control

0-10 volts, 4-20 mA

Temp. Control Range

10ºC - 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. Measurement & Control

Prism surface and presser

Calibration

Using water or NIST traceable standards

Operating Dimensions

L: 17.25"  W: 12"  H: 13"  / 23 lbs.

Shipping Dimensions

L: 27"  W: 21"  H: 17" / 30 lbs.

Power Requirements

100-240 volts, 50 Hz - 60 Hz