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J157 AUTOMATIC REFRACTOMETER (Refraktometer)
Rudolph Research Analytical, working together with refractometer users from various countries and disciplines, has developed the J157 Automatic Digital Refractometer. The Rudolph J157 combines features and accuracy that meet the most demanding applications both in and out of the laboratory.
Application
The J157 is designed as a high accuracy refractometer for food and water based chemical applications. The instrument can read to ±0.00004 RI / ±0.03 BRIX making it more accurate and reproducible than 4 decimal place wide range chemical refractometers.
Operation
Operating the J157 is as simple as placing a sample on the prism, closing the cover and readings are displayed on the digital, touch screen -- all in just a few seconds. There are no shadow lines to match and there is no eyepiece requiring any type of operator determination or manual adjustment. When the "measure when stable mode" is selected, the J157 automatically waits until the sample has been heated or cooled to a predefined temperature before intiating a measurement.
Dual Temperature Control System
Unlike other temperature controlled refractometers, the J157 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. Depending on options, the sample cover can also be used to initiate an automatic measurement.
Optional Sample Presser
The J157 digital refractometer 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 greatly reducing evaporation and at the same time helping to evenly spread many types of materials including semi solids, and pastes over the measurement prism. This feature offers improved measurement performance on many samples.
Auto Measure Option
The Rudolph Auto Measure Option allows the closing and opening of the presser to start and end a measurement. The operator just closes the cover to start measuring and lifts the cover to stop measuring. The closing and lifting of the lid functions as the start/stop in the measurement process without ever touching the measure button.
Easy to Clean Measurement Surface
No matter how great the refractometer is, accurate results will only be obtained if the prism is clean. The Rudolph J Series offers a flat, easy to clean prism that makes the cleaning process between measurements simple, even with sticky samples.
User Defined Scales
The J157 can be supplied with a large range of standard and customized scales. Scales can be customized in a few minutes. Simply enter 2, 6 or 10 points of concentration vs. corresponding RI data, and the instrument calculates the custom scale automatically.
Calibration
The J157 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.
User Configurable
Versatile laboratory instruments have the advantage of being able to display significant amounts of information, however this versatility can also lead to confusion, with extra buttons and by forcing operators to interpret extra results that have no relevance to their application. 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.
High Durability Sapphire Prism
The J series refractometers offer a sapphire prism for high mechanical and chemical durability. The sample well is made of 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.
Digital LCD Touchscreen
The J157 Refractometer’s large 7.5cm x 10cm cold cathode fluorescent back lit digital LCD screen allows the scale, sample temperature, set temperature, air temperature, time, date and temperature correction status to be easily viewed. All functions are activated through the digital, touchscreen panel which will not wear out or be misplaced like traditional or detachable keypads. The rugged touchscreen is impervious to sharp fingernails, sharp objects, chemicals, and acids.
Simple Yet Flexible
Operating the J157 can be as simple as placing a sample on the prism, closing the presser and reading the answer - all in just a few seconds. The entire 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, like calibration and other functions are all password protected.
Options and Accessories
Calibration liquids from 1.33 - 1.70 (available with 4 decimal & 5 decimal accuracy).
Continuous Flow and Pour-ln Style Pressers allow samples to be continuously monitored or poured directly from a beaker. The J157 standard presser is easily removable with a captured hinge pin and replaced with a Pour-In presser as shown at right or a Continuous Flow presser with an inlet and outlet port. In all cases, volume required for measurement is less than 5ml. Please contact the factory or use our Information Request Form for more details.
Rudolph Research Analytical manufactures automatic, digital, bench-top refractometers for a wide variety of industries. With over 5,000 laboratory instruments installed in demanding applications worldwide and thousands still in use that were manufactured in the 70s, 80s, and 90s, Rudolph has established itself as a premier vendor well known for its quality and reliability. Rudolph has also consistently set the pace for innovative design and features that bring new and important functionality to its market leading line of refractometers. Our service and responsiveness come from a deep commitment to serving our customers with integrity, quality and innovation that we have maintained for over 50 years. Please read one of our customer testimonials.