| Description | The Rudolph J157 model of Refractometers offers high performance and a range of features to suit many demanding applications in laboratories and harsh industrial environments. Rudolph Research Analytical, working together with refractometer (Refraktometer) users from various countries and The Rudolph J157 model of Refractometers offers high performance and a range of features to suit many demanding applications in laboratories and harsh industrial environments. Rudolph Research Analytical, working together with refractometer (Refraktometer) users from various countries and disciplines, has developed the J157 series of Digital Refractometers. The Rudolph J157 bench-top line combines the features, measurement range, and accuracy that meet the most demanding applications both in and out of the laboratory and shares many features with the Rudolph Research Refractometer Product Line.... Read More | Rudolph Research Analytical, working together with refractometer users from the polymer, petroleum, pharmaceutical and essential oil industries, has developed the J257 Wide Range Automatic Refractometer. The J257 Refractometer features include electronic cooling and heating with an extended Rudolph Research Analytical, working together with refractometer users from the polymer, petroleum, pharmaceutical and essential oil industries, has developed the J257 Wide Range Automatic Refractometer. The J257 Refractometer features include electronic cooling and heating with an extended refractive index range.
Application: The J257 is designed as a multi purpose refractometer for a broad range of refractive index applications. The wide refractive index range of 1.26-1.70 means that this instrument can measure many materials that a refractometer with a food refractive index range of 1.33-1.53 cannot.
Operation: Operating the J257 is as simple as placing a sample on the prism, closing the cover and reading the answer — 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. When the "measure when stable" mode is selected, the J257 automatically waits until the sample has been heated or cooled to a predefined temperature before initiating a measurement.
Interface: A large 7.5cm x 10cm cold cathode fluroescent back lit graphics 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 that will not wear out or get misplaced like traditional or detachable keyboards. The touchscreen is resistant to fingernails, sharp objects, chemicals, and acids.
Dual Temperature Control System: Unlike other temperature controlled refractometers, the J257 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 measurement. This means that the operator doesn't even need to touch the refractometer screen on a day to day basis, simple lower the cover and measurement starts automatically.... Read More | Designed as a research quality instrument the J357 has the highest performance of any refractometer in the Rudolph range. This instrument offers the same extra wide range as our chemical industry models combined with the high accuracy of our food industry models. It also offeres the most powerful Designed as a research quality instrument the J357 has the highest performance of any refractometer in the Rudolph range. This instrument offers the same extra wide range as our chemical industry models combined with the high accuracy of our food industry models. It also offeres the most powerful temperature control and is able tot measure at up to 120 °C
Operation: Operating the J357 is as simple as placing a sample on the artificial sapphire prism, closing the presser and reading the answer -- 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. When the "measure when stable mode" is selected, the J357 automatically waits until the sample has been heated or cooled to a predefined temperature before initiating a measurement.
Dual Electronic Temperature Control to 120C: Unlike other temperature controlled refractometers, the J357 has temperature D6control 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 unr+D18ivaled temperature stability, fast measurement time and minimal evaporation. With he Auto Measure option, the sample cover can also be used to initiate measurement.... Read More | The Rudolph J47 and J47 WR refractometer features a fully automatic measuring system designed to meet the unique needs of a food and beverage testing where the samples are mostly a mixture of sugar and water and the refractometer is viewed more as a tool than a laboratory instrument. The J47’s The Rudolph J47 and J47 WR refractometer features a fully automatic measuring system designed to meet the unique needs of a food and beverage testing where the samples are mostly a mixture of sugar and water and the refractometer is viewed more as a tool than a laboratory instrument. The J47’s single flat measurement surface, temperature correction and one button measurement capability make it perfect for heavy use applications.
Features: - Temperature Correction (ICUMSA or custom)
- High accuracy in appropriate circumstances
- High durability sapphire prism
- Lower cost of use
- 1 or 2 point user calibration
- Easy to clean measurement surface
... Read More | 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 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.
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.... Read More |