Extended Range Refractometer
The Rudolph Research Analytical J257 has an extended refractive index range
Refractometer with extended Refractive Index range
Versatile and automated
Dual temperature control
Highly versatile refractometer
Refractometer with Extended Range
A highly versatile refractometer, the Rudolph Research J257 has an extended Refractive Index (RI) measurement range and was developed by working together with laboratory refractometer users from the polymer, petroleum, petrochemical, pharmaceutical and essential oil industries. The J257 is a fully automatic digital instrument featuring electronic cooling and heating.
Versatile Refractometer for a Wide Range of Applications
The J257 is designed as a multipurpose versatile refractometer for a broad range of refractive index measurement applications. Many laboratories need the versatility of a wide range refractometer as they measure many varied samples. The J257 measures the widest possible range of Refractive Index from 1.26 to 1.72 RI. This means that this instrument can measure many materials that a refractometer with only a food refractive index range of 1.33-1.53 cannot.
Automatic Refractometer Operation
Operating the J257 is as simple as placing a sample on the prism, closing the cover and reading the results on the digital screen. Being fully automated 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.
Try Before You Buy
The J257 is available for a short term trial.
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J257 Refractometer
Refractometer Selection Guide
Easy To Read LCD Interface
A large 7.5cm x 10cm cold cathode fluorescent back lit, 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 touch screen panel that will not wear out or get misplaced like traditional or detachable keyboards. The durable touch screen is resistant to fingernails, sharp objects, chemicals, and acids.
Data Storage Options
The J257 refractometer offers various data storage options to meet the needs of any lab and any compliance requirement. With 32mb of on-board memory it can work on a stand-alone basis or memory sticks can be utilised to expand memory or make data easily transportable to a PC. The J257 is easily connected to your network or may be linked with a PC.
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 never even needs to touch the refractometer screen on a day-to-day basis, simply lower the cover and measurement starts automatically.
Optional Sample Presser
An optional temperature controlled sample presser that touches the sample is available. This makes the J257 one of the most versatile refractometers for a very wide range of uses. 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 refractometer’s measurement prism. This feature offers improved refractive index (RI) readings on a wide range of often hard to measure samples.
Sample Cover Options
EP Refractometer Sample Cover
The EP sample cover is excellent for applications where the measurement temperature is near ambient. The cover is a single unpowered piece and temperature control is provided only from below the sample.
CC Refractometer Sample Cover
The (CC) concave sample cover is controlled to the same temperature as the prism. When lowered it provides the upper part of a temperature-controlled microenvironment that totally surrounds the sample.
CP Refractometer Sample Cover
The (CP) contact presser spreads the sample evenly over the measurement area. Therefore, it is ideal for highly viscous samples like heavy syrups and resins that need a thin layer for the best measurement results.
Calibration
The versatile J257 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 refractometers in the lab have the advantage of being able to display a lot of information, however this versatility can also lead to confusion, with extra buttons and by forcing the operator to interpret extra information that may have no relevance to their application. The customizable digital refractometer 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, 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.
Standard prism and sample dish
Ultra-flat prism and sample dish
Durable and Rugged
The Rudolph J Series refractometers are rugged laboratory instruments offering 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.
Refractometer Options and Accessories
- NIST traceable calibration liquids
- IQ/OQ/PQ package
- Acid resistant sample well and plate
- Printer
- Pre-programmed custom scale
- Data capture software
- Small volume, easy to clean sample well
- Different measurement wavelengths
- Barcode reader
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Specification
Measurement Scales: Refractive Index (RI) BRIX (% sucrose) Temperature Corrected BRIX Temperature Corrected RI 100 User Programmable Scales
Measurement Range: 1.26 – 1.72 RI, 0 – 100 BRIX
Resolution: Refractive index 0.0001(Standard), 0.00001 (Optional) BRIX 0.1(Standard), 0.01 (Optional)
Repeatability: ±0.0001 RI, ±0.1 BRIX
Accuracy: ±0.0001 RI, ±0.05 BRIX
Optical Wavelength: 589.3nm (other wavelengths available)
Prism: Industrial Sapphire
Light Source: Light Emitting Diode (est. life: >100,000 hrs.)
Response Time: Continuous readout or user programmable delay (i.e. a 25ºC sample can be cooled to 20ºC and measured in 20 seconds)
Communication Interface: 3 USB RS232 ports Cat5 Network (Ethernet)
Analogue Control: 0-10 volts, 4-20 mA
Temperature Control Range (Within 10C of Ambient): 10ºC – 100ºC *other temperature control options are available – 5ºC – 110ºC available with temperature boost option.
Temperature Sensor Accuracy: ±0.05ºC
Ambient Temperature Limit: 5ºC – 40ºC
Temperature Correction Range: 4ºC – 95ºC (for pure sucrose solutions)
Temperature Control: Prism surface and presser
Calibration: 1, 2 or full multi-point calibration
Power Requirements: 100-240 volts, 50 Hz – 60 Hz
Dimensions: L: 38.75cm W: 25.5 cm H: 11.5 cm
Weight: 10.5 kg