Digital refractometers measure the refractive index of a gel, liquid or solid sample to in order to determine the sample’s concentration. Since more concentrated samples bend light at a larger angle, digital refractometers operate by illuminating the sample against a prism and digitally measuring the angle of refracted light with photodiode detectors. Digital refractometers are used to measure a variety of substances, from the concentration of sugar in grape juice to the purity of solvents, and are widely employed in production and quality control applications in the food, chemicals and pharmaceutical industries. Digital refractometers may be designed for manual, semi-automatic or fully automatic sample reading. Compared to an analog instrument, a digital refractometer offers quick and extensive selection between measurement units and easily exports results. The upper and lower reading limits vary significantly between digital refractometer models. Temperature-controlled digital refractometers, for ranges up to 10 to 120°C, provide better accuracy by compensating for the changes in a sample’s refractive index caused by heat or cold. Handheld digital refractometers offer convenience but may be less accurate and require larger sample sizes compared to desktop instruments. Some digital refractometer models are designed for specific applications with more limited capabilities but optimized performance.
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| Company | Rudolph Research Analytical | Rudolph Research Analytical | Rudolph Research Analytical | Rudolph Research Analytical | Rudolph Research Analytical |
| Item | J157 PLUS Bench Automatic Refractometer | Contact Lens Refractometer J457CLR | J457 Automatic Refractometer | J47 and J47 WR Refractometers | J57WR Bench Automatic Refractometer for Chemical QA |
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| Catalog Number | Inquire | Refractometer J457CLR | J457-SC / J457-FC / J457-WC | Inquire | Inquire |
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| 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's Contact Lens Refractometers are designed for measurement of contact lenses both hard and soft as well as accurately checking saline solutions. | All J457's come with Smart Measure™ Technology that automatically detects when the prism is improperly cleaned, insufficient sample is loaded, or if the instrument is improperly calibrated.
Exclusive Dual Temperature Control System
All J457 models come with Rudolph's exclusive Dual All J457's come with Smart Measure™ Technology that automatically detects when the prism is improperly cleaned, insufficient sample is loaded, or if the instrument is improperly calibrated.
Exclusive Dual Temperature Control System
All J457 models come with Rudolph's exclusive Dual Temperature Control System utilizing Peltier Technology. The J457 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
Features - Dirty prism detection
- Incorrect calibration detection
- Insufficient sample load detection
- Cross contamination detection
- Improper water zero detection
- Trapped air bubble on prism surface detection
... 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 J57WR Automatic Refractometer was designed to meet the unique needs of industrial environments in the chemical industry 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 measurementThe J57WR Automatic Refractometer was designed to meet the unique needs of industrial environments in the chemical industry 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 J57WR features a fully automatic measuring system. The operator simply places the sample on the prism, presses a button and the result is displayed on a 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: Refractive Index (BRIX) readings are very sensitive to temperature. When measuring sucrose users have the option of correcting for temperature variation but that option does not work for most chemical companies. Users not measuring sucrose or users looking for better accuracy than provided by temperature correction had to spend the extra money for a circulating water bath and then clean and maintain it. The J57WR’s built in electronic temperature control provides the best of both worlds, the absolute accuracy, regardless of sample type, of a temperature controlled instrument with the convenience of operating without a water bath.
Wide Measuring Range: The J57WR was designed for chemical measurement, not food. This means a very wide measurement range from 1.26 - 1.70 enabling the instrument to measure materials like fluorocarbons and aromatic chemicals that are beyond the range of most refractometers.... Read More |
| Refractive Index Range | 1.33 - 1.53 RI | 1.26 to 1.72 RI | 1.26 to 1.72 RI | 1.32 to 1.53 RI or 1.30 to 1.7 RI (model dependent) | 1.30 - 1.70 RI |
| Brix Range | 0 - 100 BRIX | 0 to 100 BRIX | 0 to 100 BRIX | 0 to 100 BRIX | 0 - 100 BRIX |
| Resolution | ±0.00001 RI (or ±0.01 BRIX) | ±0.00001 RI (or 0.001 BRIX) | ±0.00001 RI (or 0.001 BRIX) | ±0.00001 RI (or ±0.01 BRIX) or ±0.0001 RI (or ±0.1 BRIX) (model dependent) | ±0.0001 RI (or ±0.01 BRIX) |
| Temperature Range | 4°C to 95°C | 10°C to 110°C | 10°C to 110°C | 4°C to 95°C | 10°C to 65°C |
| Optical Wavelength | 589.3 nm | 589.3 nm | 589.3 nm | 589.3 nm | 589.3 nm |
| Measuring Time | < 3 seconds (User configuarble) | < 30 seconds (User configurable) | < 30 seconds (User configurable) | < 5 seconds | < 5 seconds (User configuarble) |
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