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 |
| Item | Portable Refractometer J27 | J57WR Bench Automatic Refractometer for Chemical QA |
| Catalog Number | Refractometer J27 | Inquire |
| Price | | |
| Description | The Rudolph Research J27 Handheld Refractometer is a fully portable instrument that combines laboratory-level accuracy with the flexibility needed for on-site measurements. It features precise temperature control, a high-durability sapphire prism, and a user-friendly 7-inch touchscreen interface, The Rudolph Research J27 Handheld Refractometer is a fully portable instrument that combines laboratory-level accuracy with the flexibility needed for on-site measurements. It features precise temperature control, a high-durability sapphire prism, and a user-friendly 7-inch touchscreen interface, making it suitable for various applications in the field.... 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 | 1.3 to 1.7 | 1.30 - 1.70 RI |
| Brix Range | 0 to 100 | 0 - 100 BRIX |
| Resolution | RI 0.0001 – Brix 0.01 | ±0.0001 RI (or ±0.01 BRIX) |
| Temperature Range | 10°C to 35°C | 10°C to 65°C |
| Optical Wavelength | Inquire | 589.3 nm |
| Measuring Time | User Configurable – can be less than 5 seconds | < 5 seconds (User configuarble) |
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