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 | J57HA Automatic Refractometer for Food Quality Testing | VeriLinkRx® Hospital Refractometer |
| Reviews | | |
| Catalog Number | Inquire | VeriLinkRx |
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| Description | 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 | The VeriLinkRx® can be used for possible drug diversion testing for dilutions or substitutions in Morphine, Hydromorphone, Oxycodone, Fentanyl, and other narcotics. An analytical method, like Rudolph’s VeriLinkRx® , is a reliable and cost effective solution to verify that the actual narcotic is The VeriLinkRx® can be used for possible drug diversion testing for dilutions or substitutions in Morphine, Hydromorphone, Oxycodone, Fentanyl, and other narcotics. An analytical method, like Rudolph’s VeriLinkRx® , is a reliable and cost effective solution to verify that the actual narcotic is returned to the hospital pharmacy.... Read More |
| Refractive Index Range | 1.33 - 1.53 RI | 1.32 to 1.45 |
| Brix Range | 0 - 100 BRIX | 0 to 100 |
| Resolution | ±0.00001 RI (or ±0.01 BRIX) | Refractive Index 0.000001, Brix 0.01 |
| Temperature Range | 10°C to 65°C | 5°C to 40°C |
| Optical Wavelength | 589.3 nm | 589.3nm (NaD line) |
| Measuring Time | < 5 seconds (User configuarble) | 10 seconds |
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