- Technical Information
- Information Requests
- Definitions
- General Information
- About Us
- Contact Us
- Trade Shows
- Customers/ Industries
- Information
- Specifications
J257 AUTOMATIC REFRACTOMETER
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.
Electronic Temperature Control
The J257 Automatic Refractometer eliminates the expense and contamination associated with using circulating waterbaths to control and maintain the sample temperature. The J257 utilizes state of the art Peltier technology with built-in cooling Refractive Index vs. Temperature and heating in both the presser head and surrounding the prism. The J257's two cooling and heating systems, along with a thermally isolated platinum RTD sample temperature sensor, give the J257 accuracy and measurement advantages over other commercially available refractometers which only use the prism to measure and control temperature. The J257 can control any temperature between 10†C and 40†C to better than 0.05†C. Just set the temperature to 20†C, 25†C, 27.5†C or any temperature within 20†C of ambient and the refractometer will automatically cool or heat the sample to the set temperature. The time necessary to reach the set temperature depends upon the original sample temperature and the ambient air temperature. In most situations, set temperature can be obtained in a matter of seconds. As an example, a set temperature of 20†C will cool a 30†C sample to 20†C in twenty seconds. Temperature correction can be used in conjunction with temperature control for a virtually instantaneous measurement.
Touchscreen and LCD
The J257 Refractometer's large 7.5cm x 10cm cold cathode fluorescent 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 which will not wear out or get misplaced like traditional or detachable keypads. The touchscreen is impervious to sharp fingernails, sharp objects, chemicals, and acids.
Simple Yet Flexible
Operating the J257 can be as simple as placing a sample on the prism, closing the presser and reading the answer - all in just a few seconds. The entire 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, like calibration and other functions are all password protected.
Calibration
The J257 Refractometer offers 1 pt, 2 pt, or a full multi-point calibration can be selected. Regardless of how many times the refractometer has been calibrated, it can always be restored to the initial factory calibration if required.
Options and Accessories
Calibration liquids from 1.33 - 1.70 (available with 4 decimal & 5 decimal accuracy).
Continuous Flow and Pour-ln Style Pressers allow samples to be continuously monitored or poured directly from a beaker. The J257 standard presser is easily removable with a captured hinge pin and replaced with a Pour-In presser as shown at right or a Continuous Flow presser with an inlet and outlet port. In all cases, volume required for measurement is less than 5ml. Please contact the factory or use our Information Request Form for more details.