Measurement of Concentration Dependence of Refractive Index to Enhance Gel Permeation Chromatography for Polymer Characterization Author: Gabor Kiss Date: October 2019 Background: One of the workhorse techniques for polymer characterization is Gel Permeation Chromatography (GPC) which is used to measure molecular weight, molecular weight distribution, degree of branching, radius of gyration, solvent power, etc. The
Read More »
RI Measurement of Solids and Films. RI measurement of solids and semi-solids is useful in labs for monitoring quality to insure consistency of transparency, pigmentation, or batch quality. RI might be measured on incoming materials or finished products. Highly accurate measurements are possible with the right refractometer and a method to measure the material. Instrument:
Read More »
Refractometer Uses in Industry and Selection By Angelo DePalma, PHD A refractometer characterizes fluids based on their refractive index –the refraction occurs due to the change in the speed of light as it travels through a material of one density to one of different density. By definition a vacuum has a refractive index of 1,
Read More »
Refractometer Calibration, 2 point method, Rudolph Research J157 – Video Transcript Refractometer Calibration resource – for laboratory refractometer users utilizing a Rudolph Research Automatic Refractometer. Hi, I am John Ciccarella, Service manager of the most innovative line of refractometer instruments made today from Rudolph Research Analytical. John Ciccarella , Rudolph Research, Service Manager with a
Read More »
Refractometer Temperature Correction & Control Peter Marriott – Refractometer Product Manager Rudolph Research Analytical Also see video: Refractometer, Temperature Correction & Control with a Rudolph J457 We are going to look at the effects of changing temperature on refractive index measurement and if Temperature Correction can compensate for temperature variances or if actual temperature control
Read More »
Digital Refractometers – Universal Concentration Meters By Angelo DePalma, Ph.D – Partial Reprint – Originally Published April 6th, 2011, for original see Lab Manager; – Refractometers are instruments that quantify and identify chemicals and materials based on their refractive index (RI). A unique property related to the speed of light as it passes through a substance, RI (Refractive Index)
Read More »
I would definitely recommend your instrumentation to anyone I know because it is excellent instrumentation and awesome technical support always.
Read More »
The refractometer is easy to use and easy to clean. We are looking forward to many years of trouble free operation.
Read More »
The lab technicians like it for its ease of use, and the lab supervisors (myself included) like it for its reproducibility from one technician to the next…
Read More »
I just want to say how pleased we are with our Rudolph J157 Automatic Refractometer. We use it in the Production Lab where it is just as accurate as our standard Abbe type refractometer.
Read More »
Incorporating this system into our laboratory has been like adding another employee. It saves time while ensuring accurate results, and is extremely user-friendly. In addition, I’ve found that Rudolph Research Analytical goes the extra mile to ensure their customer is satisfied with their product and their service. I would highly recommend this equipment and this company to any lab as busy as ours…
Read More »
Based on very satisfying results, we decided this year to replace also the backup Abbe style instrument by a second Rudolph refractometer. We are very pleased with your instruments; you can consider us as reference customer.
Read More »
The J257 refractometer, which we recently purchased from Rudolph, has been a valuable addition to our laboratory. It has provided us with consistent and accurate readings for both research and production.
Read More »
We purchased two J257 Automatic Refractometers …Those instruments not only supply critical data in the creation and optimization of products, but they often do so as many as seven days a week. The ability to make fast, accurate and reliable determinations of refractive index in just a matter of seconds allows us to maximize the quality of our products.
Read More »
I would highly recommend the Rudolph J57HA Refractometer over any other brand of refractometer that I have used or tested throughout my many years working in the sugar industry…
Read More »
…I have been extremely pleased with the Autopol (Polarimeter) instruments over the years…As expected, our refurbished Autopol II has been reliable and easy to use. I should add that your personal visit to help us set up the instrument was very helpful and illustrated to me that Rudolph Research stands behind its products.
Read More »
Overall, the instrument has been trouble-free and easy to use. Combined with the excellent costumer service provided to me by Rudolph Research on every occasion I have contacted them, I highly recommend the instrument…
Read More »
The Rudolph Research J457 refractometer monitors sample load quality, an industry first that assists the user in properly loading samples with a resulting increase in consistency and accuracy…
Read More »
Digital Refractometer, New from Rudolph Research; The J47 is Temperature correcting, and designed for the Sugar and Food industries. Very fast measurement Simple to load, simple to measure, simple to clean Result independent of operator judgment Rugged, reliable, and perfect for high throughput applications in the sugar and food industries. Accurate, on-board temperature correction Lower
Read More »
Refractometers, Polarimeters, and Density Meter Service & Maintenance Programs Whether you buy a Refractometer, Poalrimeter, Density Meter, Saccharimeter, or automated system, we protect your investment by providing exceptional service, for over 30 years. Even though many laboratory instrument manufacturers stop servicing their equipment after just 10 years, Rudolph Research Analytical is still servicing instruments built
Read More »
