Refractometer Selection Guide from Rudolph Research Analytical
Our Refractometer Selection guide can assist you in determining the requirements for your application and an instrument that will be a good fit for your lab. Rudolph Research designs and manufactures Automatic, Digital, Benchtop, Refractometers to meet the standards of the most demanding laboratories around the world. Our capable instruments offer features not offered by any other manufacturer and will meet with your requirements across a wide range of industry applications. You may use this guide or call one of refractometer specialists to select the right instrument for your needs.
10 Refractometer Models in various configurations, for your industry and application.
Every industry including Food, Beverage, Fragrance, Sugar milling, Refining, Processing, Petroleum, Chemical, Pharmaceutical, Flavor, Cosmetics, and Toxicology testing, has its unique application requirements, environmental constraints and operator handling issues with which to contend. It is for this reason, that┬аRudolph Research has more than 10 different automatic, benchtop, digital, refractometers with various model configurations for high throughput, high accuracy applications, across various industries┬аto ensure that we have the right refractometer solution for your laboratory situation.
Wide-Range, High Accuracy Refractometers for Pharmaceutical, Toxicology, Flavor, and Fragrance Labs.
Maybe you need a wider range instrument for a┬аpharmaceutical industry┬аapplication and looking for an instrument which can┬аmeasure below the standard food┬аRefractive Index (RI) range┬аof 1.33 тАУ 1.53 to comply with the USP monograph for Sevoflurane (refractive index range of 1.2745 тАУ 1.2760) or other halogenated ethers and pharmaceuticals┬аmeasuring below 1.3 RI. Maybe youтАЩre a┬аflavor, fragrance or essential oil manufacturer or blender┬аdealing with Cinnamic Aldehyde or the many products in this industry having┬аa Refractive Index (RI) greater than 1.60 RI/products.
Possibly your main concern is not the available range of measurement but the┬аreproducibility of results┬атАФ just listen to what one of our customers has to say after switching to a Rudolph instrument after years with another brand:
тАЬJust wanted to let you know how pleased our company is with the┬аJ57HA Automatic. We currently have two of the instruments in service in our sugar testing laboratories and are in the process of ordering three additional refractometers. Before the decision was made to switch our laboratories to the┬аJ57HA, rigorous testing was done on the instrument over the past year in our Quality/Research Laboratory.
It has been our policy when doing research type work, using our old refractometers, that we place a sample on the prism, set a timer for two minutes, then press the тАЬReadтАЭ button until we get three readings in a row that are identical (this could take up to 12 readings). With the J57HA instrument, we place the sample on the prism, press the тАЬMeasureтАЭ button and in about 15 seconds we have a stable number. The instrument is so stable in fact, that I can honestly say after using the instrument for over a year, we have never had a different reading from the original measurement, no matter how many times we repeatedly press the тАЬMeasureтАЭ button.тАЭ
тАФ R.R., Senior Process Chemist, Western Sugar Cooperative
How to Use Rudolph Research AnalyticalтАЩs Guide to Benchtop Refractometers and Industry applications
Although there are many common complications in taking accurate readings that are similar across all industries: like sample cleaning, sample cross contamination, dirty prism, improper water zero,┬аsome problems are unique or have a different level of importance to a particular industry. This guide to RudolphтАЩs line of electronic laboratory refractometers will allow you to see which instruments are best suited to your industry and why. Just select the category that best reflects your industry and then┬аcontact us┬аto help solidify your model selection. Our technical sales representatives understand that the┬аinitial price is an important part of the purchasing decision┬аbut only part of that decision; equally, if not more important is┬аpurchasing an instrument that works as intended for the application, and meets all relevant standards, regulations and requirements┬аin the area in which you work.
Refractometers with The Rudolph Research Advantage
Below are a few of the reasons demanding laboratories replaced their older instrument with a J-Series digital bench top instrument from Rudolph Research Analytical.
Problem |
Solution |
|---|---|
┬а You are tired of arguments over shadow-line interpretation on your Abbe refractometer .┬аOne person says the material is on specification, one person says itтАЩs not. In addition,┬аscratches on the glass┬аprism make visual interpretation even more difficult. |
The digital J-Series benchtop Total Internal Reflection ( TIR ) instruments use scratch proof artificial sapphire prisms that measure the reflected light and not the transmitted light, like the Abbe, so dark samples measure as easily as clear samples. Just put a drop of sample on the prism, press measure, and walk away. No shadow line, no manual balancing or interpretation. When readings are critical to your end product a quality bench-top instrument from Rudolph Research in your laboratory saves you time and concern over inaccurate readings. |
 Waterbath maintenance is costly and time consuming.┬аTheoretically it should be easy тАФ just top it off with water every week, clean it out and add new algaecide once a month. So why does the bath always seem to be low on water and covered with green slime? |
┬аThe J-Series automatic refractometers have an electronic peltier temperature control solution that has antiquated water bath systems.┬аSelect your temperature through the touch screen and watch the instrument quickly come to temperature and automatically return a digitally displayed measurement all in one easy step. Your concerns about inaccurate readings due to inconsistent temperature control and time-consuming water bath maintenance issues are a thing of the past. |
 Your old refractometer was great when you bought it but now it is being repaired more and more often while measurement instability wastes time and money.┬аIn between repairs you canтАЩt even be sure your current instrument is delivering accurate readings. |
Our customers say it best:┬а тАЬThis J57HA has greatly reduced our sample time and improved our accuracy.┬аCalibration┬аof the instrument is easy and rarely required. We have had no problems or issues with the two instruments that we currently have in serviceтАж I would highly recommend the Electronic Rudolph J57HA over any other brand of refractometer that I have used or tested throughout my many years working in the sugar industry.тАЭ |
Why switch to one of Rudolph Research refractometers? Superior temperature control and easy to clean prism
RudolphтАЩs Dual Temperature Control System
Rudolph Research Analytical is the only manufacturer to offer┬аdemanding laboratories, electronic temperature control from both prism and presser surfaces. The requirements of an electronically temperature controlled instrument operating close to ambient air temperature are very different from the temperature control requirements of an instrument operating more than 10┬░C from ambient air temperature. Only the Rudolph J Series is designed to be the perfect instrument for both applications.
Measuring RI or BRIX Close to Ambient Air Temperature
The Rudolph J57тАЩs shallow sample well and presserless design makes cleaning easier than deep well prism designs while still maintaining the high level accuracy you require from an automatic, digital instrument.┬аThe deep sample well of competing brands is not needed when there is less than a 10┬░C difference between the prism temperature and air temperature because the temperature gradient across the sample is small.
Measuring RI or Brix Far from Ambient Air Temperature
The Rudolph Research┬аJ157,┬аJ257, J357┬а and J457 modelтАЩs shallow well with temperature control from both the sample presser and prism surface offer┬аsuperior temperature control while still maintaining ease of cleaning. RudolphтАЩs temperature controlled presser creates a mini, temperature controlled environment where the entire sample is held at the measurement temperature. This design┬аminimizes the inaccuracies┬аcreated by temperature gradients across the sample as deep well prisms fight to control temperature from the prism surface while the air and upper part of the sample have widely divergent temperatures.
Other ManufacturersтАЩ Compromise the Refractometer sample well design
From the pictures below one can see that┬аother manufacturers have to make a compromise with the depth and angle of sample well.┬аSince these manufacturers use one sample well and cover design for both temperature applications, they end up with a┬аsample well that is too narrow and deep. The deep sample well makes cleaning needlessly hard┬аat ambient temperature while failing to provide ideal temperature control when the sample and air temperature are more than 10┬░C from the desired measurement temperature.
Refractometers that assist the user in validating sample load quality. Introducing тАЬSmart MeasureтАЭ
Rudolph Research introduced new тАЬSmart MeasureтАЭ technology in 2010, a first-of-its-kind system designed to assist the refractometer user monitor the sample being loaded in the refractometer sample well. . Smart Measure automatically monitors the refractometerтАЩs sample well and gives the user immediate feedback about the quality of the sample. Incorrect measurements due to improper sample loading are virtually eliminated. Smart Measure works by automatically detecting when the refractometer prism is improperly cleaned, insufficient sample is loaded, or if the instrument is improperly calibrated. Smart Measure is another Refractometer innovation and available in our latest generation refractometer the Rudolph Research J457
Rudolph Research Analytical┬аmanufactures automatic, digital, bench-top laboratory refractometers for a wide variety of industries. With over 5,000 laboratory instruments installed in demanding applications worldwide and many still in use for over 25 years, we are well known for our reliability, and quality standards. As perpetual innovators we are known to set the pace in our industry for the design and functionality of bench-top laboratory instruments. Our service and responsiveness come from a deep commitment to integrity that we have maintained for over 50 years. Just ask our customers!
