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Pro-Juice Refractometers

Ultimate measurement performance for re-constituted orange juice

The Pro-Juice refractometer has been specifically developed to overcome the erratic behavior of orange juice by focusing on the practical handling of the sample prior to high accuracy measurement in order to achieve a measurement accuracy of 0.01 °Brix for sucrose solutions and more importantly, a reproducibility of 0.02 °Brix between orange juice samples, regardless of temperature deviation or operator skill level.

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For many years, beverage manufacturers have adopted digital refractometers as their primary instrument for measuring the final dilution ratio (°Brix) of re-constituted fruit juice not only to assure product quality but also in an attempt to reduce losses by tightly controlling concentrate yields. For most fruit types this has been successful but for one of the most commonly produced juices, the high accuracy measurement achieved by latest technology digital refractometers has unmasked an erratic behavior within an orange juice sample that prevents tighter dilution control, which in turn negates any opportunity of cost reduction by way of lowering target values without the risk of compromising minimum specifications defined by regulation.

Key to the performance of the Pro-Juice is the new Xycone® flowcell chamber that is especially shaped to prevent air bubbles forming on the prism surface during rapid sample transfer. Additionally, the sample inlet is specifically orientated to effect rapid and absolute cleaning of the prism between measurement cycles, contributing to the instrument’s high measurement performance when used in the Pro-Juice mode. For conventional measurement of non problematic juices and for occasional cleaning, the Xycone® cell is easily removed by using the catch at the front of the cell and hinging it back to reveal the prism. 

Methods within the Pro-Juice tightly control analysis from start to finish. The Pro-Juice method provides on-screen prompts to guide the operator through every step of the measurement with the result only being displayed once all criteria has been met, including the critical cleaning process that prevents cross contamination occurring between readings or cleaning cycles. 

The typical reading time for the Pro-Juice to display the Brix of an orange analysis is only 180 seconds, even when the temperature deviation between instrument and sample is as high as 15°C, including sample conditioning and post measurement cleaning cycles.