HI96832 Digital Refractometer for Propylene Glycol Analysis

The HI96832 Digital Refractometer utilizes the measurement of refractive index to determine the percent volume and freezing points of propylene glycol based solutions. Propylene glycol is used in glycol chillers and dispensing systems intended for food applications, such as beer and wine. Maintaining the appropriate percent of glycol is important in glycol chillers as too low of a percentage could lead to the system freezing and rupturing while too much glycol will reduce the systems efficiency. The instrument converts the refractive index of a sample to percent volume or freezing point. These conversions are based on internationally recognized references for unit conversion and temperature compensation for glycol solutions (e.g. CRC Handbook of Chemistry and Physics, 87th Edition). The HI96832 is an easy-to-use tool for measuring freezing point and percent volume in propylene glycol solutions, on the production floor or in the lab. Designed for propylene glycol analysis Automatic Temperature Compensation 0 - 100% Volume range with ±0.3% accuracy 0 to -50 °C freezing point range with ±0.5 °C accuracy Making a Standard Solution To make an X % Propylene Glycol Solution, follow the procedure below: Place container (such as a glass vial or dropper bottle that has a cover) on an analytical balance. Tare the balance. Volumetrically add X mL of high purity propylene glycol (CAS #: 57-55-2; MW 76.09) to a 100 mL Grade A volumetric flask. Use distilled or deionized water to bring the flask close to the total volume, mix, allow the solution to return to room temperature. Once the solution has returned to room temperature use distilled or deionized water to bring the total volume to 100 mL. Mix solution well before use. Propylene Glycol Total Volume Expected Freezing Point Value 10 % V/V 10.00 mL 100.00 mL -3.4 °C (25.9 °F) 40 % V/V 40.00 mL 100.00 mL -21.3 °C (-6.3 °F) Measurement Units Freezing point is displayed as a temperature from 0.0 to -51.0 °C corresponding to 0-60 % by volume. When the display shows "LOin., the freezing point is at a minimum (below -51 °C). Refractive Index \ The HI96832 takes measurements based on a sample's refractive index. Refractive index is a measurement of how light behaves as it passes through the sample. Depending on the sample's composition, light will refract and reflect differently. By measuring this activity with a linear image sensor, the sample's refractive index can be assessed and used to determine its physical properties such as concentration and density. In addition to the linear image sensor, the HI96832 uses an LED light, prism and lens to make measurement possible. Variations in temperature will affect the accuracy of refractometry readings, so the use of temperature compensation is highly recommended for reliable results. The HI96832 contains a built-in temperature sensor and is programmed with temperature compensation algorithms in accordance with internationally recognized references which vary based on the parameter being measured. Features-at-a-glance One-point calibration Calibrate with distilled or deionized water Small sample size Sample size can be as small as 2 metric drops (100 ?l) Automatic Temperature Compensation (ATC)