Digital Refractometer for Propylene Glycol Analysis
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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 “LO”, 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
- Calibrate with distilled or deionized water
- Sample size can be as small as 2 metric drops (100 μl)
- Samples automatically compensated for temperature variations
- Readings are displayed in approximately 1.5 seconds
- The dual-level LCD displays measurement and temperature readings simultaneously
- Easy to clean and corrosion-resistant
- Battery percent level remaining at startup and low battery indicator
- To conserve battery life the meter shuts off automatically after three minutes of non-use
- Water resistant ABS plastic casing designed to perform under laboratory and field conditions.
Resources
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Specifications
Specification Name Detail SKU HI96832 Propylene Glycol Range 0 to 100% Propylene Glycol Resolution 0.001 Propylene Glycol Accuracy ±0.3 % Freezing Point (FP) Range 0 to -51°C (32 to -59.8°F) Freezing Point (FP) Resolution 0.1°C (0.1°F) Freezing Point (FP) Accuracy ±0.5°C (±1.0°F) Temperature Range 0.0 to 80.0°C (32.0 to 176.0°F) Temperature Resolution 0.1°C (0.1°F) Temperature Accuracy ±0.3°C (±0.5°F) Automatic Shut-Off after three minutes of non-use Battery Type / Life 9V / approximately 5000 readings Enclosure Rating IP65 Dimensions 192 x 102 x 67 mm (7.6 x 4.01 x 2.6”) Weight 420 g (14.8 oz.) Refractometer Light Source yellow LED Refractometer Temperature Compensation automatic between 10 and 40°C (50 to 104°F) Minimum Sample Volume 100 μL (to cover prism totally) Sample Cell stainless steel ring and flint glass prism Measurement Time approximately 1.5 seconds Ordering Information Supplied with battery and instruction manual. Warranty 2 years - Product Manuals
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