Digital Refractometer for Propylene Glycol Analysis HI96832

HI96800

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The HI96832 is a rugged, portable digital refractometer designed for the measurement of percent volume and freezing point of propylene glycol based solutions.

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The HI96832 is a rugged, portable digital refractometer designed for the measurement of percent volume and freezing point of propylene glycol based solutions. The HI96832 has a high accuracy of ±0.2% volume and ±0.5 °C freezing point and features simple operation that gives reliable results each and every time. All readings are automatically compensated for temperature variations and displayed with a 1.5 second response time. The sealed flint glass prism and stainless steel well are easy to clean. Just wipe with a soft cloth in preparation for the next sample.

                                          Sample size as small as 2 metric drops (100 μl)

Sample size as small as 2 metric drops (100 μl)

                                         Sealed stainless steel well with high grade optical prism made of flint glass

Sealed stainless steel well with high-grade optical prism made of flint glass

                                              Fast 1.5 second response time for temperature compensated reading

Fast 1.5 second response time for temperature compensated readings

Details

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.

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)

 

refractive index

 

Specifications

Percent Volume Range (% V/V) 0 to 100%
Percent Volume Resolution (% V/V) 0.1 %
Percent Volume Accuracy (% V/V) @20°C/68°F ±0.3 %
Freezing Point Range 0 to -51 °C (32 to -59.8 °F)
Freezing Point Resolution 0.1 °C (0.1 °F)
Freezing Point Accuracy (@25°C/77°F) ±0.5 °C (±1.0 °F)
Temperature Range 0 to 80°C (32 to 176°F)
Temperature Resolution 0.1°C (0.1°F)
Temperature Accuracy ±0.3 °C (±0.5 °F)
Temperature Compensation automatic between 0 and 40°C (32 to 104°F)
Measurement Time approximately 1.5 seconds
Minimum Sample Volume 100 μL (to cover prism totally)
Light Source yellow LED
Sample Cell stainless steel ring and flint glass prism
Auto-off after three minutes of inactivity
Enclosure Rating IP65
Battery Type / Life 9V / approximately 5000 readings
Dimensions / Weight 192 x 102 x 67 mm (7.6 x 4.01 x 2.6”) / 420 g (14.8 oz.)
Ordering Information HI96832 is supplied with battery and instruction manual

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Digital Refractometer for Propylene Glycol Analysis  HI96832

Digital Refractometer for Propylene Glycol Analysis HI96832

The HI96832 is a rugged, portable digital refractometer designed for the measurement of percent volume and freezing point of propylene glycol based solutions.

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