Product Description
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)
Sealed stainless steel well with high-grade optical prism made of flint glass
Fast 1.5 second response time for temperature compensated readings
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
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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 μl)
Automatic Temperature Compensation (ATC)
Samples automatically compensated for temperature variations
Quick, accurate results
Readings are displayed in approximately 1.5 seconds
Dual-level LCD
The dual-level LCD displays measurement and temperature readings simultaneously
Stainless steel sample well
Easy to clean and corrosion-resistant
Battery indicators
Battery percent level remaining at startup and low battery indicator
Automatic shut-off
To conserve battery life the meter shuts off automatically after three minutes of non-use
IP65 water resistant protection
Water resistant ABS plastic casing designed to perform under laboratory and field conditions.
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
