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SKU HI96831 Category

Digital Refractometer for Ethylene Glycol Analysis - HI96831

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The HI96831 is a rugged, portable digital refractometer designed for the measurement of percent volume and freezing point of ethylene glycol based solutions. The HI96831 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 within 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.

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 189,00

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The HI96831 Digital Refractometer utilizes the measurement of refractive index to determine the percent volume and freezing points of ethylene glycol based solutions. Ethylene glycol is used in glycol cooling systems for industrial applications. 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 HI96831 is an easy-to-use tool for measuring freezing point and percent volume in ethylene glycol solutions, in the field or in the lab.

  • Designed for ethylene glycol analysis
  • Automatic Temperature Compensation
  • 0 – 100% Volume range with ±0.2% accuracy
  • 0 to -50 °C freezing point range with ±0.5 °C accuracy

Making a Standard Solution

To make an Ethylene 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 ethylene glycol (CAS #: 107-21-1; MW 62.068) 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.
Refractive Index

Refractive Index

The HI96831 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 HI96831 uses an LED light, prism and lens to make measurement possible.

Variations in temperature will affect the density of a solution based on the compound that is present. In digital refractometry the use of temperature compensation is necessary for accurate results. The HI96831 contains a built-in temperature sensor and is programmed with temperature compensation algorithms in accordance with the ICUMSA Methods Book for a percent by weight sucrose solution.

Glycol table

Measurement Units

Freezing point is displayed as a temperature from 0.0 to -50.0 °C corresponding to 0-58 % by volume. The display blinks the freezing point when the concentration of Ethylene glycol is greater than 78 % concentration by volume. When the display shows “LO”, the freezing point is at a minimum (below -50 °C).

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 indicator
    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

  • Stainless steel sample well
    Easy to clean and corrosion-resistant

  • IP65 water resistant protection
    Water resistant ABS plastic casing designed to perform under laboratory and field conditions.

Specifications

Ethylene Glycol

Range

0 to 100%

Resolution

0.1 %

Accuracy

±0.2 %

Freezing point

Range

0 to -50°C 

Resolution

0.1°C (0.1°F)

Accuracy

±0.5 °C (±0.5 °F)

Temperature 

Range

0 to 80°C (32 to 176°F)

Resolution

0.1°C (0.1°F)

Accuracy

±0.3 °C (±0.5 °F)

Temperature Compensation

automatic between 10 and 40°C (50 to 104°F)

Additional Specifications

Minimum Sample Volume

100 μL (to cover prism totally)

Sample Cell

stainless steel ring and flint glass prism

Measurement Time

approximately 1.5 seconds

Battery Type

9V / approximately 5000 readings

Auto-off

after three minutes of inactivity

Refractometer Light Source

yellow LED

Dimensions

192 x 102 x 67 mm (7.6 x 4.01 x 2.6”)

Weight

420 g (14.8 oz.)

Ordering information

HI96831 is supplied with battery and instruction manual

Additional Informations

Additional information

Specific parameter

Industry

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