Digital Refractometer for Ethylene Glycol Analysis

SKU : 0eb0845b3484

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.

  • Sample size as small as 2 metric drops (100 ?l)
  • Sealed stainless steel well with high-grade optical prism made of flint glass
  • Fast 1.5 second response time for temperature compensated readings
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Deskripsi

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.
 Ethylene GlycolTotal VolumeExpected Freezing Point Value
10 % V/V10.00 mL100.00 mL-3.8 °C (25.2 °F)
40 % V/V40.00 mL100.00 mL-26.3 °C (-15.4 °F)

Measurement Units

brix-measurement-unit-chart

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).

Refractive Index

Refractive_Index_Diagrams

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 accuracy of refractometry readings, so the use of temperature compensation is highly recommended for reliable results. The HI96831 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.

 

 

 

Specification NameDetail
SKUHI96831
Ethylene Glycol Range0 to 100%
Ethylene Glycol Resolution0.001
Ethylene Glycol Accuracy±0.2 %
Freezing Point (FP) Range0 to -50°C (32 to -58°F)
Freezing Point (FP) Resolution0.1°C (0.1°F)
Freezing Point (FP) Accuracy±0.5°C (±1.0°F)
Temperature Range0.0 to 80.0°C (32.0 to 176.0°F)
Temperature Resolution0.1°C (0.1°F)
Temperature Accuracy±0.3°C (±0.5°F)
Automatic Shut-Offafter three minutes of non-use
Battery Type / Life 9V / approximately 5000 readings
Enclosure RatingIP65
Dimensions192 x 102 x 67 mm (7.6 x 4.01 x 2.6”)
Weight420 g (14.8 oz.)
Refractometer Light Sourceyellow LED
Refractometer Temperature Compensationautomatic between 10 and 40°C (50 to 104°F)
Minimum Sample Volume100 ?L (to cover prism totally)
Sample Cellstainless steel ring and flint glass prism
Measurement Timeapproximately 1.5 seconds
Ordering InformationSupplied with battery and instruction manual.
Warranty 2 years