Digital Refractometer for Ethylene Glycol Analysis - HI96831

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Digital Refractometer for Ethylene Glycol Analysis - HI96831

$175.00

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 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 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

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).



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 Glycol Total Volume Expected Freezing Point Value
10% V/V 10.00 mL 100.00 mL -3.8 °C (25.2 °F)
40% V/V 40.00 mL 100.00 mL -26.3 °C (-15.4 °F)
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 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.

 

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 measurements 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.
Ethylene Glycol Range 0 to 100%
Ethylene Glycol Resolution 0.1 %
Ethylene Glycol Accuracy ±0.2 %
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)
Automatic Shut-Off after three minutes of inactivity
Battery Type/Life 9V / approximately 5000 readings
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
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 HI96831 is supplied with battery and instruction manual
Notes Enclosure Rating: IP65

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