Digital refractometer for ethylene and propylene glycol analysis are
rugged, portable, water resistant devices that utilize the measurement of
fractive index to determine the percent volume and freezing point of ethylene
or propylene glycol based solutions. These digital refractometers eliminate the
uncertainty associated with mechanical fractometer.
Digital refractometer for ethylene and propylene glycol samples are
measured after a simple user calibration with distilled or deionized water.
Within seconds, the refractive index and temperature are measured and converted
into one of two measurement units : percent volume or freezing point. These
meters use internationally recognized references for unit conversion and
temperature compensation for glycol solution(e.g. CRC handbook of Chemistry and
Physics, 87th edition).
How to Make a Standard Solution of ethylene Glycol. Simplyd step by step below.
- Place clean and accurate container such as a glass vial or dropper bottle that has a cover on an analytical balance.
- Tare the balance to zero.
- Volumetrically add millilitre of high purity ethylene glycol to a one hundred millilitre Grade Lab volumetric flask.
- Use distilled or deionized water to bring the flask close to the total volume, mix the solution together, and 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 one hundred millilitre. Mix solution well before use.
| Ethylene Glycol | Total Volume | Expected Freezing Point Value | |
| 10% V/V | ten millilitre | one hundred mL. | -3.8 °C (25.2 °F) |
| 40% V/V | fourty millilitre | one hundred mL. | -26.3 °C (-15.4 °F) |
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