ASTM D5006 Test Method for Measurement of Fuel System Icing Inhibitors (Ether Type) in Aviation Fuels
6. Apparatus
6.1 Refractometer - An optical instrument used to measure the physical properties of a solution. Refractometers suitable for use in this test method include:
6.1.1 HB Refractometer - An analog refractometer with a direct reading scale for percent DiEGME. This instrument is automatically temperature compensated from 18 to 35°C.
6.1.2 Brix Refractometer - An analog refractometer with a Brix scale which may or may not be automatically temperature compensated.
6.1.3 MISCO Jet Fuel Refractometer (p/n JPX-DiEGME) - A digital refractometer that provides a direct reading of DiEGME concentration and is automatically temperature compensated within the range of 10 to 45°C.
6.1.4 Gammon HB2D Refractometer - A digital refractometer that provides a direct reading of DiEGME concentration and is automatically temperature compensated within the range of 10 to 40°C.
6.2 Extraction Vessel - Any suitable vessel of at least 200 mL with provisions for isolating a small column of water extract at the bottom. Examples are separatory funnels, (glass or plastic), or plastic dropping bottles.
6.3 Measuring Vessel - Any vessel capable of measuring up to 160 mL of fuel to an accuracy of +/- 2 mL, such as a 250-mL graduated cylinder, or other calibrated container.
6.4 Water Dispenser - 2.0-mL pipettes are preferred, but syringes or burettes not exceeding 5.0-mL capacity that can dispense 2.0 +/- 0.2 mL may be used. For the Brix refractometer, the pipette must measure 1.0 +/- 0.1 mL.
6.5 Thermometer - The thermometer must have suitable range to measure air and fuel temperature in the field. Accurate to +/- 1°C and meeting Specification E1 or any other temperature measuring device that cover the temperature range of interest, such as thermocouples, thermistors, resistance temperature detectors (RTDs) or one conforming to Specification E2251 may be used that provides equivalent or better accuracy and precision than ASTM 1C.
7. Reagents and Materials
7.1 Water - Distilled or deionized water is preferred for the extraction procedure, and for refractometer calibration, but potable water may be used.
