ASTM D5972 Freezing Point of Aviation Fuels (Automatic Phase Transition Method)
10. Procedure
10.1 Open the test chamber lid and clean the specimen cup inside the test chamber with a cotton swab.
10.2 Rinse the specimen cup by pipetting 0.15 +/- 0.01 mL of specimen into the cup. Clean the specimen out of the cup by using a cotton swab. The cup should be cleaned to the point where no visible droplets of specimen remain in the cup.
10.3 Rinse the cup a second time by repeating 10.2.
10.4 Carefully measure 0.15 +/- 0.01 mL of specimen into the specimen cup.
10.5 Close and lock the test chamber lid.
10.6 Start the operation of the apparatus according to the manufacturer's instructions. From this point up to and including the termination of the measurement, the apparatus automatically controls all operations. Purge gas and liquid cooling medium will begin to flow through the apparatus. The Peltier device cools the specimen at a rate of 15 +/- 5°C/min. The optical detectors continuously monitor the specimen for the formation of hydrocarbon crystals. The temperature of the specimen is continuously monitored by the apparatus and displayed on its front panel. Once hydrocarbon crystals are detected, the specimen is then warmed at 10 +/- 0.5°C/min until all the crystals redissolve into the liquid phase. When the disappearance of the last crystals is detected, the specimen temperature is recorded and the measurement is terminated.
10.7 The freezing point value will be displayed by the apparatus.
10.8 Unlock and open the test chamber lid and clean the specimen out of the specimen cup with a cotton swab.
