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The Cloud Point test cell is first flushed through with a fresh sample. A small amount of sample is then isolated in the cell and allowed to settle for a predetermined period to allow any air bubbles or solids to separate. The sample cell is then cooled at a controlled rate by a Peltier cooler with excess heat being removed by a coolant. An optical detector senses when the sample is starting to become cloudy as waxy components start to precipitate. The temperature at which this occurs is taken as the cloud point