PURPOSE: To detect the automatic clouding point of a petroleum product with good accuracy by a method wherein a sample is injected into a sample container in which a thermometric body and a photelectric detector have been installed, the temperature of the sample is lowered and a temperature at which a change in a quantity of light reaches a specific value is measured.
CONSTITUTION: A sample container 3 in which a photoelectric sensor 1 for measurement and a platinum thermometeric body 2 for measurement have been set vertically is arranged inside a testing tank 5, and alcohol as a coolant which has been cooled in a cooling tank 10 is circulated inside the testing tank 5. A platinum thermometeric body 4 for temperature adjustment is inserted into the testing tank 5, the flow rate of the coolant is controlled via a solenoid valve 7 for temperature control, and temperature inside the tank is adjusted. When a clouding point is measured, the expected clouding point of a measuring sample is set, and a sample which has been set to a temperature higher than the clouding temperature by 14°C or higher is injected into the sample container 3. Then, the temperature of the sample is lowered, and between (Ta-1)°C which becomes 4mV or higher and a temperature Ta≥C at which the quantity of light entering a photodetector for the photoelectric sensor 1 starts to change suddenly, (Ta-1)°C is make to be the automatic clouding point.
KON SHIGERU
HASEGAWA KUNIHIRO
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