| 摘要 |
PURPOSE:To eliminate the need for complicate operation and a large-scale device and to measure the accurate pour point of a sample by applying pressure to the sample put in a sample container, and allowing a pressure measuring mechanism to detect the rise of the sample in a vent pipe. CONSTITUTION:When pressurized air presses the surface of the sample S, the sample S rises in the vent pipe 4 and a pressure application detector 7 detects the rise in liquid level. Then, when the detector 7 detects it, solenoid valves 13 and 15 are closed and solenoid valves 19 and 20 are opened to return the sample to the state before the pressure application while the temperature begins to be displayed. Further, when the temperature of the sample S drops by, for example, 1 deg.C, the display is stopped again and the pressure applying and detecting operation is performed. This operation is repeated until the detector 7 does not detects fluctuations of the surface of the sample S. Then, when the fluctuations are not detected any more, the temperature display is stopped 5sec later, and in this state the solenoid valves 13 and 15 are closed and the solenoid valves 19 and 20 are opened to stop cooling. The temperature displayed at this time is a freezing point and 1 deg.C is added to this value to obtain the pour point. |
