| 摘要 |
A thermostatically controlled enclosure (7) comprises, secured therein, a rigid body comprising two cylindrical chambers (14, 15) havin a pointed bottom for example, linked together by a slender channel controlled by a valve V5. Two rods (18, 17) forming pistons and having prestressed sealing joints (J), are slidable, separately or coupled to one another, in both chambers. Their shape matches the base of the chambers. The rods are shifted by the vertical displacement of clamps (12, 13) made integral by threaded rods (8, 10) controllably rotated by motors (ME1, ME2). A control assembly comprises two viewing and optical tracking units (19, 20), which pass through the body in the region of the base of the lower chamber (14), and microcomputer-controlled pressure, temperature and displacement sensors for performing precise themodynamic measurements on samples of pressurized substances at high temperatures. Preferably, a gas holder is arranged in the enclosure (7). In one embodiment, the upper chamber can be replaced by a gas holder for validating samples.
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