An automatic sample introduction device includes a needle, a sample loop, a mixer and a suction injection switch mechanism. The mixer is provided between the needle and the sample loop. The suction injection switch mechanism sequentially sucks first and second fluids into the sample loop through the needle and the mixer and injects the first and second fluids held in the sample loop into a predetermined injection port. A chromatograph includes the automatic sample introduction device having the above-mentioned configuration, an analysis column and a detector. The analysis column is connected to the injection port of the automatic sample introduction device, and the detector is connected to the analysis column.

A supercritical fluid separation apparatus performs feedback control of output of a heater so that a separation part temperature becomes a set temperature, based on both output of a first temperature sensor that measures a heating block temperature and output of a second temperature sensor that measures the separation part temperature. When a difference between the separation part temperature and the set temperature is large (equal to or more than a predetermined value), output of the heater is adjusted based on the heating block temperature. When a difference between the separation part temperature and the set temperature becomes small (less than a predetermined value), the output of the heater is adjusted based on the difference.

A member linking mechanism, pairable with a gas chromatograph, which has a small and simple configuration, and is capable of linking two members together with a required fastening force even in a limited space. The member linking mechanism includes a first member having a member linking part with an opening at its distal-end surface; a second member to be linked to the member linking part of the first member; an elastic sealing member sandwiched between the first and second members so as to seal the opening of the distal-end surface of the member linking part; and a linking member for linking the first and second members together via pressure. The linking member includes: a linking member body configured to hold an end part, of the second member, adjacent to the first member; and an elastic deformation part provided to the linking member body.

A member linking mechanism, pairable with a gas chromatograph, which has a small and simple configuration, and is capable of linking two members together with a required fastening force even in a limited space. The member linking mechanism includes a first member having a member linking part with an opening at its distal-end surface; a second member to be linked to the member linking part of the first member; an elastic sealing member sandwiched between the first and second members so as to seal the opening of the distal-end surface of the member linking part; and a linking member for linking the first and second members together via pressure. The linking member includes: a linking member body configured to hold an end part, of the second member, adjacent to the first member; and an elastic deformation part provided to the linking member body.

In a sample injection device (100), a controller (23) is configured or programmed to control a syringe drive (21) such that in a penetration operation in which a syringe (10) is moved to a side of a sample introduction portion (910) and a needle (11) penetrates a lid member (911), a moving speed at a time when a tip (11b) of the needle contacts the lid member is a second moving speed that is low.

In a sample injection device (100), a controller (23) is configured or programmed to control a syringe drive (21) such that in a penetration operation in which a syringe (10) is moved to a side of a sample introduction portion (910) and a needle (11) penetrates a lid member (911), a moving speed at a time when a tip (11b) of the needle contacts the lid member is a second moving speed that is low.

When mounting a second assembly 36 to a first assembly 35 that is fixed to a main body, the second assembly 36 engages a second connection element 54 of a non-rotation unit 361 of the second assembly 36 with a first connection element 354 of the first assembly 35. A rotating part 362 is mounted on the first assembly 35 when the rotation unit 362 is rotated. Therefore, an operator can carry out positioning for the second assembly 36 by connecting the second connection element 54 of the second assembly 36 with the first connection element 354 of the first assembly 35. The second assembly 36 can be smoothly mounted on the first assembly 35 that is fixed to the main body. The second connection element 54 of the non-rotation unit 361 connects with the first connection element 354 of the first assembly 35, so that the non-rotation unit 361 is prevented from rotating together with the rotation unit 362 during use and the assemblies that contact the non-rotation unit 361 are protected from damage.

When mounting a second assembly 36 to a first assembly 35 that is fixed to a main body, the second assembly 36 engages a second connection element 54 of a non-rotation unit 361 of the second assembly 36 with a first connection element 354 of the first assembly 35. A rotating part 362 is mounted on the first assembly 35 when the rotation unit 362 is rotated. Therefore, an operator can carry out positioning for the second assembly 36 by connecting the second connection element 54 of the second assembly 36 with the first connection element 354 of the first assembly 35. The second assembly 36 can be smoothly mounted on the first assembly 35 that is fixed to the main body. The second connection element 54 of the non-rotation unit 361 connects with the first connection element 354 of the first assembly 35, so that the non-rotation unit 361 is prevented from rotating together with the rotation unit 362 during use and the assemblies that contact the non-rotation unit 361 are protected from damage.

A septum containing a duckbill valve assembly includes a plurality of elastomeric ribs extending from the body of the septum to the duckbill valve assembly. When inserted into an injection port cavity, force generated by an interference fit between the body of the septum and the cavity is transmitted by the ribs to the duckbill valve assembly. The ribs are configured to reversibly collapse at a hinge point when a needle is inserted through the duckbill valve assembly and are spaced to assist in centering the needle in the duckbill valve assembly. The ribs reduce wear on the duckbill valve assembly by reducing the concentration of compressive forces at higher inlet pressures while maintaining sufficient compressive force to close the duckbill valve assembly at lower inlet pressures.

A septum containing a duckbill valve assembly includes a plurality of elastomeric ribs extending from the body of the septum to the duckbill valve assembly. When inserted into an injection port cavity, force generated by an interference fit between the body of the septum and the cavity is transmitted by the ribs to the duckbill valve assembly. The ribs are configured to reversibly collapse at a hinge point when a needle is inserted through the duckbill valve assembly and are spaced to assist in centering the needle in the duckbill valve assembly. The ribs reduce wear on the duckbill valve assembly by reducing the concentration of compressive forces at higher inlet pressures while maintaining sufficient compressive force to close the duckbill valve assembly at lower inlet pressures.