Sampler device
A sampler device for gas chromatography includes a first unit that supports and moves a second, single instrument holding unit carrying at least two instruments with respective control plungers for taking/inserting samples to be analyzed, and a third unit that actuates the plungers simultaneously. The first unit is mounted on a base and moves the second and third units along horizontal and vertical directions and between a first and a second station, at least one of which is defined beyond the plan encumbrance of the base. A control unit automatically controls the movement of the first unit between the first station, with the third unit controlled by the control unit to simultaneously take the samples to be analyzed by the two instruments, and the second station, with the third unit controlled by the control unit to simultaneously insert the previously taken samples within two distinct injectors of a gas chromatograph.
1. An improved sampler device ( 2 ) for gas chromatography comprising:
a first unit ( 4 ) configured to support and move both a second, single instrument holding unit ( 41 ), on which at least two instruments are mounted, provided with respective control plungers ( 61 ′, 61 ″), for taking/inserting ( 6 ′, 6 ″) samples to be analyzed, and a third unit ( 42 ) configured to simultaneously actuate the respective control plungers ( 61 ′, 61 ″) of said at least two instruments ( 6 ′, 6 ″),
said first unit ( 4 ) extending upwardly from a base ( 5 ) that is structurally independent from a gas chromatograph and being configured to move said second ( 41 ) and third units ( 42 ) along at least one direction (X, Y) substantially horizontal and parallel to said base ( 5 ) and along a direction (Z) substantially vertical and perpendicular to said base ( 5 ),
said first unit ( 4 ) being also configured to move said second ( 41 ) and third units ( 42 ) between a first station ( 20 ) positioned on said base and a second station ( 22 ) positioned on the gas chromatograph, said second station ( 22 ) being defined beyond a plan encumbrance of said base ( 5 ) on which said first unit ( 4 ) is mounted; and
a control unit which automatically controls a movement of said first unit ( 4 ) between said first station ( 20 ), wherein said third unit ( 42 ) is controlled by said control unit to simultaneously take the samples to be analyzed by said at least two instruments, and said second station ( 22 ), wherein said third unit ( 42 ) is controlled by said control unit to simultaneously insert the samples previously taken by said at least two instruments ( 6 ′, 6 ″) within two distinct injectors ( 10 ′, 10 ″) of the gas chromatograph ( 3 ),
wherein the control unit automatically controls the movement of said first unit ( 4 ) so that:
in said first station ( 20 ), said at least two instruments ( 6 ′, 6 ″), mounted in said second unit ( 41 ), are vertically aligned to distinct corresponding containers with the samples to be taken, and
in said second station ( 22 ), said at least two instruments ( 6 ′, 6 ″), mounted in said second unit ( 41 ), are vertically aligned to the two injectors ( 10 ′, 10 ″) of the gas chromatograph ( 3 ),
wherein said base ( 5 ) comprises a shelf ( 7 ) for positioning at least one support plate ( 8 ′, 8 ″) provided with a plurality of seats for insertion and support of the containers with the samples to be taken, said first station ( 20 ) being defined at said shelf ( 7 ), and
wherein a center distance between said two instruments ( 6 ′, 6 ″) mounted on the second unit ( 41 ) corresponds to the center distance between the seats of said at least one support plate ( 8 ′, 8 ″).
2. The improved sampler device according to claim 1 , wherein said first unit ( 4 ) comprises at least one component ( 45 ) configured and/or sized so that said second unit ( 41 ) and said third unit ( 42 ) protrude with respect to a component ( 44 ) of said first unit which is movable parallel to said base ( 5 ).
3. The improved sampler device according to claim 1 , wherein the second unit ( 41 ) comprises a first element ( 50 ) which is provided with means ( 48 ) for supporting and fastening the at least two instruments, ( 6 ′, 6 ″) and with means ( 49 ) for removably fastening the at least two instruments to said first unit ( 4 ).
4. The improved sampler device according to claim 3 , wherein said means ( 48 ) for supporting and fastening the at least two instruments ( 6 ′, 6 ″) are provided, at a first face with said first element ( 50 ), while said means ( 49 ) for removably fastening to said support and movement unit ( 4 ) are provided, at a second face with said first element ( 50 ).
5. The improved sampler device according to claim 3 , wherein said means ( 48 ) for supporting and fastening the at least two instruments ( 6 ′, 6 ″) comprise at least two seats ( 51 ) for inserting/housing said instruments ( 6 ′, 6 ″) and members ( 47 ) configured to firmly lock said instruments in position.
6. The improved sampler device according to claim 1 , wherein the second unit ( 41 ) comprises guiding means for respective needles of said at least two instruments ( 6 ′, 6 ″).
7. The improved sampler device according to claim 1 , wherein said third unit ( 42 ) comprises a single actuator ( 70 ) connected to a mechanism ( 65 ) configured to produce a simultaneous translation of the control plungers ( 61 ′, 61 ″) of both of said instruments ( 6 ′, 6 ″).
8. The improved sampler device according to claim 7 , wherein said single actuator ( 70 ) is mounted on board the first unit ( 4 ).
9. The improved sampler device according to claim 7 , wherein said mechanism ( 65 ) is configured to transform a rotation of said single actuator ( 70 ), and/or of a transmission element ( 71 ) associated thereto, into a simultaneous translation of the control plungers ( 61 ′, 61 ″) of both of said instruments ( 6 ′, 6 ″).
10. The improved sampler device according to claim 1 , wherein said third unit ( 42 ) comprises first adjustment means ( 66 ′, 66 ″) configured to firmly lock in position the control plungers ( 61 ′, 61 ″) of both of said instruments ( 6 ′, 6 ″).
11. The improved sampler device according to claim 1 , wherein the third unit ( 42 ) comprises second adjustment means ( 67 ′, 67 ″) configured to vary a locking height of the control plungers ( 61 ′, 61 ″) of both of said instruments ( 6 ′, 6 ″) and thus adjust an amount of sample to be taken from said containers.
12. The improved sampler device according to claim 1 , wherein a center distance between said two instruments ( 6 ′, 6 ″) mounted on the second unit ( 41 ) corresponds to the center distance between the two distinct injectors ( 10 ′, 10 ″) of the gas chromatograph ( 3 ) in which the samples taken are intended to be inserted.
13. The improved sampler device according to claim 1 , wherein said instruments ( 6 ′, 6 ″) comprise at least two syringes or at least two probes with respective fibers for solid phase micro-extraction (SPME).
14. An analytical apparatus ( 1 ) comprising:
a sampler device ( 2 ) comprising:
a first unit ( 4 ) configured to support and move both a second, single instrument holding unit ( 41 ), on which at least two instruments are mounted, provided with respective control plungers ( 61 ′, 61 ″), for taking/inserting ( 6 ′, 6 ″) samples to be analyzed, and a third unit ( 42 ) configured to simultaneously actuate the respective control plungers ( 61 ′, 61 ″) of said at least two instruments ( 6 ′, 6 ″),
said first unit ( 4 ) extending upwardly from a base ( 5 ) that is structurally independent from a gas chromatograph and being configured to move said second ( 41 ) and third units ( 42 ) along at least one direction (X, Y) substantially horizontal and parallel to said base ( 5 ) and along a direction (Z) substantially vertical and perpendicular to said base ( 5 ),
said first unit ( 4 ) being also configured to move said second ( 41 ) and third units ( 42 ) between a first station ( 20 ) positioned on said base and a second station ( 22 ) positioned on the gas chromatograph, said second station ( 22 ) being defined beyond a plan encumbrance of said base ( 5 ) on which said first unit ( 4 ) is mounted; and
a control unit which automatically controls a movement of said first unit ( 4 ) between said first station ( 20 ), wherein said third unit ( 42 ) is controlled by said control unit to simultaneously take the samples to be analyzed by said at least two instruments, and said second station ( 22 ), wherein said third unit ( 42 ) is controlled by said control unit to simultaneously insert the samples previously taken by said at least two instruments ( 6 ′, 6 ″) within at least two distinct injectors ( 10 ′, 10 ″) of the gas chromatograph ( 3 ); and
the gas chromatograph ( 3 ) comprising the at least two distinct injectors ( 10 ′, 10 ″),
wherein the control unit automatically controls the movement of said first unit ( 4 ) so that:
in said first station ( 20 ), said at least two instruments ( 6 ′, 6 ″), mounted in said second unit ( 41 ), are vertically aligned to distinct corresponding containers with the samples to be taken, and
in said second station ( 22 ), said at least two instruments ( 6 ′, 6 ″), mounted in said second unit ( 41 ), are vertically aligned to the two injectors ( 10 ′, 10 ″) of the gas chromatograph ( 3 ),
wherein said base ( 5 ) comprises a shelf ( 7 ) for positioning at least one support plate ( 8 ′, 8 ″) provided with a plurality of seats for insertion and support of the containers with the samples to be taken, said first station ( 20 ) being defined at said shelf ( 7 ), and
wherein a center distance between said two instruments ( 6 ′, 6 ″) mounted on the second unit ( 41 ) corresponds to the center distance between the seats of said at least one support plate ( 8 ′, 8 ″).
15. The analytical apparatus according to claim 14 , wherein said at least two distinct injectors ( 10 ′, 10 ″) are fastened to a same plate, which in turn is fastened to a surface of a casing of the gas chromatograph ( 3 ).
16. The analytical apparatus according to claim 14 , wherein a center distance between said at least two instruments ( 6 ′, 6 ″) mounted on the second ( 41 ) of said sampler device ( 2 ) corresponds to a center distance between two inlet axial cavities ( 86 ′, 86 ″) of said injectors ( 10 ′, 10 ″) of the gas chromatograph ( 3 ).
17. The analytical apparatus according to claim 16 , wherein the center distance between said at least instruments ( 6 ′, 6 ″) mounted on the second unit ( 41 ) of said sampler device ( 2 ) corresponds to the center distance between the two inlet axial cavities ( 86 ′, 86 ″) of said injectors ( 10 ′, 10 ″) of the gas chromatograph ( 3 ) and also corresponds to a center distance of seats which are defined in support plates ( 8 ′, 8 ″) comprises in said base and in which containers with the sample or a washing liquid to be taken by said at least two instruments are inserted.