Measuring and testing – Sampler – sample handling – etc. – Conduit or passageway section capture chamber
Patent
1983-03-03
1985-03-26
Swisher, S. Clement
Measuring and testing
Sampler, sample handling, etc.
Conduit or passageway section capture chamber
7386483, G01N 110
Patent
active
045065586
ABSTRACT:
An injector is described for injecting a sample at a high pressure into a chromatographic column, which avoids sample dilution that is characteristic of bypass loop injectors, and which also avoids significant flow interruption into the column that is characteristic of prior non-bypass injectors. The stator includes pump and column ports with openings (34a, 42a, FIG. 4) at the stator-rotor interface, where the openings are spaced by a small angle (m) of less than 10.degree. from one another. In the load position, a channel (50) formed in the interface surface of the rotor, which connects the pump and column openings in the load position, extends away from the pump opening by an angle (n) which is many times greater than the angle between the pump and column openings. As a result, as the injector is turned toward the inject position, the channel (50) continues to connect the pump and column openings until the rotor is close to the inject position. As the inject position is approached (FIG. 8), the trailing edge (50t) of the channel passes beyond the pump openings (34 a), while the leading edge (50f) of the channel connects to a sample opening (the channel is always connected to the column opening (42a). Thus, when the rotor is rapidly turned from load to inject positions, there is only a very brief interruption of liquid flow into the column.
REFERENCES:
patent: 3393551 (1968-07-01), Todd et al.
patent: 3630371 (1971-12-01), Hedina
patent: 3961534 (1976-06-01), Gundelfinger
patent: 4068528 (1978-01-01), Gundelfinger
patent: 4182184 (1980-01-01), Bakalyar et al.
patent: 4393726 (1983-07-01), Tomm et al.
Noland Tom
Rheodyne Incorporated
Swisher S. Clement
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