Automatic control system for vacuum loop sample injection system

Details Automatic control system for vacuum loop sample injection system Automatic control system for vacuum loop sample injection system

1976-09-30

1977-06-21

Swisher, S. Clement

Measuring and testing

Measuring vessel

G01N 122

Patent

active

040303691

ABSTRACT:
A vacuum loop sample injection system, for use with gas chromatographs and other similar analyzer devices, in which the sample volume is collected within an enclosure having a known pressure, temperature, and volume so that the molecular quantity of a sample is used for each chromatograph test. The sample injection system operates by creating a vacuum within this enclosure and using this vacuum to slowly draw the sample in through a restriction until the predetermined pressure is obtained. The enclosure can be evacuated again by the vacuum source and refilled with the sample as many times as desired to wash any impurities out of the enclosure. Then the enclosure is placed in stream with the carrier gas for injection of the sample into the sample analyzer.
An automatic system for controlling the injection system operation is provided wherein a given number of sample containers can be connected to the system and a sequential operation commenced to inject the sample into the sample analyzer. The system permits the number of rinses for each enclosure and the number of injections of each sample, after a series of rinsing cycles, to be preselected and automatically ceases operation when the sample from the last container has been injected the preset number of times.

REFERENCES:
patent: 2964938 (1960-12-01), Fuller
patent: 3501961 (1970-03-01), Hable
patent: 3915013 (1975-10-01), Gaeke

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