Vacuum operated sampler

Details Vacuum operated sampler Vacuum operated sampler

1976-08-02

1978-03-07

Swisher, S. Clement

Measuring and testing

Measuring vessel

G01N 114

Patent

active

040772632

ABSTRACT:
A vacuum pump controlled by a timer periodically evacuates a metering chamber to draw liquid samples into the chamber from a source. A switch is actuated when the liquid level reaches a predetermined point and causes the motor to stop. An electrically controlled valve is connected to the metering chamber above the level of the intake nozzle of the pump and is closed when the pump is operating and open when the pump is stopped, thereby allowing air to enter the upper part of the chamber to relieve the vacuum and allow the metered sample to flow out through an outlet tube to a sample receptacle. The outlet tube is controlled by a vacuum operated pinch valve to be closed during sample intake so that the pump will not have to evacuate the sample container before starting to draw liquid into the metering chamber.

REFERENCES:
patent: 3587670 (1971-06-01), Brailsford
patent: 3880011 (1975-04-01), Johnson
patent: 3901084 (1975-08-01), Brailsford
patent: 3901087 (1975-08-01), Fabritus

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