Groundwater sampling apparatus

Details Groundwater sampling apparatus Groundwater sampling apparatus

1989-02-02

1990-05-29

Raevis, Robert R.

Measuring and testing

Sampler, sample handling, etc.

Capture device

7386481, G01N 112

Patent

active

049285416

ABSTRACT:
The sampler includes a cylinder, plugged at the lower end, the plug having a first one-way check valve to permit the sample to flow upwards into the chamber. A piston is slidable in the bore, and includes a second one-way check valve, which permits the sample to flow upwards through the piston. In use, the sampler is pressurized from above, in order to hold both valves closed, and lowered to the correct depth; the pressure is released, and the sample flushes through the chamber of the sampler. The sampler is then re-pressurized, and drawn to the surface, with the sample remaining totally contained and maintained at depth-pressure. The sample may be transferred out of the chamber for analysis, by pressurizing the piston, without the sample losing its depth-pressure status.

REFERENCES:
patent: 2260419 (1941-10-01), Wrightsman
patent: 3892130 (1975-07-01), Winget et al.
patent: 3915677 (1975-10-01), Oppegaard
patent: 4406171 (1983-09-01), Ueberschaer
patent: 4625574 (1986-12-01), Robbins
patent: 4635487 (1987-01-01), Gowing

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