Measuring and testing – Sampler – sample handling – etc. – Capture device
Patent
1994-05-23
1995-10-03
Williams, Hezron E.
Measuring and testing
Sampler, sample handling, etc.
Capture device
166162, 166264, G01N 112
Patent
active
054542758
ABSTRACT:
A discrete groundwater sampler specifically designed to obtain a low-turbidity groundwater sample directly into the sample transport container, with minimal or no loss of dissolved volatile organic contaminants and no oxidation of dissolved inorganic contaminants, dissolved metals, or dissolved polychlorobiphenyls. The sampler relies on a differential in head-pressure between the fill and exhaust port tubes and an increased sampler can volume to allow overfill of the sample container, causing a flushing of the sample transport container a number of times before the actual sample to be analyzed is actually obtained in the sample transport container. Further, the sampler relies on pressure equilibrium to start and maintain flow through the fill tube; if pressure equilibrium is disturbed or not reached, filling is delayed until the sampler reaches an equilibrium point, usually by lowering it to the desired sampling depth. The sampler is constructed entirely from stainless steel, for non-reactivity with contaminants, ruggedness, and ease of decontamination.
REFERENCES:
patent: 4078433 (1978-03-01), McCabe, Jr. et al.
Dempsey et al., "Storage Hopper Sampling Device", IBM Technical Disclosure Bulletin, vol. 21, No. 11, pp. 4369-4370, Apr. 1979.
Mitchell et al., "Continuous Leak Water Sampler", AEC Research and Development Report, Union Carbide Nuclear Company, No. KY-423, pp. 1-3, Nov. 30, 1962.
Larkin Daniel S.
Williams Hezron E.
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