Measuring and testing – Sampler – sample handling – etc. – Conduit or passageway section capture chamber
Patent
1986-12-16
1989-04-25
Levy, Stewart J.
Measuring and testing
Sampler, sample handling, etc.
Conduit or passageway section capture chamber
7386422, G01N 114
Patent
active
048236225
ABSTRACT:
A sample metering valve for both liquid samples and slurry samples with entrained gas bubbles. The sample metering valve for liquids is comprised of a piston with sample chambers formed in the side thereof said piston moving freely into and out of a cylinder having an aperture matching the size of the piston. Sealing is provided by a seal which has no dead volume which cold flows under a spring bias to maintain the seal under various operating conditions. The sample metering valve for slurry samples includes a syringe embodiment having separately moving piston and valve in a cylinder. The syringe valve sucks up sample with a piston, isolates the sample with the valve and compresses the entrained gas bubbles with the piston. Another embodiment uses three, three way valves which are coupled to a pump and a means to compress the sample. The valves are operated to suck a portion of sample up into the tubes connecting the valves, isolate the sample from the sample container, compress the sample using the compressed gas and trap a known volume of the compressed sample in the tube between valves. The trapped sample is then flushed out of the system with diluent to prepare the sample for analysis.
REFERENCES:
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patent: 3638498 (1972-02-01), Nelms
patent: 3981179 (1976-09-01), Roof
patent: 4002053 (1977-01-01), Hayakawa
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patent: 4433587 (1984-02-01), Risdal
patent: 4441374 (1984-04-01), Suzuki
patent: 4445391 (1984-05-01), Cabrera
Altermatt et al., (1986) "Messen Von Stoffspezifeschen Groben In Der Chemischen Produktion-Erfahrungen, Trends."
Metzger Andre
Nau Vance J.
Nohl Andre J.
Davis Paul
Fish Ron
Levy Stewart J.
Raevis Robert R.
Spectra Physics
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