Sample presence detector for automatic sample injector

Details Sample presence detector for automatic sample injector Sample presence detector for automatic sample injector

1987-09-18

1990-05-22

Noland, Tom

Measuring and testing

Sampler, sample handling, etc.

Analyzer supplier

7386373, 7386301, G01N 114

Patent

active

049267027

ABSTRACT:
A detector for detecting the presence of an electrically conductive sample solution in a sample injection metering valve by electrical sensing the leading edge of the sample solution, wherein the amount of sample solution in excess of the metered amount required to cause detection is minimized. A conductive probe is positioned on the valve body just downstream of the sample metering passage of the valve, the probe being electrically insulated from the valve body. The probe and valve body form electrodes which will detect the arrival of the leading edge of a conductive sample solution which completes a conductive circuit between the electrodes.

REFERENCES:
patent: 3504799 (1970-04-01), Ogle
patent: 4059009 (1977-11-01), Ball et al.
patent: 4444066 (1984-04-01), Ogle et al.

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