Atmospheric sampling system

Details Atmospheric sampling system Atmospheric sampling system

1981-07-15

1983-06-21

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

340632, G01N 2718

Patent

active

043888224

ABSTRACT:
A three-wire digital atmospheric sampling system, particularly adapted to detect methane in mines, wherein accuracy is increased by ratiometric analog-to-digital conversion synchronized by a microprocessor. A reset signal, and read-out pulses indicative of the atmospheric condition, are transmitted along the same signal wire as are digital ratiometric signals, thus enabling the use of three conductors only between an atmospheric sampling probe, a microprocessor, and a visual read-out console.

REFERENCES:
patent: 3950739 (1976-04-01), Campman
patent: 4073194 (1978-02-01), Willson et al.
patent: 4314475 (1982-02-01), Karpov et al.

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