| 摘要 |
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.
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