VERFAHREN ZUM MESSEN VON KENNGROESSEN DER UMGEBUNGSATMOSPHAERE, INSBESONDERE VON KONZENTRATIONEN EXPLOSIONSGEFAEHRLICHER GASE IM WETTERSTROM UNTER TAGE

摘要

Explosive gas concentrations in a subterranean atmosphere can be monitored, not by measuring the concentration of the explosive gas directly but, according to the invention, by monitoring a second parameter of the atmosphere, e.g. oxygen concentration, and calculating the level of the combustible gas from this measured value.