combustible gas / measure hydrocarbon gas / detection systems / gas present / low toxic gas detection limits / refrigerant gas leaks / catalytic bead technology / chemical plants / chemical poison-resistant / fixed gas detection systems / gas leak / metal mining / micro-processor / Paper tape technology / e-chem / Gas reading display / Metal oxide / toxic and combustible gas monitoring / gas clouds / overall hazardous gas detection coverage / combustible gas detection / early warning systems / gas concentration / Ultrasonic gas leak detectors / machinery / chemical agent presence / manufacturing facilities / gas detection devices / sensor technology / chemical concentrations / Gas detection technologies / detection technologies / gas dispersal / water treatment by-products / gas detection systems / Gas reading / toxic gas sensors / gas detection terminology / gas exposure / furnace/gas pipeline leaks / openpath systems / Metal oxide semiconductor sensors / chemical vapor mass / gas sample / pressure systems / gas characteristic / transportation routes / line-of-sight optical technology / gas detection requirements / gas plumes / gas detection system / carbide-based photo detection technology / fixed-site gas detection system / toxic gas / present gas concentration / binary gas streams / hazardous gas safety monitoring / machinery exhaust / hazardous gas concentrations / fixed-site gas detection systems / Gas sample exposure / outdoor gas detection systems / gas detectors / gas detection equipment / Gas readings display / pressurized gas escapes / reference gas / gas sensor / chemical analysis / automatic ventilation systems / target gas / gas cloud / inert reference gas / /