METHOD DETERMINING CONCENTRATION OF COMBUSTIBLE GASES IN OXYGEN-CARRYING ATMOSPHERE Russian patent published in 1999 - IPC

FIELD: analysis of gaseous atmosphere. SUBSTANCE: thermal catalytic element is placed into measurement camber and pulses of electric current are fed to it. Resistance Rτ_0-1 of thermal catalytic element at time moment in interval from τ₀ to τ₁ is measured in advance, where τ₀ is time moment from start of feed of pulse of electric current, τ₁ is time moment to start of oxidation reaction of combustible gases on surface of thermal catalytic element. Value of resistance Rτ_1-2 of thermal catalytic element at time moment in interval from τ₁ to τ₂ is measured, where τ₂ is time moment to start of formation of heated gas boundary layer around thermal catalytic element at which feed of pulse of electric current is stopped. Constant coefficient K=K = Rτ_1-2/Rτ_0-1. is found. After it present value of resistance Rτ₁ of thermal catalytic element at time moment τ₁ and present value of resistance Rτ₂ of thermal catalytic element at time moment τ₂, are measured and value of resistance R⁰τ₂ = KRτ₁ of thermal catalytic element at time moment τ₂ is determined with zero presence of combustible gases in oxygen-carrying atmosphere and later ΔRτ₂ = Rτ₂-R⁰τ₂ is found. Value ΔRτ₂ is used to evaluate value of concentration of combustible gases in oxygen-carrying atmosphere. EFFECT: provision for determination of integral explosion hazard of multicomponent gaseous atmosphere containing components noticeably differing by molecular mass, prolonged service life of thermal catalytic element and reduced energy consumption. 3 dwg