Thermal gas flowmeter comprising a gas quality indicator

Details Thermal gas flowmeter comprising a gas quality indicator Thermal gas flowmeter comprising a gas quality indicator

2008-07-15

2008-07-15

Verbitsky, Gail (Department: 2855)

Thermal measuring and testing

Calorimetry

Heat value of combustion

C374S031000, C374S032000, C374S043000, C073S025010, C073S204110, C073S025050, C073S204190, C073S023310

Reexamination Certificate

active

10524948

ABSTRACT:
The invention relates to a method and a device for measuring a gas consumption by means of a gas meter. A gas meter with thermal mass flow sensor for determining mass flow signals (SM) and with a calibration as energy meter for outputting energy value signals (SE) is known. According to the invention, a gas type is determined by the gas meter insofar as combustible and non-combustible gas mixtures are differentiated. The gas meter is operated, in the case of a non-combustible gas mixture, with calibration in mass or standard volume units (I/min) and, in the case of a combustible gas mixture, with calibration in energy units (kWh). Embodiments concern inter alia: measurement of a gas parameter (λ, α, c, η) of the gas or determining the gas type; gas quality sensor with an identical construction to thermal flow sensor; measuring intervals lengthened in the case of non-combustible gas and shortened in the case of combustible gas. Advantages are inter alia: reliable energy measurement because of automatic differentiation between non-meterable gas and high-quality useful gas; detection of manipulation attempts; and automatic heat value tracking even without heat value measurement.

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