THERMAL GAS FLOWMETER COMPRISING A GAS QUALITY INDICATOR

摘要

The invention relates to a method and a device for measuring gas consumption by means of a gas meter (1). A gas meter (1) comprising a thermal flow sensor (1a) for determining mass flow signals (SM) and a calibrating device used as an energy measuring appliance for emitting energy value signals (SE) is known. According to the invention, a gas type is determined by the gas meter (1) insofar as combustible and non-combustible gas mixtures (3) are differentiated. For a non-combustible gas mixture (3), the gas meter (1) is operated with calibration in mass units or units of volume under standard conditions (1/min), and for a combustible gas mixture (3), with calibration in energy units (kWh). Forms of embodiment include, inter alia, the measurement of a parameter (<, ?, c, ?) of the gas (3) in order to determine the gas type; a gas quality sensor (1a) with the same structure as the thermal flow sensor (1a); and longer measuring intervals for a non-combustible gas (3) and shorter measuring intervals for a combustible gas (3). The advantages of the invention are, inter alia, reliable energy measurement as a result of the automatic differentiation between a non-accountable gas (3) and a high-quality useful gas (3); recognition of manipulation attempts; and automatic calorific value tracking even without calorific value measurement.