Abb Research Ltd.

Ems-patent Ag

Philippe Prétre

Daniel A Matter

Thomas Kleiner

Rolf Luchsinger

Bruno Sabbattini

Described is a method and a device for more accurate measurement of a gas supply with a gas meter. A consumption-weighted correction factor is determined by weight averaging of a sensor error factor of the gas meter with a consumption profile characteristic of the gas supply location and the measuring signal is converted using the correction factor. Embodiments relate inter alia to: operation of the gas meter as volume, mass or energy meter; formulae for determining the correction factor with sensor error factors and consumption profiles relative to volume, mass or energy; and measuring signal correction in the case of a non-registering or registering gas meter. Advantages are inter alia: subsequent customer-specific measuring signal correction; no additional measuring complexity; and improved measuring accuracy, in particular improved energy measurement by means of compensation for inherent deviations of the energy signal in the vase of heat value variations.

Increased accuracy gas energy meter

The invention relates to a process and a device for thermal measuring the flow rate (v) of a fluid (). In conventional thermal sensors the heating power P is supplied in the form of rectangular pulses. According to the invention, the sensor means () are supplied by a heating control () with non-constant heating pulses having a sublinear build-up dynamics P(t). Thereby, a nonlinear behaviour of the threshold value time (t), until a threshold value temperature (T) is reached, as a function of the flow rate (v) can at least partially be compensated. Embodiments concern inter alia a build-up dynamics P(t) proportional to tand/or to a time-independent amplitude factor (1+R/R), wherein m is a Reynolds-number-dependent exponent and R, Rare thermal transfer resistances. The advantages are an improved precision, a shorter measuring time and an enlarged measuring range for the flow rate v.

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Baden-Dättwil, Switzerland

Philippe Prétre