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AERIUS G4 gas meter: gas consumption measurement using microthermal flow sensors

Now that electronic measuring techniques are established practice in heat, water and electricity measurement, static measuring techniques without moving mechanical parts - and thus wear-free - will also become increasingly important in detecting gas consumption in the future. This is supported by essentially two reasons. First the use of electronic measuring methods permits accurate detection of consumption and second the integration of the system into a network for automatic consumption detection (catchword Smart Metering) is desirable. Diehl Gas Metering GmbH concentrates gas expertise in the Diehl Metering division and is developing a static gas meter based on a microthermal measuring principle. This microthermal measuring method enables direct detection of standard volume, i.e. air pressure, altitude zones and temperature differences do not influence the measuring accuracy. This permits simple and transparent billing for the benefit of utilities and consumers. The list of advantages is rounded off by compact housing dimensions, no disturbing noise during operation and electronic transmission of consumption values including key operating states, such as high operating temperatures, which could indicate a fire.

In addition to electronic heat and water meters, the Diehl Metering division is developing the AERIUS G4 electronic gas meter. For this purpose, Diehl Gas Metering GmbH, which concentrates the gas metering expertise in the division, is using a microthermal method with the aid of a CMOS semiconductor chip, which sends a direct electrical signal for further processing and transmission. The measuring principle is based on the measurement of the temperature change caused by a gas flow on a heated membrane with a thickness of a few micrometres. As this thermal measuring principle is not only dependent on the gas fl ow, but also on the type of gas itself, an additional measurement mode has been incorporated in AERIUS to correct the sensor output signal for the type of gas. With this measurement mode, AERIUS is suitable for type H natural gases and conditioned biogases (with H gas) as per German DVGW Worksheet G260. This measurement mode can also be used to indicate manipulation. The development and production of the AERIUS meter and the use of a microthermal fl ow sensor creates the basis for a broad product spectrum in the near future. AERIUS will go into production as a G4 meter with a single-pipe connector at the end of 2011, and a meter with dual-pipe connectors will follow. AERIUS will initially be equipped with unidirectional interfaces for integration into an AMR network. A future development of AERIUS will be equipped with bidirectional radio interfaces for integrating the meter into an AMI (Automated Metering Infrastructure) or Smart Grid Network. This will enable additional information to be transmitted about the type of gas, such as the calorifi c value or tariff data. AERIUS will then become an energy meter, which like the introduction of the microthermal flow measurement is a novelty in the field of gas consumption.

Copyright:	© DIV Deutscher Industrieverlag GmbH
Quelle:	GWF international 2 2011 (Oktober 2011)
Seiten:	4
Preis:	€ 4,00
Autor:	Dr.-Ing. Christoph Sosna Dipl.-Phys. Ing. Manfred Schulze
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