Title:
THERMAL GAS FLOWMETER COMPRISING A GAS QUALITY INDICATOR
Document Type and Number:
WIPO Patent Application WO2004018976
Kind Code:
A3
Abstract:
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 (lambda, alpha, c, eta) 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.
Inventors:
MATTER DANIEL (CH)
LUCHSINGER ROLF (CH)
KRAMER BEAT (CH)
SABBATTINI BRUNO (CH)
LUCHSINGER ROLF (CH)
KRAMER BEAT (CH)
SABBATTINI BRUNO (CH)
Application Number:
PCT/CH2003/000492
Publication Date:
April 22, 2004
Filing Date:
July 22, 2003
Export Citation:
Assignee:
ABB RESEARCH LTD (CH)
MATTER DANIEL (CH)
LUCHSINGER ROLF (CH)
KRAMER BEAT (CH)
SABBATTINI BRUNO (CH)
MATTER DANIEL (CH)
LUCHSINGER ROLF (CH)
KRAMER BEAT (CH)
SABBATTINI BRUNO (CH)
International Classes:
G01F1/696; G01F15/04; G01F25/00; G01N33/22; (IPC1-7): G01F15/04; G01F15/00; G01K17/06; G01F1/68; G01F25/00
Domestic Patent References:
| WO2001018500A1 | 2001-03-15 |
Foreign References:
| EP1164361A1 | 2001-12-19 | |||
| FR2776776A1 | 1999-10-01 | |||
| US4345463A | 1982-08-24 | |||
| EP0468793A2 | 1992-01-29 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 09 30 July 1999 (1999-07-30)
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