EP 1819988 A2 20070822 - METHOD FOR DETERMINING THE MASS FLOW THROUGH A CORIOLIS MASS FLOWMETER
Title (en)
METHOD FOR DETERMINING THE MASS FLOW THROUGH A CORIOLIS MASS FLOWMETER
Title (de)
VERFAHREN ZUR BESTIMMUNG DES MASSEDURCHFLUSSES EINES CORIOLIS-MASSEDURCHFLUSSMESSERS
Title (fr)
PROCEDE POUR DETERMINER LE DEBIT MASSIQUE D'UN DEBITMETRE MASSIQUE CORIOLIS
Publication
Application
Priority
- EP 2005056104 W 20051121
- DE 102004056370 A 20041122
Abstract (en)
[origin: WO2006056560A2] The invention relates to a method for determining the mass flow through a Coriolis mass flowmeter, wherein a meter tube is induced to oscillate with the frequency f and the resulting oscillation is detected in two different measuring sites using two oscillation sensors. The analog sensor signals X17, X18 of the two oscillation sensors are converted to digital sensor signals S1 and S2 and are processed in a digital signal processor DSP. In the digital signal processor DSP, the two sensor signals S1 and S2 are used to produce the sum signal S and the differential signal ?. The sum signal is then rotated by 90º. In another process step, the rotated sum signal is multiplied by the differential signal ?. Once the amplitude of the sum signal S is determined, the mass flow is determined using the formula <maths><img></img></maths> ~|Im(?)|/ ( |S| f ). The inventive method does not require that the two sensor signals S1, S2 have the same amplitudes. It is therefore not necessary to adjust the analog signals X17, X18 to the same amplitude.
IPC 8 full level
G01F 1/84 (2006.01)
CPC (source: EP US)
G01F 1/8413 (2013.01 - EP US); G01F 1/8431 (2013.01 - EP US); G01F 1/849 (2013.01 - EP US)
Citation (search report)
See references of WO 2006056560A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
DE 102004056370 A1 20060524; EP 1819988 A2 20070822; US 2009211373 A1 20090827; US 7854176 B2 20101221; WO 2006056560 A2 20060601; WO 2006056560 A3 20061221
DOCDB simple family (application)
DE 102004056370 A 20041122; EP 05811169 A 20051121; EP 2005056104 W 20051121; US 79128105 A 20051121