Method for operating a magnetic-inductive flowmeter with improved compensation of the interfering voltage
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01F-001/58
G01F-001/60
출원번호
US-0647909
(2014-09-25)
등록번호
US-9599494
(2017-03-21)
우선권정보
DE-10 2013 015 899 (2013-09-25)
국제출원번호
PCT/EP2014/002599
(2014-09-25)
국제공개번호
WO2015/043746
(2015-04-02)
발명자
/ 주소
Bilgic, Attila
Brockhaus, Helmut
Neven, Josef
Spiegel, Christoph
출원인 / 주소
KROHNE Messtechnik GmbH
대리인 / 주소
Safran, David S.
인용정보
피인용 횟수 :
0인용 특허 :
6
초록▼
Method for operating for measuring the flow velocity of a flowing medium using a measuring device in which a magnetic field is induced in the flowing medium and on which a interference voltage is superimposed. During compensation measuring, a first magnetic flux density is generated in the medium an
Method for operating for measuring the flow velocity of a flowing medium using a measuring device in which a magnetic field is induced in the flowing medium and on which a interference voltage is superimposed. During compensation measuring, a first magnetic flux density is generated in the medium and a first measuring voltage determined, a second magnetic flux density is generated in the medium and a second measured voltage determined, and a third magnetic flux density is generated in the medium and a third measured voltage determined. The flow velocity is determined from the first and second magnetic flux densities and measured voltages, and the interference voltage is determined form the third magnetic flux density and measured voltage and the determined flow velocity. Then, a fourth measured voltage is determined, and the flow velocity re-determined from the third magnetic flux density, the fourth measured voltage and the determined interference voltage.
대표청구항▼
1. Method for operating a magnetic-inductive flowmeter for measuring the flow velocity of a flowing medium, having a magnetic field generator with an electric magnet arrangement and a permanent magnet arrangement for generating a magnetic field with varyingly large magnetic flux densities in the flo
1. Method for operating a magnetic-inductive flowmeter for measuring the flow velocity of a flowing medium, having a magnetic field generator with an electric magnet arrangement and a permanent magnet arrangement for generating a magnetic field with varyingly large magnetic flux densities in the flowing medium, andhaving a measuring device including a measuring electrode arrangement for measuring the measuring voltage induced by the magnetic field in the flowing medium and superimposed by an interfering voltage,wherein a measuring cycle comprising a compensation measurement sequence and a work measurement event is carried out,wherein at least one first measurement event, at least one second measurement event and at least one third measurement event are carried out during the compensation measurement sequence,wherein a first magnetic flux density is generated in the medium and a first measuring voltage is determined during the first measurement event,wherein a second magnetic flux density is generated in the medium and a second measuring voltage is determined during the second measurement event,wherein a third magnetic flux density is generated in the medium and a third measuring voltage is determined during the third measurement event,wherein the flow velocity is determined using the first magnetic flux density, the second magnetic flux density, the first measuring voltage and the second measuring voltage,wherein the interfering voltage is determined using the third magnetic flux density, the third measuring voltage and the determined flow velocity,wherein the work measurement event is carried out after the compensation measurement sequence and the work measurement event comprising at least one fourth measurement event,wherein the third magnetic flux density is generated in the medium and a fourth measuring voltage is determined during the fourth measurement event, andwherein the flow velocity is determined anew using the third magnetic flux density, the fourth measuring voltage and the determined interfering voltage. 2. Method according to claim 1, wherein a magnetic remanence of the permanent magnet arrangement is not changed by the magnetic field generated by the electric magnet arrangement. 3. Method according to claim 1, wherein at least two measurements of the measuring voltage are carried out for determining the measuring voltage. 4. Method according to claim 1, wherein the first measurement events and the second measurement events of the compensation measurement sequences are alternately carried out. 5. Method according to claim 1, wherein the electric magnet arrangement is applied with a first current during the first measurement event and with a second current during the second measurement event and wherein an absolute value of the first current is identical to an absolute value of the second current and algebraic signs of the first current and the second current are opposites. 6. Method according to claim 1, wherein the third magnetic flux density is generated solely by the permanent magnet arrangement. 7. Method according to claim 1, wherein a change in flow velocity over time is determined using two successive flow velocities of the medium, the change in flow velocity over time is compared to a typical change in interfering voltage over time and, if the change in flow velocity over time is greater than the typical change in interfering voltage over time, a new measuring cycle is started. 8. Method according to claim 1, wherein a future course of the interfering voltage between the individual compensation measurement sequences is estimated, and the estimated future course of the interfering voltage is used for calculating the flow velocity. 9. Method according to claim 1, wherein, additionally, a predicative estimation of a future course of the interfering voltage is used for calculating the flow velocity. 10. Method according to claim 1, wherein a predicative, estimated course of the interfering voltage is additionally verified during an ensuing compensation measurement and, in the case that a maximum tolerable deviation is exceeded, past measured values are retroactively corrected.
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이 특허에 인용된 특허 (6)
Hafner Peter,CHX ; Schafer Robert,CHX ; Unterseh Roland,FRX, Galvanic electrode of an electromagnetic flow meter.
Bonfig Karl Walter (Bochum-Stiepel DT) Hofmann Friedrich (Duisburg-Grossenbaum DT) Stelz Wolfgang (Oberhausen DT) VAN DER Pol Ronald (Venlo NL), Method for compensation of the electrochemical perturbing direct current potential in inductive flow measurement with a.
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