최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | UP-0863566 (2007-09-28) |
등록번호 | US-7750642 (2010-07-26) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 2 인용 특허 : 335 |
A magnetic flowmeter is provided including a magnetic flowtube arranged to receive a flow of process fluid. The magnetic flowtube includes a drive coil and at least one sense electrode. Measurement circuitry is coupled to the flowtube and is configured to provide a drive signal to the drive coil and
A magnetic flowmeter is provided including a magnetic flowtube arranged to receive a flow of process fluid. The magnetic flowtube includes a drive coil and at least one sense electrode. Measurement circuitry is coupled to the flowtube and is configured to provide a drive signal to the drive coil and measure flow of process fluid through the flow tube based upon an output from the sense electrode. A memory contains a stored value related to a nominal parameter of the flowtube. Verification circuitry is arranged to measure a parameter of the magnetic flowtube and responsively provide a verification output related to operation of the magnetic flowmeter based upon a comparison of the measured parameter and the stored value.
What is claimed is: 1. A magnetic flowmeter, comprising: a magnetic flowtube arranged to receive a flow of process fluid, the magnetic flowtube including a drive coil and at least one sense electrode; measurement circuitry coupled to the flowtube configured to provide a drive signal to the drive co
What is claimed is: 1. A magnetic flowmeter, comprising: a magnetic flowtube arranged to receive a flow of process fluid, the magnetic flowtube including a drive coil and at least one sense electrode; measurement circuitry coupled to the flowtube configured to provide a drive signal to the drive coil and measure flow of process fluid through the flow tube based upon an output from the at least one sense electrode; a non-volatile memory configured to contain a plurality of stored values related to nominal parameters of the flowtube placed in the memory during manufacture of the flowmeter; and verification circuitry arranged to measure a plurality of parameters of the magnetic flowtube and responsively provide a verification output related to operation of the magnetic flowmeter based upon a comparison of the plurality of measured parameters and the plurality of stored values. 2. The apparatus of claim 1 wherein the measurement circuitry is configured to measure flow during operation of the verification circuitry. 3. The apparatus of claim 1 wherein the verification circuitry is configured to measure resistance of a coil of the flowtube. 4. The apparatus of claim 1 wherein the verification circuitry is configured to measure inductance of a coil of the flowtube. 5. The apparatus of claim 1 wherein the verification circuitry is configured to measure resistance of electrodes of the flowtube to process ground. 6. The apparatus of claim 1 wherein the verification circuitry is further configured to measure an output placed on a two-wire process control loop. 7. The apparatus of claim 1 wherein the verification circuitry is configured to measure a current level of current of the drive signal applied to the drive coil by the measurement circuitry. 8. The apparatus of claim 1 wherein the nominal parameter values are stored in the memory by the verification circuitry. 9. The apparatus of claim 1 wherein the nominal parameter values are selected from the group of values consisting of pulse output, digital inputs and digital outputs. 10. A method for verifying operation of a magnetic flowmeter, comprising: electrically coupling to a magnetic flowtube arranged to receive a flow of process fluid, the flowtube coupled to a flow of process fluid, the magnetic flowtube including a drive coil and at least one sense electrode; storing a plurality of nominal parameter values in a non-volatile memory during manufacture of the flowmeter; measuring a plurality of parameters of the magnetic flowtube; retrieving the stored nominal parameter values from non-volatile memory of the flowtube; and providing a verification output based upon a comparison of the measured parameters of the magnetic flowtube and the stored nominal parameter values. 11. The method of claim 10 wherein measuring parameters comprises measuring resistance of a coil of the flowtube. 12. The method of claim 10 wherein measuring parameters comprises measuring inductance of a coil of the flowtube. 13. The method of claim 10 wherein measuring parameters comprises measuring resistance of electrodes of the flowtube. 14. The method of claim 10 wherein measuring parameters comprises further measuring an output placed on a two-wire process control loop. 15. The method of claim 10 including measuring a current level of current of the drive signal applied to the drive coil by the measurement circuitry.
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