Electromagnetic flowmeter
US9683878B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2016 |
| Grant date | Jun 20, 2017 |
| Priority date | — |
| Expiry date | Mar 4, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/60
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electromagnetic flowmeter applies a magnetic field, which is generated by excitation current, to a fluid to be measured flowing in a measurement tube, and measures a flow rate of the fluid to be measured on the basis of a detection signal to be generated from an electrode provided in the measurement tube. The electromagnetic flowmeter includes an excitation circuit configured to generate the excitation current having a positive excitation period, a negative excitation period and a non-excitation period, and a diagnosis unit configured to detect an abnormality based on characteristics of the fluid to be measured, on the basis of a level of the detection signal in a non-excitation stable period, which is a period in which a differential noise of detection signal to be generated in the non-excitation period converges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.