发明名称 |
MAGNETIC FLOWMETER WITH DRIVE SIGNAL DIAGNOSTICS |
摘要 |
A magnetic flowmeter includes a flowtube arranged to receive a flow of process fluid. A coil is positioned proximate the flowtube and arranged to apply a magnetic field to the process fluid in response to a drive current alternating direction. First and second electrodes are arranged to sense a voltage potential in the process fluid in response to the applied magnetic field. The voltage potential is indicative of flow rate of process fluid through the flowtube. A sensor is coupled to the first and second current paths which has a sensor output related to the drive current. Diagnostic circuitry provides a diagnostic output as a function of a transient change in the sensor output when current flowing through the coil alternates direction. |
申请公布号 |
US2015082909(A1) |
申请公布日期 |
2015.03.26 |
申请号 |
US201314038065 |
申请日期 |
2013.09.26 |
申请人 |
Rosemount Inc. |
发明人 |
Foss Scot Ronald;Dreier Jared James |
分类号 |
G01F1/58;G01R31/02 |
主分类号 |
G01F1/58 |
代理机构 |
|
代理人 |
|
主权项 |
1. A magnetic flowmeter, comprising:
a flowtube arranged to receive a flow of process fluid; a coil proximate the flowtube arranged to apply a magnetic field to the process fluid in response to an alternating coil drive current; first and second electrodes arranged to sense a voltage potential in the flowtube in response to the applied magnetic field, the voltage potential indicative of flow rate of process fluid through the flowtube; and a sensor coupled to the coil having a sensor output related to the drive current; and diagnostic circuitry having a diagnostic output as a function of a transient change in the sensor output when current flowing through the coil alternates direction. |
地址 |
Chanhassen MN US |