Flowmeter, insulation deterioration diagnosis system, and insulation deterioration diagnosis method

Patent metadata

Field	Value
Publication number	US-9726526-B2
Application number	US-201514753104-A
Country	US
Kind code	B2
Filing date	Jun 29, 2015
Priority date	Jul 11, 2014
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

A flowmeter includes an exciter configured to excite fluid which is a measurement target, a state detector configured to detect a state of the fluid excited by the exciter, a driver configured to supply exciting current for driving the exciter, a first current detector that is disposed between the exciter and the driver, the first current detector being configured to detect the exciting current, and a processor configured to diagnose insulation deterioration of the exciter in accordance with a change of a detection result of the first current detector.

First claim

What is claimed is:

1. A flowmeter comprising:
an exciter configured to excite fluid which is a measurement target;
a state detector configured to detect a state of the fluid excited by the exciter;
a driver configured to supply exciting current for driving the exciter, the exciting current being an alternating current;
a first current detector that is disposed between the exciter and the driver, the first current detector being configured to detect the exciting current; and
a processor configured to diagnose insulation deterioration of the exciter in accordance with a change of a detection result of the first current detector when the exciting current is supplied from the driver to the exciter.

2. The flowmeter according to claim 1 , wherein
the processor is configured to measure flow quantity of the fluid by using a detection result of the state detector, and
the processor is configured to correct the flow quantity of the fluid by using the detection result of the first current detector.

3. The flowmeter according to claim 1 , wherein
the processor stores, as a reference exciting current, an exciting current which is supplied to the exciter when the insulation deterioration of the exciter does not occur, and
in a case that a difference between the detection result of the first current detector and the reference exciting current exceeds a predetermined threshold, the processor is configured to diagnose that the insulation deterioration of the exciter occurs.

4. The flowmeter according to claim 1 , wherein
the exciter comprises an exciting coil which excites the fluid, and
the state detector comprises detecting electrodes which detect electromotive force generated by the fluid excited by the exciting coil.

5. The flowmeter according to claim 4 , wherein
the driver is configured to supply the alternating current to the exciting coil in a positive direction and a negative direction alternately, and
in both cases of supplying the alternating current in the positive direction and supplying the alternating current in the negative direction, the processor is configured to diagnose the insulation deterioration.

6. A flowmeter comprising:
an exciter configured to excite fluid which is a measurement target;
a state detector configured to detect a state of the fluid excited by the exciter;
a driver configured to supply exciting current for driving the exciter;
a first current detector that is disposed between the exciter and the driver, the first current detector being configured to detect the exciting current; and
a processor configured to diagnose insulation deterioration of the exciter in accordance with a change of a detection result of the first current detector,
wherein the driver comprises:
a second current detector configured to detect the exciting current; and
a current controller configured to control a magnitude of the exciting current in accordance with a detection result of the second current detector, and

wherein, in a case that a difference between the detection result of the first current detector and the detection result of the second current detector exceeds a predetermined threshold, the processor is configured to diagnose that the insulation deterioration of the exciter occurs.

7. A flowmeter comprising:
an exciter configured to excite fluid which is a measurement target;
a state detector configured to detect a state of the fluid excited by the exciter;
a driver configured to supply exciting current for driving the exciter;
a first current detector that is disposed between the exciter and the driver, the first current detector being configured to detect the exciting current;
a processor configured to diagnose insulation deterioration of the exciter in accordance with a change of a detection result of the first current detector; and
a reference electrode configured to prescribe a reference electrical potential of the electromotive force,
wherein the exciter comprises an exciting coil which excites the fluid,
wherein the state detector comprises detecting electrodes which detect electromotive force generated by the fluid excited by the exciting coil, and
wherein electrical potential of a connecting point between the driver and the first current detector is the same as electrical potential of the reference electrode.

8. An insulation deterioration diagnosis system comprising:
a flowmeter that comprises:
an exciter configured to excite fluid which is a measurement target;
a state detector configured to detect a state of the fluid excited by the exciter;
a processor configured to measure flow quantity of the fluid by using a detection result of the state detector;
a driver configured to supply exciting current for driving the exciter, the exciting current being an alternating current;
a first current detector that is disposed between the exciter and the driver, the first current detector being configured to detect the exciting current; and
an interface configured to output a detection result of the first current detector to outside of the flowmeter; and

a diagnoser configured to diagnose insulation deterioration of the exciter in accordance with a change of the detection result of the first current detector output from the flowmeter when the exciting current is supplied from the driver to the exciter.

9. The insulation deterioration diagnosis system according to claim 8 , wherein
the processor is configured to measure flow quantity of the fluid by using a detection result of the state detector, and
the processor is configured to correct the flow quantity of the fluid by using the detection result of the first current detector.

10. The insulation deterioration diagnosis system according to claim 8 , wherein
the diagnoser stores, as a reference exciting current, an exciting current which is supplied to the exciter when the insulation deterioration of the exciter does not occur, and
in a case that a difference between the detection result of the first current detector and the reference exciting current exceeds a predetermined threshold, the diagnoser is configured to diagnose that the insulation deterioration of the exciter occurs.

11. The insulation deterioration diagnosis system according to claim 8 , wherein
the exciter comprises an exciting coil which excites the fluid, and
the state detector comprises detecting electrodes which detect electromotive force generated by the fluid excited by the exciting coil.

12. The insulation deterioration diagnosis system according to claim 11 , wherein
the driver is configured to supply the alternating current to the exciting coil in a positive direction and a negative direction alternately, and
in both cases of supplying the alternating current in the positive direction and supplying the alternating current in the negative direction, the diagnoser is configured to diagnose the insulation deterioration.

13. An insulation deterioration diagnosis system comprising:
a flowmeter that comprises:
an exciter configured to excite fluid which is a measurement target;
a state detector configured to detect a state of the fluid excited by the exciter;
a processor configured to measure flow quantity of the fluid by using a detection result of the state detector;
a driver configured to supply exciting current for driving the exciter;
a first current detector that is disposed between the exciter and the driver, the first current detector being configured to detect the exciting current; and
an interface configured to output a detection result of the first current detector to outside of the flowmeter; and

a diagnoser configured to diagnose insul

Assignees

• Yokogawa Electric Corp

Inventors

• Shimura Toru

Classifications

• G01F1/588

  combined constructions of electrodes, coils or magnetic circuits, accessories therefor · CPC title

• G01F1/586

  constructions of coils, magnetic circuits, accessories therefor (G01F1/582 takes precedence; magnet; inductances; transformers; selection of materials for their magnetic properties per se H01F) · CPC title

• G01F1/584

  constructions of electrodes, accessories therefor · CPC title

• G01F25/0007

  Physics · mapped topic

• G01F1/58

  by electromagnetic flowmeters · CPC title