ELECTROMAGNETIC FLOWMETER AND INSULATION DETERIORATION DIAGNOSTIC METHOD OF EXCITING COIL IN ELECTROMAGNETIC FLOWMETER

摘要

PROBLEM TO BE SOLVED: To provide an electromagnetic flowmeter in which insulation deterioration of an exciting coil can be diagnosed using a circuit for flow measurement.;SOLUTION: The electromagnetic flowmeter measures flow rate of a liquid to be measured by applying exciting current with a predetermined waveform to an exciting coil, and obtains a flow rate signal which is based on electromotive force of the liquid to be measured flowing in a measurement pipe. The electromagnetic flowmeter includes: a detection resistance for detecting the exciting current; an exciting part for controlling pulse width in on-time based on a detection result of the exciting current and generating the exciting current with the predetermined waveform by switching operation in which the minimum value of the pulse width is provided; and a diagnostic part for diagnosing insulation deterioration of the exciting coil based on the detected exciting current value.;COPYRIGHT: (C)2015,JPO&INPIT