Electromagnetic flow meter, miswiring detection apparatus and miswiring detection method

摘要

An electromagnetic flow meter includes a converter including an excitation unit configured to generate and output an excitation signal and a flow rate signal receiving unit configured receive a flow rate signal, a flowtube including a coil connected to the excitation unit through an excitation cable and an electrode connected to the flow rate signal receiving unit through a signal cable, and a miswiring detection unit configured to enable the excitation unit to output an excitation signal of a first frequency and to calculate a first index value relating to the first frequency and a second index value relating to a second frequency from a flow rate signal acquired when the excitation signal of the first frequency is output. The miswiring detection unit determines that a miswiring occurs when the first index value is not large enough to satisfy a predetermined criterion than the second index value.

主权项

1. An electromagnetic flow meter comprising:
a converter comprising an excitation unit configured to generate and output an excitation signal and a flow rate signal receiving unit configured receive a flow rate signal; a flowtube comprising a coil connected to the excitation unit through an excitation cable and an electrode connected to the flow rate signal receiving unit through a signal cable; and a miswiring detection unit configured to enable the excitation unit to output an excitation signal of a first frequency and configured to calculate a first index value relating to the first frequency and a second index value relating to a second frequency from a flow rate signal, which is acquired when the excitation signal of the first frequency is output, wherein the miswiring detection unit determines that a miswiring occurs when the first index value is not large enough to satisfy a predetermined criterion than the second index value.