Patent ID: 8249752

Claim:
A flow rate measuring system, comprising: a plurality of electromagnetic flow meters provided with synchronization signal generators generating synchronization signals at a predetermined frequency, wherein one of the plurality of electromagnetic flow meters is defined as a master electromagnetic flow meter and another electromagnetic flow meter is defined as a slave electromagnetic flow meter, wherein, the synchronization signal generated by the synchronization signal generator of the master electric magnetic flow meter is defined as a master synchronization signal, wherein flow rate measurement is performed by generating a magnetic field with magnetic excitation timing synchronized to the master synchronization signal, and, in the slave electromagnetic flow meter, a magnetic field is generated with a magnetic excitation timing synchronized to the master synchronization signal that is sent either directly or indirectly from the master electromagnetic flow meter to perform the flow rate measurement; wherein the slave electromagnetic flow meter comprises: a synchronization signal monitor monitoring the master synchronization signal from the master electromagnetic flow meter and switching the synchronization signal that is used in the flow rate measurement to a synchronization signal that is generated by the synchronization signal generator of the slave electromagnetic flow meter, and defining the switched synchronization signal as a second master synchronization signal for a slave electromagnetic flow meter of a next stage, when the master synchronization signal from the master electromagnetic flow meter is interrupted.