Patent ID: 8433527

Claim:
An electromagnetic flow meter that applies magnetic fields with a first frequency and a second frequency lower than the first frequency, to a fluid to be measured, calculates a first flow rate on the basis of a signal generated by a first magnetic field with the first frequency, calculates a second flow rate on the basis of a signal generated by a second magnetic field with the second frequency, performs low-pass filtering on the first flow rate to calculate a first low-pass filtered flow rate, and performs low-pass filtering on the second flow rate to calculate a second low-pass filtered flow rate, the electromagnetic flow meter comprising: an abnormality detecting unit that detects an abnormal state in which, the fluid to be measured is at non-full level on the basis of at least one of the first flow rate and the second flow rate; and an abnormality removing unit that removes an indication of the abnormal state on the basis of the first low-pass filtered flow rate and the second low-pass filtered flow rate, when the abnormality detecting unit does not determine that the fluid to be measured is in the abnormal state.