This International Standard describes the principle and main design features of industrial electromagnetic flowmeters for the measurement of flowrate of a conductive liquid in a closed conduit running full. It covers their installation, operation, performance and calibration. This International Standard does not specify safety requirements in relation to hazardous environmental usage of the meter, nor does it apply to the measurement of magnetically permeable slurries, liquid metals nor usage in medical applications. This International Standard covers flowmeter types in both a.c. and pulsed d.c. versions.