ISO 20456:2017适用于工业电磁流量计，用于测量满负荷运行的封闭管道中导电液体的流量。它涵盖了使用交流电（AC）和脉冲直流电（DC）电路来驱动励磁线圈和仪表的流量计类型，这些线圈和仪表由主电源供电，也可由电池或其他电源供电。 ISO 20456:2017不适用于插入式流量计或电磁流量计，其设计用于明渠或部分满管运行，也不适用于磁渗透泥浆或液态金属应用的测量。 ISO 20456:2017未规定与流量计危险环境使用相关的安全要求。

ISO 20456:2017 applies to industrial electromagnetic flowmeters used for the measurement of flowrate of a conductive liquid in a closed conduit running full. It covers flowmeter types utilizing both alternating current (AC) and pulsed direct current (DC) circuits to drive the field coils and meters running from a mains power supply and those operating from batteries or other sources of power. ISO 20456:2017 is not applicable to insertion-type flowmeters or electromagnetic flowmeters designed to work in open channels or pipes running partially full, nor does it apply to the measurement of magnetically permeable slurries or liquid metal applications. ISO 20456:2017 does not specify safety requirements in relation to hazardous environmental usage of the flowmeter.