标准摘要
[中文适用范围]： IEC 60947 的这一部分适用于感测气体、液体或粒状固体流量的流量开关。如果超过预设的流速值，这些开关就会改变其输出状态。这些流量开关是独立的，具有半导体开关元件，旨在连接到额定电压不超过 250 V 50 Hz/60 Hz ac 或 300 V dc 的电路 本标准未指定与爆炸传感材料一起使用和/或在爆炸场所使用的流量开关所需的附加措施。该标准无意涵盖具有模拟输出的设备。 [外文原描述]： This part of IEC 60947 applies to flow rate switches that sense the rate of flow of a gas, a liquid or a granular solid. These switches change their output state if a pre-set value for the speed of flow is exceeded. These flow rate switches are self-contained, have semiconductor switching element(s) and are intended to be connected to circuits, the rated voltage of which does not exceed 250 V 50 Hz/60 Hz a.c. or 300 V d.c.
英文名称Low-voltage switchgear and controlgear - Part 5-9: Control circuit devices and switching elements - Flow rate switches