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.
SANS 60947-5-9:2007 history
2007SANS 60947-5-9:2007 Low-voltage switchgear and controlgear Part 5-9: Control circuit devices and switching elements - Flow rate switches