1, No movable parts 2, Suitable for variable diameter demands ... value is the basis of determining the flow velocity .Feature1,No movable parts . 2, Maintenance free. 3,Easy installation ... s(oil),20…2000cm/s(air)Output: PNP, NPN, Relay , NO+NC (SPDT)Power supply :24V±20%DCSwitching Current : Max ... .400mA(PNP or NPN type ), Max.4A( Relay type )Unload current: Max.80mAFlow indicator : LED (6)Set ...