... mainly used to monitor and control the flow of the medium in pipes.FSF series oil flow ... switches that directly get signals from the flow of medium.FSF series oil flow switch can be ... , etc.FSF series oil flow switch has lots of advantage, such as simple usage, small bulk, light ... R134a, R22, R407C, R404A/R507, oil and mixture of oil and refrigerant. Type dataModelConnection size(inch)Flow rate ...