The ProSense FSD Series flow switch sensor utilizes a spring-supported piston that is lifted by the flowing medium. The piston position is detected via an inductive sensor and is output as a digital signal. The spring resets the piston to its initial position with decreasing flow. This allows the sensor to be mounted in any position (horizontally or vertically) and function as a check valve.
FSD series flow switch prices start at $129.00Complete Flow Switches Overview
ProSense Flow Switch
for liquid applications