Pumps usually used to convey fluids in a closed system. They are usually powered by an electric motor, which spins an impeller inside the pump body conveying the fluid inside the system.
Electro-Sensors' Speed Switches are used on Pumps to monitor critical speed, and guard against slowdown, stoppage, or reverse rotation that can result in costly process downtime, catastrophic machine damage, and material waste. Speed Switch Tutorial.
Ratemeters and Tachometers are commonly used in this type of application to display the RPM of the pump.
A Reverse Rotation Detector is commonly used on pumps to detect any undesired reversal of the rotating shaft.