Gems Sensors and Controls
Flow sensors offer visual indication
The RotorFlow RFO fluid-flow sensors from Gems Sensors and Controls (Plainville, CT) provide a pulsed 4.5–24-V output that is proportional to the rate of flow. The direct-current output can be integrated into most digital logic units easily. The sensors include a highly visible paddlewheel that provides verification that fluids are moving.
As liquid passes through the unit’s body, a magnetic rotor spins at a rate proportional to the flow rate. The magnetic fields turning with the rotor excite a static Hall Effect sensor located in the body and generate a series of voltage pulses. Digital rate meters, totalizers, and other electronic controllers then use the output signal.
The RotorFlow sensors are available in port sizes of 0.25 to 1 in. and monitor fluids with flow rates ranging from 0.1 to 60 GPM. The units are appropriate for applications such as water purification, dispensing systems, chemical metering, and chillers and heat exchangers.