The ifm efector SI Series Flow Switch utilizes thermal flow sensing technology to monitor the flow of liquids and gases within pipes in industrial and hygienic applications. The model SI5010 flow switch comes standard with an M18 x 1.5 Internal thread process connection, and this kit includes a process adapter with either a 1/2in NPT or G1/4 external thread. The setting range for liquids is 3 to 300 cm/s and for gases is 200 to 3000 cm/s.

The SI series features a robust stainless steel housing, which provides high reliability in harsh operating conditions. It also features a simple, user-friendly setup. Once installed, the flow range and switch points are adjusted with the push-button display on the unit. The multicolor LED display of the SI flow switch indicates the nominal flow range and the switch point. For added security, the SI series includes electronic locking capabilities to prevent accidental setting adjustments and offers an option to restore the unit to the factory settings if needed.

The thermal flow sensing technology relies on the cooling effect of flowing liquids. A higher flow velocity results in a greater cooling effect, and this can be reliably measured. The sensor tip houses two platinum RTD elements and a heat source. The flow rate is determined as these RTDs react to the physical effect of a flowing medium, conducting heat energy away from the sensor tip.

The SI5010 includes IO-Link capabilities, providing information including the current flow velocity up to 140% of the taught flow rate, the current medium temperature, and the status of switching signals. Instantaneous data delivery on flow velocity enables precise, real-time control over fluid dynamics, optimizing system efficiency and responsiveness to changing conditions. Real-time communication of flow presence or absence also safeguards pumps against dry running.