Liquid level monitoring remains one of the most important sensing functions across industrial, commercial and medical equipment. Whether preventing tank overfill, protecting pumps from dry-running conditions or providing simple level indication, engineers need sensing solutions that deliver long-term reliability, straightforward integration and dependable performance.
The Sensata Technologies Cynergy3 range of float switches has earned a strong reputation within the industrial sensing market. Designed for accurate point-level detection in a wide variety of liquids and operating environments, these devices provide a simple yet highly effective means of monitoring liquid levels. As part of Sensata's extensive portfolio of level and flow sensing products, Cynergy3 float switches are widely used in applications where reliability, safety and operational efficiency are critical.
RSF Series Float Switches
The Sensata Cynergy3 RSF Series is a family of compact reed-switch-based float switches designed for single-point liquid level detection. Available in a variety of materials and mounting configurations, the range enables designers to select the most suitable solution for their application and operating environment.
Material selection is particularly important when monitoring liquids such as water, oils, fuels, cleaning solutions, chemicals and food-grade media. Choosing the correct float switch material helps ensure long-term compatibility, minimises maintenance requirements and improves operational reliability. To meet these diverse requirements, the RSF family is available in a range of engineering plastics and metal constructions, offering excellent flexibility across multiple industries.
The series includes several mechanical formats, mounting options and switch configurations, allowing installation in different tank designs and vessel geometries while maintaining reliable level detection.
The Versatile RSF40 and RSF50 Series
Among the RSF product families, the RSF40 and RSF50 Series are amongst some of the most popular and versatile solutions. Combining compact dimensions with robust construction and enhanced switching capability, the RSF40 and RSF50 Series are suitable for a broad range of liquid-level monitoring applications.
The compact footprints of the RSF40 and RSF50 Series makes integration straightforward, even where installation space is limited. At the same time, the proven reed-switch design provides exceptional reliability and long operational life, making them an ideal choice for equipment manufacturers seeking a cost-effective level sensing solution.
RSF40 Series Dimensions
RSF50 Series Dimensions
The RSF40 and RSF50 Series operate using a simple but highly effective sensing principle. A permanent magnet is housed within the float, which moves vertically along a stem as the liquid level changes. When the float reaches the switch actuation point, the magnetic field activates an internal reed switch, generating a switching output. This creates a simple and highly reliable switching output that can be used to trigger visual or audible alarms, enable and protect pumps or provide level feedback to a control system.
Basic Float Switch Construction
Key Benefits of the RSF Series
The operating principle of the RSF family provides numerous advantages for system designers and equipment manufacturers:
The RSF Series supports applications from water treatment and industrial automation through to food processing, medical equipment and energy infrastructure. Sensata positions its level and float switch solutions for environments where reliability and safety are paramount, particularly where overfill prevention and liquid management are critical.
A Proven Solution for Reliable Level Detection
The Sensata Cynergy3 RSF Series provides engineers with a dependable and economical solution for point-level liquid detection. With multiple material options, mounting configurations and proven reed-switch technology, the RSF Series delivers a simple, robust and highly effective sensing solution.
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