• Reed Switch Installation

Kelco Engineering’s flow and level switches use reed switch technology for its reliability, long service
life, and stable,repeatable performance. Reed switches are considered superior to solid-state alternatives
in demanding real-world applications. Correct application is critical to getting the best performance from
these instruments. Kelco has produced a comprehensive guide covering all aspects of reed switch operation.
The guide addresses the physics of how reed switches work and the electrical limits governing them.
It covers protection techniques for both DC and AC circuits, including inductive kick and capacitive inrush.
Topics include selecting the right snubber, diode, MOV, or TVS device for specific circuits. The guide also
explains when to use an interposing relay or solid state relay. Cabling selection and installation for
noise-free, long-life operation is covered as well. The guide includes worked component selection examples,
circuit diagrams, and quick-reference tables.