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Pneumatic Float Switches

Model 106

Model 207

The Model 207 utilizes a Model 106 installed in a carbon steel tank. The tank features a sight glass and the wetted parts are carbon steel, brass, glass and Buna-N seals. The switch is designed to function as either a pneumatic high or low switch or as an automatic water make-up valve.

KPFS Pneumatic Float Switch

U.S. Patent 9,046,190 B1 & U.S. Patent 8,564,390 B1

The KENCO Model KPFS uses a float to determine the presence or absence of liquid in a vessel at the process connection. The float arm assembly consists of a float at one end and a magnet at the other. As the level in the vessel rises, the float rises and the magnet falls. The magnet actuates a second magnet on the other side of the pressure boundary. This second magnet is the reactive component in the snap acting switch that opens and closes the pneumatic valve. Because of the nature of the design, adjustment is rarely, if ever needed. In the event that adjustment is needed, an easy to use adjustment screw is provided. The Model KPFS is used to actuate pneumatic dump valves, such as the Model KDV Series Dump Valve, to control liquids in scrubbers, separators and other vessels. The pressure boundary contains no seals; it is a solid stainless steel barrier that passes a magnetic field, but no liquids. It is impossible for the process liquid to enter the switch enclosure through this barrier. The Model KPFS Pneumatic Float Switch can be ordered to have the pneumatic valve open when it senses a liquid level rising (-LR option) or open when it senses the liquid level falling (-LF option). A manual valve actuator is provided to open the valve manually, if desired.