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Tuffy® pneumatic side-mounted float switch

The Pneumatic Tuffy® liquid level switch is a compact pneumatic level switch designed for horizontal mounting in a tank or vessel through threaded or flanged pipe connections.

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The product

Float level switches technology

All float operated liquid level controls operate on the basic buoyancy principle which states “the buoyancy force action on an object is equal to the mass of liquid displaced by the object.” As a result, floats ride on the liquid surface partially submerged and move the same distance the liquid level moves. Because of this, they are normally used for narrow level differential applications such as high level alarm or low level alarm.


  • All 316 SS wetted components
  • Process pressures to 1500 psig (103 bar)
  • NACE and/or ASME B31.3 construction
  • Specific gravity as low as 0.40
  • 2-inch NPT mounting
  • Process temperatures from -40 to +300 °F (-40 to +150 °C)


  • Specific gravity rating
  • Carbon steel and stainless steel external mounting cages
  • Variety of thread-on flanges

Operating principle

Buoyancy force of process liquid on a float causes the float to move with the liquid’s surface. Float movement pivots a magnet into the field of a like-charged switch magnet. As the magnets repel each other, the switch magnet moves, actuating the switch.

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