KEFS Electric Float Switch

KEFS Electric Float Switch

KEFS Electric Float Switch

The KENCO Model KEFS 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 causes the switch to change state.

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 electrical contacts consist of a microswitch that can be either a single-pole, Double-throw (SPDT) or Double-pole, Double-throw configuration (DPDT). The SPDT Switch is available with either a 5 Amp or 8 Amp current load. The DPDT Switch is only available with a 4 Amp current load.


  • Simple Installation – Switch can be easily installed at the process connection in the vessel wall with simple hand tools
  • KFC External Float Chamber available for indirect switch vessel mounting
  • Multiple Circuitry Options – Available with a 5A SPDT, 8A SPDT or 4A DPDT switch
  • High-Temp Option – 5A SPDT version available with High Temperature rating option up to 400°F (204.4°C)
  • Stainless Steel Body – All wetted parts including switch body are manufactured from 303/304 Stainless Steel.
  • Stainless Steel Float – Float material is 304 Stainless Steel
  • Sealless Switch Barrier – Magnetic switch actuator operates through a solid steel barrier. There are no seals between the process and the switch compartment that could potentially cause a switch failure.
  • Certificate of Authorization including CRN numbers issued for use in Canadian provinces and territories
  • CSA Certified



KEFS Electric Float Switch Specifications

Description Specification
Specific Gravity > 0.53
Wetted Parts Standard 303/304 Stainless Steel
Optional 316 Stainless Steel
Process Connection Size Standard 2″ NPT
Temperature Range Standard -67°F to 257°F (-55°C to 125°C)
Process Pressure Range Vacuum to 2000 psig (137.89 bar)
Switch Types & Ratings Standard SPDT; 5A @ 250Vac; 5A @30Vdc restrictive
Optional SPDT; 8A @ 250Vac; 12A @ 12Vac restrictive
Optional DPDT; 4A @ 250Vac; 5A @ 30Vdc restrictive
Housing Rating (CSA Certified) Division 1:
Class I; Groups C&D
Conduit Connection 1/2″ NPT