FineTek SA Capacitance Solid Level Switch

The Finetek SA Series Capacitance Switch for liquids and solids can be used in mediums such as liquids, pastes, syrups, powders, granules, flakes, and chips. Its broad application and rugged build make it highly versatile across all industries. Capacitance switches rely on electrical capacitance theory (the ability of a medium to store electrical energy). When an electrical circuit has two separated conductive plates, the space between the plates acts as a capacitor and stores the electrical energy. Mediums have differing conductivity and dielectric constants which affects their energy storage capability. When the switch comes into contact with the medium, it can detect a change in the surroundings, which actuates the switch accordingly. Materials with high conductivity or high dielectric constants such as water tend to have high capacitance. The opposite applies to low conductive substances such as popcorn, wax, or air. Thus the switch works well in mediums with reasonably high dielectric constants or conductive solutions.

  • Ground-level test function available
  • Max. operating temperature: 800°C
  • Sensitivity and time delay adjustable


  • Standard Type (SA110 & SA111 A/B/C)
    Suitable for general use.
  • Hi-Temp Type (SA120 & SA128 A/B/C)
    Suitable for high temperature environment.
  • Anti-Corrosion Type (SA130 & SA132 A/B/C)
    Suitable for corrosive environment.
  • Remote Probe Type (SA140 A/B/C)
    For use with vibrator equipped with tank.
  • Wire-Probe Type (SA150 A/B/C)
    Suitable for silo or large-size tank.
  • Plate-Probe Type (SA160 A/B/C)
    Suitable for granules and at the lower position of tank side.
  • Explosion-Proof Type (SA270 ~ SA279)
    Ex dia II C T4~T6, DIP A21 TA, T3~T6
  • Explosion-Proof Type (SA370 ~ SA378)
    Ex ia IIC T3~T6
    Equipped with SA-75U signal conditioner can be used in hazardous areas.
  • Anti-Static Type (SA180 & SA181 A/B/C)
    Suitable for electrostatic environment
    (It won’t be damaged by the electrostatic discharge)

Catalog: Finetek SAX Capacitance Solid Level Switch Datasheet

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