Model 105

SKU: 105

Capacitance Level Switch, Optional Remote Mount, DPDT

The Delta Controls Model 105 Capacitance Level Switch uses RF Admittance technology to produce a switching action when a material level crosses the set point. The interface position of two liquids with different dielectric constants is accurately detected, including with cloudy interface conditions. One of the liquids should be nonconductive. Model 105 is insensitive to specific gravity (SPG) variations.

Many probe configurations are available. Integral mounting produces a simple one-piece unit generally results in the lowest installed cost. Alternately, the Model 105 electronics module may be connected via coaxial cable up to 50 feet away.

Horizontal mounting is usually preferred for alarm action as it provides the sharpest switch point definition. For adjustable differential action use, Model 105 must be mounted vertically or at an angle. The material level must move past the two points on the probe where switch action is to occur.


  • RF admittance measuring circuitry
  • Insensitive to process coatings and buildup
  • Integral or remote electronics housing
  • Heavy-duty sealed relay contacts
  • High or low relay fail-safe action
  • Adjustable time delay of 1 to 60 seconds
  • Sealed electronics module survives corrosive and harsh environments as well as area vibration
  • Application specific probe shapes, styles, configurations, and process connections


  • Range (Equivalent Admittance): 0 pF to 1000 pF (differential adjustable 1% to 50% of range)
  • Relay Contacts: Sealed for corrosive conditions 5 A at 250 ACV DPDT
  • Time Delay: 0.25 s to 60 s
  • Basic Supply Voltage (Optional): 120 to 240 ACV, 24 DCV
  • Ambient Operating Temperature:-40 °F to +185 °F (-40 °C to +85 °C)
  • Temperature Effect (0 °F to 150 °F):Typically < 0.10 in (2 mm) (water)
  • Housings:4X Hose-proof; Class 1, Division 1, Groups BCD, EFG explosion-proof
  • Housing Material : Aluminum, PVC, stainless steel (other materials available)

Certifications & Approvals

  • Housing Option: Third Party Listed by CSA NRTL/C (USA and Canada) Class I, Groups B, C and D; Class II, Groups E, F and G; Class III; Encl 4X

Required Ordering Information

  • Detailed model number
  • Tag or nameplate detail (if required)
  • Documentation & testing packages (if required, refer to Additional Resources in the product catalog)

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Additional Information


Capacitance Level Switch, Optional Remote Mount, DPDT

Level Measurement


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