Model 105

SKU: 105

Capacitance Level Switch, Optional Remote Mount, DPDT

The Delta Control 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 not sensitive to specific gravity (SPG) variations.

Many probe configurations are available. Integral mounting produces a simple one-piece unit generally resulting 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. Model 105 must be mounted vertically or at an angle to use the adjustable differential action. 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
  • Adjustable time delay of 1 to 60 seconds
  • Epoxy sealed electronics module survives harsh environments and area vibration
  • Application specific probe shapes, styles, configurations, and process connections
  • Wide choice of wetted materials including steel, stainless steel, PTFE, Kynar®, Monel, and ceramics
  • Threaded, flanged, or bracket mounting
  • Sealed relay for corrosive conditions


  • Range (Equivalent Admittance): 0 pF to 1000 pF (differential adjustable 1% to 50% of range)
  • Time Delay: 0.25 s to 60 s
  • Basic Supply Voltage (Optional): 120 ACV, 24 DCV
  • Ambient Operating Temperature:-40 °F to +185 °F (-40 °C to +85 °C)
  • Temperature Effect (0 °F to 150 °F):± 0.25 SU 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)

Additional Information


Capacitance Level Switch, Optional Remote Mount, DPDT

Level Measurement


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