Series PLS Paddle Level Switch

Brand: Dwyer Instruments, LLC

Incorporated in the design of the PLS is a magnetic drive that is time proven by decades of use in our Mark Series valve position indicator product line.

A 1 rpm synchronous motor rotates the paddle, utilizing a magnetic drive. As product builds up, the paddle is impeded from moving and the resulting motor torque activates the output switches and stops the motor.

A spring mechanism reactivates the motor and returns the switches to normal state when the product no longer impedes the paddle rotation.

Standard construction is weatherproof with explosion-proof optional, and the unit can be side or top mounted.

The PLS is designed with the industry standard 1-1/4" male NPT connection and mounting flanges.
  • Magnetic drive isolates and completely seals the control head from the process and environment preventing material or dust from entering the control head
  • Motor shuts-off when paddle stalls increasing motor life, preventing motor burnout, and decreasing power usage
  • Slip clutch design enabled by the magnetic drive that prevents damage to motor and drive mechanism from sudden or excessive loading on the paddle
  • Status indication light on weatherproof models
  • Screw cover on the enclosure for easy access with no worries about losing bolts or screws
  • Modular design to allow field installation of any paddle, flanges, shaft extensions, or shaft guards
  • Flexible coupling available for protection of the paddle and drive from side loads, surges or impacts. Recommended for top mount applications with shaft extension and applications with large or heavy materials


Ambient Temperature Range

  • -40° to 85° C (-40° to 185° F)


  • Food & Beverage
  • Hoppers
  • Mining
  • Silos

Approvals & Certifications

  • cUL

Conduit Connection

  • 3/4” NPT Female


  • 3 Watts: Explosion-proof Models (Power Consumption)
  • 5 Watts: Weatherproof Models (Power Consumption)


  • Red LED - Activates when Switch is Made or when Switch is Not Made with RL Option

Electrical Connectors

  • Screw Terminal

Electrical Rating

  • 15 A at 120/230 Vac
  • 5 A at 24 Vdc

Enclosure, Body Material

  • Aluminum
  • Powder-Coated

Environmental Protection

  • Class 1, Div. 1, Groups B, C, D
  • Class II, Div. 1, Groups E, F, G
  • Explosion-proof (E, EH Construction)
  • IP66 (E, EH Construction)
  • IP66 (W, WH Construction)
  • NEMA 4X (E, EH Construction)
  • NEMA 4X (W, WH Construction)
  • WeatherProof (W, WH Construction)


  • 0.5 micron

Flange Material

  • 316 Stainless Steel
  • Carbon Steel


  • Dry Powder or Bulk Materials Compatible with Wetted Materials

NPT Connection

  • 1-1/4” NPT Male

Power Requirement

  • 110-120 Vac
  • 12 Vdc
  • 230 Vac
  • 24 Vac
  • 48 Vac

Process Temperature

  • -40° to 260° C (-40° to 500° F)


  • 80 kg/m³ to 3,200 kg/m³ - Min. Material Density

Shaft Material

  • 316 Stainless Steel
  • Galvanized Steel

Shaft Seal Material

  • PTFE

Supply Pressure - Maximum

  • psig: 30 (kPa: 207, bar: 2.07) - Max.

Switch Type

  • DPDT
  • SPDT

Wetted Materials

  • 316 Stainless Steel
  • Aluminum

  • Mining
  • Food and Beverage
  • Hoppers

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