SRP Series Rotary Paddle Point Level Sensor

SRP Series Rotary Paddle Point Level Sensor

The SRP series rotary paddle point level sensor is the only bin level indicator at its price point available with state-of-the-art features.  This level switch works with virtually any powder or bulk solid material.

Product Description

The SRP Series is a rotary paddle point level sensor, bin level indicator or level switch used to detect the presence and absence of a wide range of powder and bulk solid materials within bins, hoppers and silos. The SRP rotary paddle point level sensor uses a robust synchronous motor to drive its shaft at approximately 1 RPM. The chosen paddle is attached to the shaft and rotates freely in the absence of material. As material comes in contact and impedes paddle rotation, two limit switches internal to the assembly will be activated as the motor is allowed to rotate slightly on its internal mounting plate. This movement is spring-loaded based upon the position of the sensitivity spring located above the data nameplate for quick and easy adjustment if required. Limit switch number 2 will change the state of the output relay contacts (or directly perform the output function for microswitch versions). Limit switch number 1 will disconnect power to the drive motor to extend its life.

  • Universal 20-250VAC/VDC power supply available
  • 10-28VDC version available, which includes adjustable on/off time delay
  • 110VAC and 220VAC dedicated power supply versions available
  • Local LED indication (not with dedicated power supply versions)
  • Technician friendly cover chain available
  • Unique seal handles operating pressure up to 58psi (4bar)
  • Easily adjusted sensitivity, no disassembly required
  • Automatic motor shutoff extends motor life
  • Remote test function (some versions)
  • Operating internal bin temperature up to 392⁰F (200⁰C) available
  • Standard, high temperature, cable extended, adjustable solid extended and reinforced shaft
  • 20-250VAC/VDC universal power supply (50/60Hz for AC); 110VAC or 220VAC 50/60Hz; 10-28VDC
  • Process temperature: -40⁰F~176⁰F (-40⁰C~80⁰C), high temperature version 392⁰F (200⁰C)
  • Microswitch, Relay or PNP/NPN output
  • Operating pressure: up to 58psi (4bar)
  • Fixed or adjustable 0~12s or fixed time delay
  • 1¼”NPT or other process connection
  • IP65 / NEMA 4X powder coated diecast aluminum enclosure
  • Class I, II, Div. 1 and 2 hazardous location rating available (FM approved; pending)
  • Wide variety of paddles, extensions and couplings (304SS materials)


  • High, low and intermediate bin level indication
  • Shutoff fill, open/close vessel discharge
  • Plugged chute detection


  • Concrete production
  • Cement
  • Asphalt
  • Agriculture
  • Feed & grain processing
  • Plastic processing
  • Food and ingredient production
  • Chemical
  • Water/wastewater
  • Steel
  • Many others


SRP Series Sales Catalog

SRP Series Operation Manual

Full Line Products Guide

Product Solutions for Bulk Solids Industries

Fields marked with a * are required