Rotary Paddle Level Indicator


The Roto-Safe rotary paddle switch is designed to detect high and low levels of bulk granular solids in bins, tanks, silos, and as blockage detectors in spouts where failsafe detection is required, or for dust hazard areas.

The detection of material is achieved by a rotating paddle.  If material impedes the rotation of the paddle, the motor topples of its axis and triggers a contact.  The power supply to the motor is cut and the contact signals that a critical level has been reached, which will cause the motor for any inlet or outlet to close down or start up.  When the level of the material reaches normal levels again, the motor returns to its initial position and restarts.

In the case of a power failure, the Roto-Safe has a fail safe relay that will signal the control room or sound an audible alarm indicating that the unit is not working.  Through the control circuit, this alarm can stop any motor filling or emptying the silo.

The Roto-Safe also has a built in rotation detection circuit.  The output operates from 0 to 20 seconds after the motor has stalled.  This feature can be tested by using the magnetic test feature on the outside of the case.



  Roto-Safe Rotary Paddle Level Indicator  

• High and Low Level Indication


• Dust Hazard Approved (CSA)


• Internal Sensitivity Adjustment


• Adjustable Timer


• Power Failure Alarm


• 14 Foot Vertical Extensions (Maximum)

  Product Questions? (309) 698-5611Phone or Email  Email    
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  Roto-Safe™ Technical Specifications:   Literature:  
  • Power Supply - 120/240 VAC or 24 VDC (Universal Supply)   Product Datasheet Download PDF  
  • Supply Tolerance - ± 10%   Full Line Product Catalog Download PDF  
  • Power Consumption - 450 mA   (See Downloads for more literature)  
  • Fuse - 5 Amp      
  • Operating Temperature - 140°F (60°C) to -4°F (-20°C)   Technical:  
  • Output - Voltage Free Relay   Product Manual Download PDF  
  • Contact Rating - 3 Amps/250 Volts      
  • Time Delay - 0 to 120 Seconds (Adjustable)   Product Dimensions:  
  • Output Mode - High or Low Level (Selectable)   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  • Sensitivity - Normal and Low Ranges (Factory Preset - Normal)      
  • Conduit Entry - 1/2 Inch NPT (2)   Compare Level Indicators Compare Level Indicators  
  • Mounting - 1-1/4 Inch NPT      
  • Connections - Screw Terminal Block      
  • LED Indicators (3) - Power On, Motion and Output On      
  • Enclosure - Flame Retardant Glass Reinforced Nylon      
  • Protection - IP65, NEMA 4      
  • CSA Class II Div 1 Groups E, F & G (U.S. & Canada)      
  • ATEX Versions Available      
  CSA - USA & Canada ATEX - Europe  CE - Europe       
  Part Numbers and Accessories:      
  • RTS1V0C ~ Roto-Safe      
  • RLISP1 ~ One Vane Insertable Paddle      
  • RLISP2 ~ One Vane Insertable Paddle (Extended)      
  • RLISP3 ~ Three Vane 5 Inch Diameter Paddle      
  • RLISP4 ~ Three Vane 7 Inch Diameter Paddle      
  • SMP ~ Side Mounting Plate      
  • SMPS ~ Side Mounting Plate (Stainless Steel)      
  • TMP ~ Top Mounting Plate      
  • TMPS ~ Top Mounting Plate (Stainless Steel)      
  Literature:   Product Dimensions:  
  Product Datasheet Download PDF   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  Full Line Product Catalog Download PDF      
  Product Manual Download PDF      
  Automatic Level Control Wiring Download PDF      
  Note: Product manuals for older part numbers can be      
  found under the Technical Support area.      
One Vane Rotary Paddle

One Vane Insertable Rotary Paddles

The RLISP1 is designed for materials over 70 PCF (coal, stone, etc.), while the RLISP2 is designed for materials between 30 to 70 PCF (powders, light grain, seed, etc.).

Three Vane Rotary Paddle

Three Vane Rotary Paddles

The RLISP3 (5 inch diameter) is designed for materials between 30 to 70 PCF (grain, beans, oil seeds, etc.).  The RLISP4 (7 inch diameter) is designed for materials under 30 PCF (flour and light materials).

Mounting Plate

Mounting Plates (Top & Side)

The SMP (side mounting plate) and TMP (top mounting plate) are zinc plated steel mounts with a 1-1/4 inch NPT coupling.   Stainless steel versions are also available.

  Can the Roto-Safe be side or top mounted?  
  Yes, it can be either top or sided mounted.  
Roto-Safe Rotary Level Indicator
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