Rotech Rotary Shaft Encoder - Polypropylene


The 4B heavy duty polypropylene Rotech rotary shaft encoder is used primarily for protecting equipment and personnel from dangerous underspeed/belt slip conditions in extreme environments. Other applications include accurate speed control, direction of rotation detection, gate position indication and counting the number of revolutions of the shaft.


An inductive sensing device in the body of the encoder detects a steel rotor. On slow speed or accurate position control, a photo diode detects the slots on a steel disk. One pulse is created for each rotor or slot so the unit can be connected directly to a PLC/computer or 4B control module. The shaft to be monitored is drilled and taped to take the 1/2 in. UNC Rotech Bolt. The unit is secured to the shaft with this bolt and is able to move with the shaft. No guards are required as the rotating components are encased inside the housing of the encoder. No brackets are required as the encoder couples directly to the end of the shaft and floats with the shaft.



  Rotech Encoder - Polypropylene  

• Economical Rotary Shaft Encoder


• Monitor Speed, Distance, Direction, Belt Slip, Stop Condition


• Polypropylene Construction


• Totally Self Contained (No Guards Required)


• 1 to 1,000 Pulses Per Revolution


• Intrinsically Safe Version Available

  Product Questions? (309) 698-5611Phone or Email  Email    
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  • Specifications
  • Downloads
  • Accessories
  • FAQ's
  • Images
  • Videos
  Rotech Encoder Technical Specifications:   Literature:  
  • Enclosure - Polypropylene with 30% Glass Fiber   Product Datasheet Download PDF  
  • Maximum Operating Speed - 1,000 RPM (5,000 RPM High Speed Version)   Full Line Product Catalog Download PDF  
  • Thread Size - 1/2 in. UNC (12 mm)   (See Downloads for more literature)  
  • Operating Temperature - +212° F (+100° C) to -13°F (-25° C)      
  • Weight - 3 lbs.   Technical:  
  • Protection - IP66   Product Installation Download PDF  
      Rotech Selection Guide Download PDF  
  Output Types & Supply Voltages      
  • VN - NAMUR 8.2 VDC (1 to 60 Pulses Per Rev.)   Product Dimensions:  
  • VA - NPN 10 to 30 VDC (1 to 60 Pulses Per Rev.)   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  • VB - PNP Output 10 to 30 VDC (1 to 60 Pulses Per Rev.)      
  • VC - PNP / NPN 10 to 30 VDC (1 to 1,000 Pulses Per Rev.)      
  • VD - NPN / PNP 10 - 30 VDC (1 to 60 Pulses Per Rev.)      
  • VE - TRIAC 20 to 240 VAC / VDC (1 to 20 Pulses Per Rev.)      
  • VA Q - Quadrature 10 - 30 VDC (1 to 40 Pulses Per Rev.)      
  • VB Q - Quadrature 10 - 30 VDC (1 to 40 Pulses Per Rev.)      
  • VC Q - Quadrature 10 to 30 VDC (1 to 1,000 Pulses Per Rev.)      
  -- See Rotech Selection Guide for More Detail on Output Types      
  • CSA / NRTL Class II Div. 1 (U.S. & Canada)      
  • Intrinsically Safe Version Available      
  CSA - USA & Canada ATEX - Europe CE - Europe  IECEx      
  Part Numbers and Accessories:      
  • RSEP ~ Rotech Encoder - Polypropylene      
  • MAG2000 ~ Mag-Con™ Magnetic Connector      
  • SR2V1-1 ~ Speed Relay      
  • TACH3V5 ~ Tachometer      
  Literature:   Product Dimensions:  
  Product Datasheet Download PDF   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  Full Line Product Catalog Download PDF      
  Product Installation Download PDF      
  Rotech Selection Guide Download PDF      
  Note: Product manuals for older part numbers can be      
  found under the Technical Support area.      

Mag-Con™ Magnetic Connector

The Mag-Con (MAG2000) is an optional magnetic connector that screws onto the Whirligig and magnetically couples it to the shaft being monitored. The Mag-Con is made from stainless steel, has a holding force of over 150 lbs. and can withstand speeds up to 300 RPM.

Tacho Display

Tacho Display

The Tacho is a low cost electronic display which can be user programmed to indicate speed, distance or time intervals.

See Tacho

Speed Relay

Speed Relay

The DIN rail mounted speed relay can be used with any Rotech encoder, and with 4B’s WDA or P800 proximity sensors.  A user adjustable underspeed relay contact output can sound an alarm or shutdown machinery when the shaft speed falls below the preset level.

See Speed Relay

  The shaft is turning, but there is no signal coming from the sensor. What is the problem?  
  The bolt connecting the encoder to the shaft is not tight. Remove the back plate and tighten down the connecting bolt  
  with a hex key (Allen wrench). Note: the hex key will be under a plastic cap, be sure to replace this cap before  
  reassembling the back plate on the encoder.  
Rotech Encoder - Stainless Steel
Rotech Encoder on Bearing
Rotech Encoder Installed
Rotech Encoder Installed
  No videos currently available for this product.