Belt and Pulley Misalignment Sensor


The Touchswitch™ is an electronic limit switch. When a belt misaligns or a pulley moves over and contacts the sensor, the built in solid-state electronic circuitry detects the lateral force of the belt or pulley and activates a voltage free relay contact. This relay contact is used to immediately alarm and shutdown the machine.


The face of the sensor is made from hardened stainless steel, so that there is virtually no wear when a belt contacts it. The sensor is not affected by dust or material build up and will still work when completely covered by material. Sensors are normally installed in pairs on opposite sides of the machine. Usually a pair of sensors at each pulley is used, but additional pairs can be installed as required. An external test knob allows for quick and simple sensor / system testing.


The sensors can be connected directly to a PLC input, or for greater safety, to a central independent monitoring system, such as the T500 Hotbus or Watchdog Super Elite.


Touchswitch Belt and Pulley Alignment Sensor

                             U.S. Patent #6,731,219




• Force Activated Belt and Pulley Misalignment Sensor


• Instantaneous Misalignment Indication


• Hardened Stainless Steel Contact Face


• External Test Feature


• Output LED Indication 


• Not a Rub Block 

  Product Questions? (309) 698-5611Phone or Email  Email    
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  Touchswitch Technical Specifications:   Literature:  
  • Power Supply - 12 VDC (TS2V3C) or 24 VDC (TS2V4C)   Product Datasheet Download PDF  
  • Power Consumption - 60 mA (TS2V3C) or 50 mA (TS2V4C)      
  • LED Indication - Indicates Power and Relay   Technical:  
  • Testing - External Test Knob   Product Manual Download PDF  
  • Output - Voltage Free Changeover Relay (5A 250 VAC, Non-Inductive)      
  • Body Construction - Presses Seamless Steel   Product Dimensions:  
  • Face Construction - Hardened and Annealed Stainless Steel   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  • Conduit Entry - 1/2 in. NPT      
  • Cable Length - 9 ft. (3 m)      
  • Conductors - 6 / 22 AWG      
  • Weight - 3 lbs.      
  • Protection - NEMA 4X, IP66      
  • CSA Class II Div 1 Groups E, F & G (USA & Canada)      
  • ATEX Version Available      
  CSA - USA & Canada ATEX - Europe  CE - Europe       
  Part Numbers and Accessories:      
  • TS2V3C ~ Touchswitch (12 VDC)      
  • TS2V4C ~ Touchswitch (24 VDC)      
  • TSS2 ~ Spacer      
  • TSC2 ~ Rubber Collar      
  • TSCAP ~ Clear Dust Cover      
  • PS3500V3 ~ 12 VDC Power Supply      
  • PS2500V4 ~ 24 VDC Power Supply      
  • TS202-CT5-2-1/4 ~ Touchswitch Hole Saw      
  • WDC4V46C ~ Watchdog Super Elite Monitoring System      
  • T5004V46C ~ T500 Elite Hotbus Monitoring System      
  • B4004V46C ~ B400 Elite Monitoring System      
  Literature:   Product Dimensions:  
  Product Datasheet Download PDF   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  Product Manual Download PDF      
  Note: Product manuals for older part numbers can be      
  found under the Technical Support area.      
Touchswitch Hole Saw

Touchswitch Hole Saw

Recommended tool for Touchswitch™ installation.  2-1/4” carbide teeth and cobalt steel pilot drill with split point tip prevents walking.  Built in flange stop prevents over drilling and an ejector spring makes removal of slug easier.

Touchswitch Spacer

Touchswitch Spacer

One spacer is supplied with the Touchswitch and is optional depending on the machine’s construction.

Touchswitch Rubber Collar

Touchswitch Rubber Collar

One rubber collar is supplied with the Touchswitch to properly seal the hole created for the Touchswitch and to protect the sides of the sensor from debris buildup.

Touchswitch Clear Dust Cover

Touchswitch Clear Dust Cover

One clear protective cover is supplied and used on the back of the Touchswitch to protect the test knob from dust and debris buildup.

Power Supply

12 and 24 VDC Power Supplies

Optional DIN rail mountable power supplies that can be used to power the Touchswitch™ as needed.

Watchdog Super Elite Hazard Monitor

Watchdog™ Super Elite Hazard Monitor

The Watchdog™ Super Elite processes signals from sensors for belt misalignment, belt speed & slip, continuous bearing temperature, pulley misalignment and plug conditions for bucket elevators or belt conveyors.

More Info

T500 Elite Hotbus Hazard Monitor

T500 Elite Hotbus™ Hazard Monitor

The T500 Elite Hotbus is a serial communications system designed to monitor up to 256 sensors on multiple bucket elevators and conveyors for belt speed, belt alignment, bearing temperature, level and plugged conditions.

More Info

B400 Elite Belt Alignment Monitor

B400 Elite Beltswitch Hazard Monitor

The B400 Elite Beltswitch belt misalignment monitor uses 4B Touchswitch sensors to monitor belt and pulley alignment in bucket elevators and conveyors.

More Info

  Is the Touchswitch™ a rub block?  
  No, the Touchswitch is a pressure sensitive contact switch.  When the belt misaligns and contacts (touches) the  
  sensor with enough force, an alarm is triggered.  
  Rub blocks are designed to detect the heat generated by friction when the belt rubs against the brass block.  In  
  dust hazardous environments, heat is what you are trying to avoid.  Also, belts can misalign and rub against the  
  brass for a short period of time, but not long enough for the sensor to detect any heat build-up.  In either scenario,  
  rub blocks can be dangerous and ineffective in detecting belt misalignments.  
Touchswitch on Elevator Leg
Touchswitch on Enclosed Belt Conveyor
Touchswitch on Open Belt Conveyor
  Belt Misalignment on a Bucket Elevator    
  (Belt Has Rubbed Through Metal Casing)