WDA Motion Alignment Sensor
Belt or Chain Misalignment and Motion Monitor


Non-contacting extended range magnetic proximity sensor, not affected by dust or material build up, used to detect moving ferrous material up to 3 inches away from the sensor.

The WDA sensor can be used on bucket elevators to measure speed and alignment by sensing either the metal elevator buckets, or the ferrous bolts attached to plastic buckets.  A more specialized use for the WDA switch is as a broken/slack chain detector on drag chain conveyors, or as a non-contact speed switch for screw conveyors.

The sensor is used in conjunction with a PLC or with 4B's Watchdog™ Elite or A400 Elite control units.  Two output signals are provided: one signal is a pulse output, representing each bucket detected: the second signal is a continuous output when moving buckets are detected.



  WDA Motion Alignment Sensor  

• Magnetic Proximity Belt Speed and Belt Misalignment Sensor


• Detects Moving Steel Ferrous Targets


• Adjustable Sensing Range of 1 to 3 Inches


• Not Affected by Material Build Up


• Stainless Steel Construction


• High Temperature Version Available

  Product Questions? (309) 698-5611Phone or Email  Email    
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  Note: The WDA is Available in Two Models (Standard & High Temp.).   Literature:  
      Product Datasheet Download PDF  
  Standard WDA Sensor Technical Specifications:   (See Downloads for more literature)  
  • Part Number - WDA3V34C      
  • Voltage - 12 to 24 VCD ±10%   Technical:  
  • Supply Current - 65 mA   Product Manual - WDA3V34C Download PDF  
  • LED Indicator - Green (Flashing), Target Detected   Product Manual - HTAS1V34 Download PDF  
                                Green (Off), No Target Detected      
  • Outputs (Max) - 100 mA Sink (Pull)   Product Dimensions:  
                                 50 mA Source (Push)   WDA3V34C -  
  • Detection Range - Adjustable 1 to 3 inches (25 mm - 76 mm)   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  • Detection Rate - 20 to 2,000 Targets/Minute      
  • Cable - 6 Conductor (9 ft.)   HTAS1V34 -  
  • Conduit Entry - 1/2 in. NPT   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  • Temperature Rating -4°F to 122°F (-20°C to 50°C)      
  • Protection - IP66      
  • CSA Class II Div 1 Groups E, F & G (USA & Canada)      
  • ATEX, CE & IECEx Versions Available (Europe)      
  CSA - USA & Canada ATEX - Europe CE - Europe  IECEx      
  High Temperature WDA Sensor Technical Specifications:      
  • Part Number - HTAS1V34      
  • Voltage - 12 to 24 VCD ±10%      
  • Supply Current - 60 to 130 mA      
  • LED Indicator - Green (Flashing), Target Detected      
                                Green (Off), No Target Detected      
  • Outputs (Max) - 100 mA Sink (Pull)      
  • Detection Range - Adjustable 1 to 3 inches (25 mm - 76 mm)      
  • Detection Rate - 200 to 2,000 Targets/Minute      
  • Cable - 3 Conductor (12 ft.)      
  • Temperature Rating -14°F to 302°F Continuous (-25.5°C to 150°C)      
                                          -14°F to 356°F Maximum (-25.5°C to 180°C)      
  • Protection - IP66      
  • CE      
  CE - Europe       
  Part Numbers and Accessories:      
  • WDA3V34C ~ WDA Standard Sensor      
  • HTAS1V34 ~ WDA High Temperature Sensor      
  • WDAMB ~ Sensor Mount (Included with Sensor)      
  • SR2V5-1 ~ Speed Relay      
  • WDC4V46C ~ Watchdog Super Elite Monitoring System      
  • A4004V46C ~ A400 Elite Monitoring System      
  Literature:   Product Dimensions:  
  Product Datasheet Download PDF   WDA3V34C -  
      Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  Product Manual - WDA3V34C Download PDF   HTAS1V34 -  
  Product Manual - HTAS1v34 Download PDF   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  Note: Product manuals for older part numbers can be   WDA Mounting Template Download PDF  
  found under the Technical Support area.      
WDA High Temperature Sensor

WDA High Temperature Sensor

The WDA high temperature sensor (HTAS1V34) is for environments reaching temperatures up to +302° F (Continuous) or +356° F (Maximum).

WDAMB Sensor Mount

WDA Sensor Mount

The WDAMB senor mount (included with sensor) attaches to the WDA senor and the housing of the machine.  A bolt within the mount allows the sensor to be easily loosened and adjusted to the best sensing depth for the application.

Speed Relay

Speed Relay

The DIN rail mounted speed relay can be used with the WDA sensor to measure pulse rate (speed).  If the pulse rate stops or slows, the relay contact output within the speed relay will change and can sound an alarm or shutdown machinery.

More Info

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

A400 Elite Belt Alignment Monitor

A400 Elite

The A400 Elite monitors belt alignment on bucket elevators by detecting moving metallic buckets or bolts. The unit can be used on either one or two bucket elevators.

More Info

  The WDA sensor will not calibrate, what is the issue?  
  Make sure that the yellow/orange wire is connected to the red wire, this powers the potentiometer (calibration screw).  
  Why will the LED on the back of the sensor not turn on?  
  Check to see that there are no objects stuck to the face of the sensor (washer, bolts, etc.). Due to the magnetic pull  
  on the face of the sensor, objects can stick and interfere with the sensor.  
  What if the best sensing depth of the WDA sensor?  
  The WDA sensor can detect ferrous targets from 1 to 3 inches away.  Keep in mind the distance of other objects within  
  the sensing area. For example, a belt splice on a bucket elevator may be longer than the intended target and can  
  interfere or hit the WDA sensor.  
WDA Sensor
WDA High Temperature Sensor
WDA Sensor on Bucket Elevator
WDA Sensor on Bucket Elevator
  Belt Misalignment on a Bucket Elevator    
  (Belt Has Rubbed Through Metal Casing)