A400 Elite Trackswitch
Belt Alignment Monitor for Bucket Elevators


The A400 Elite Trackswitch belt misalignment monitor uses 4B WDA magnetic proximity sensors to monitor the alignment of the belt in bucket elevators. Each control unit incorporates two independent monitoring circuits for early detection of belt misalignment on one or two bucket elevators.

The 4B WDA sensors operate in pairs to detect the position of steel bolt heads or steel buckets as they pass through the sensor's adjustable magnetic field. Nuisance / false alarms are tuned out by setting a tolerance window on each sensor which allows for normal belt travel.

Status LEDs on the control unit indicate the alignment condition of the belts on the elevators, while internal relay contacts provide alarm and automatic shutdown of the elevator when hazardous misalignment conditions are detected.



  A400 Elite Belt Alignment Monitor  

• Bucket Elevator Belt Alignment Monitoring


• Uses up to 4 WDA Magnetic (Reluctance) Alignment Sensors


• Monitor Two Bucket Elevators or Top & Bottom of One


• 2 Separate Alarm Relays


• 2 Separate Stop Relays


• Push Button Testing Feature

  Product Questions? (309) 698-5611Phone or Email  Email    
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  A400 Elite Technical Specifications:   Literature:  
  • Power Supply - 100 to 240 VAC or 24 VDC   Product Datasheet Download PDF  
  • Alarm Relay Contacts - Zone 1: 1 Pole Normally Open (8A @ 250 VAC)   Full Line Product Catalog Download PDF  
                                               Zone 2: 1 Pole Normally Open (8A @ 250 VAC)   (See Downloads for more literature)  
  • Stop Relay Contacts - Zone 1: 1 Pole Normally Open (8A @ 250 VAC)      
                                             Zone 2: 1 Pole Normally Open (8A @ 250 VAC)   Technical:  
  • Sensor Inputs - 4 WDA Proximity Sensors   Product Manual Download PDF  
  • Sensor Supply - 24 VDC (A400 Internal Power Supply)      
  • Sensor Input Speed Range - 20 to 4,000 Pulses Per Minute   Product Dimensions:  
  • LED Indicators - Power, Sensor Target Detection, Alarm & Stop Indication   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  • Push Button Unit Testing      
  • IP66   Compare Speed Switches Compare Monitoring Systems  
  • CSA Class II Div 2 Groups F & G      
  • CSA Class II Div 1 Available (Class 2 Power Supply Required)          
  • ATEX, IECEx and CE Versions Available      
  CSA - USA & Canada ATEX - Europe CE - Europe IECEx            
  Part Numbers and Accessories:      
  • A4004V46C ~ A400 Elite (100 to 240 VAC or 24 VDC)      
  • A4004V4C ~ A400 Elite (24 VDC)      
  • PS3800V4 ~ Class 2 Power Supply (24 VDC / 3.8 A)      
  • WDA3V34C ~ WDA Magnetic Proximity Sensor      
  • HTAS1V34 ~ WDA High Temperature Magnetic Proximity Sensor      
  Literature:   Product Dimensions:  
  Product Datasheet Download PDF   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  Full Line Product Catalog Download PDF      
      Articles, Papers & Case Studies:  
  Technical Manuals & Documentation:   Hazard Monitoring Overview - GEAPS Paper Download PDF  
  Product Manual Download PDF   Monitoring Equipment (Grain Journal Series) Download PDF  
  RS485 Wiring Guide Download PDF   Bucket Elevator Monitoring Systems Download PDF  
      Combustible Dust Standards (Grain Journal Series) Download PDF  
  Note: Product manuals for older part numbers can be   Slack / Broken Chain Detection Download PDF  
  found under the Technical Support area.      
WDA Motion Alignment Sensor

WDA Motion Alignment Sensor

The WDA is a 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.  Used for detecting alignment on belt bucket elevators, or slack / broken chain on drag chain conveyors.

More Info

  Does 4B offer inspection, testing and commissioning services for your hazard monitoring systems?  
  Yes, the 4B Tech Team is available for on site services.   For more information, CLICK HERE.  
A400 Elite Belt Alignment Monitor
  Belt Misalignment on a Bucket Elevator CSB Video - Action To Prevent Dust Explosions  
  (Belt Has Rubbed Through Metal Casing)    
  Westwego Grain Elevator Disaster CSB Video - What Led to the Imperial Sugar Explosion  
  Preventative maintenance can help reduce the risk of equipment failure and consequent downtime.  When it comes to  
  monitoring your bucket elevators and conveyors, 4B can recommend the ideal combination of sensors and monitoring  
  systems to suit your requirements and budget.  
  4B has an extensive range of CSA / ATEX / IECEx approved hazard monitoring systems, misalignment switches,  
  bearing temperature monitors and level controls.  4B can offer you anything from a replacement sensor, to a fully  
  integrated hazard monitoring system which can be operated as a stand-alone device or connected to your PLC.  
  And if you do not want to install hazard monitoring sensors on every piece of equipment in your plant straightaway, 4B  
  can offer you a scalable solution that can be expanded as your needs grow.  
  To get a free recommendation from our engineers, CLICK HERE to fill out our online form.