T500 Elite Hotbus™
Hazard Monitoring System for Bucket Elevators and Conveyors


The T500 Elite Hotbus™ is a serial communications system designed to monitor up to 256 sensors for combined belt alignment, belt speed, continuous bearing temperature, pulley alignment, level indication (bin / silo) and plug conditions on bucket elevators and conveyors.  With automatic machine shutdown capability and PLC / PC compatibility, this advanced microprocessor based system offers low cost installation, versatility and easy system expansion. Complete system data is available with HazardMon.com®.

HazardMon.com is a secure cloud based hazard monitoring solution providing status notifications and data logging for bucket elevators and conveyors. Live system status, graphs and historical data can be viewed on any web-enabled device (smartphone, tablet PC, desktop or laptop computer). Emails can be sent to notify users whenever a change in the system's health is detected. An automated maintenance feature allows site operators to verify that all sensors on the system are operational and working correctly.



  T500 Elite Hotbus Hazard Monitor  

• Designed for Multiple Elevator Legs or Conveyors


• Monitors: Belt Speed, Belt Alignment, Bearing Temperature,


   Pulley Alignment, Bin/Silo Level Indication & Plug Conditions


• Serial Network System, Accepts Inputs from 256 Sensors


• LCD Displays System Status


• HazardMon.com Cloud Based Monitoring

  Product Questions? (309) 698-5611Phone or Email  Email    
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  T500 Elite Hotbus™ Technical Specifications:   Literature:  
  • Power Supply - 120 to 240 VAC or 24 VDC (T5004V46C)   Product Datasheet Download PDF  
  • Power Consumption - 12 Watts Maximum   Full Line Product Catalog Download PDF  
  • Alarm Relay Contacts - 1 Pole Normally Open (8A @ 250 VAC)   (See Downloads for more literature)  
                                               64 (Optional Using R500 Interface)      
  • Sensor Supply - Use External 24 VDC Supply   Technical:  
  • Maximum Nodes - 64   Product Manual Download PDF  
  • Sensing Temperature Range - +230°F (+110°C) to -23°F (-31°C)   Installation Guide Download PDF  
  • Display - 4 Line LCD      
  • Keyboard - 5 Programming Keys   Product Dimensions:  
  • Status Indicators (Front Panel) - Power & Alarm   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  • HazardMon.com® Compatible      
  • Protection - IP66   Compare Speed Switches Compare Monitoring Systems  
  Approvals:   HazardMon.com     Wireless Options  
  • 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:      
  • T5004V46C ~ T500 Elite Hotbus (120 to 240 VAC or 24 VDC)      
  • PS3800V4 ~ Class 2 Power Supply (24 VDC / 3.8 A)      
  • HOTBUS-TN4 ~ Hotbus Node (4 Input)
  • HOTBUS-SN2 - Speed Node (2 Input)      
  • HOTBOX ~ Node Enclosure      
  • EXPENC1 ~ Explosion Proof Node Enclosure      
  • HOTBUS-TESTER ~ Hotbus Node Tester      
  • R5004V46C ~ R500 Elite Alarm Relay Interface      
  • F5004V46C ~ F500 Elite Fieldbus Gateway**      
    ** Available Gateways - Ethernet, DeviceNet, Profibus, Modbus      
  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  
  T500 Elite Hotbus Manual Download PDF   Monitoring Equipment (Grain Journal Series) Download PDF  
  T500 Elite Hotbus Installation Guide Download PDF   Bucket Elevator Monitoring Systems Download PDF  
  Sample T500 Network Diagram Download PDF   Combustible Dust Standards (Grain Journal Series) Download PDF  
  RS485 Wiring Guide Download PDF   Slack / Broken Chain Detection Download PDF  
  F500 Devicenet Manual Download PDF      
  F500 Ethernet Manual (Version 7.X.X) Download PDF      
  F500 Ethernet Manual (Version 1.4.3) Download PDF   HazardMon.com® & Wireless Options:  
  F500 Profibus Manual Download PDF        HazardMon.com     Wireless Options  
  R500 Manual Download PDF    
  Hotbox TN4 Manual Download PDF    
  RF Tripper Node Download PDF    
  Note: Product manuals for older part numbers can be    
  found under the Technical Support area.    
  To See Illustrated Sensor Placement Diagrams For Specific Equipment, CLICK HERE  
Bearing Temperature Sensor

Bearing Temperature Sensor

The ADB series have been designed to allow the depth of the sensor to be adjustable.  They screw directly into a bearing housing through the existing grease zerk thread.  Each sensor is fitted with a grease zerk to allow lubrication of the bearing without the need for removal of the sensor.

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ADB Bearing Sensor Tester

ADB Bearing Sensor Tester

The ADB Sensor Tester has been designed to test 4B adjustable depth bearing (ADB) temperature sensors in the field.  During planned maintenance or periodic testing, this diagnostic tool to verify the alarm and shutdown sequences of the control unit are functioning as expected.

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Surface Temp Sensor

Surface Temperature Sensor

The WDB7 bolts directly onto a bearing housing, motor, gearbox, or machine casing for continuous temperature monitoring.

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 Touchswitch Belt Misalignment Sensor

Belt Misalignment Sensor (Contact)

The Touchswitch™ is an electromechanical limit-switch with no moving parts, which detects tracking and misalignment problems on bucket elevators and conveyors. Unlike a rub block that utilizes friction (heat) to activate, the Touchswitch is pressure sensitive for safer and more reliable monitoring.

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  Brass Rub Blocks  

Belt Misalignment Sensor (Temperature)

Brass rub blocks process temperature information.  When the belt from a bucket elevator or conveyor rubs against the brass block, heat is created from the friction which is then relayed to a temperature sensor generating an alarm.

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WDA Motion Alignment Sensor

Motion Alignment Sensor

WDA series are 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.

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Speed Switch

Speed Switch Sensor

The M800 Elite speed switch is a inductive proximity sensor for monitoring shaft underspeed conditions.  With two under speed relay contact outputs and a pulse output, the self contained unit provides the user with easy on site installation and consistent reliability.

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SpeedMaster Speed Switch Tester

SpeedMaster™ Speed Switch Tester

The SpeedMaster™ with Pulse Pilot is the only device that accurately tests the calibration of a speed switch, and allows testing of the alarm and shutdown features of the sensor while installed on the machine shaft.

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Rotech Encoder

Rotech Rotary Shaft Encoder

The Rotech rotary shaft encoder is used primarily for protecting equipment and personnel from dangerous underspeed/belt slip conditions in extreme environments.

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Binswitch Plug/Choke Sensor

Plug / Choke Sensor

The Binswitch detects level or plug situations for bulk granular solids or liquids in tanks, bins, or silos and can be used as a plug or choke detector in chutes, conveyors and elevator legs.

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Rotary Level Indicator

Rotary Level Indicators

The Roto-Level series are electromechanical rotary level indicators for point level indication of bulk granular solids in bins, tanks, silos.  Available with vertical extensions up to 14 feet.

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Autoset Level Indicator

Auto-Set™ Level Indicators

The Auto-Set™ series are RF capacitance point level indicators with push button calibration and material build-up compensation for high, intermediate or low level detection of liquid, powders or free-flowing granular solids.  Once the unit is calibrated for a specific application, it never has to be re-calibrated.  Available with vertical extensions up to 33 feet.

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Hotbus TN4 Node

Input Node (HOTBUS-TN4)

The TN4 is a four input sensor node, powered by 24 VDC.  Each input can be an NTC thermistor, PTC thermistor or Volt-Free Contact input; the types may be interchanged on a single node.  The Node has a unique 4 digit address which is used to communicate to the T500 via a two wire serial RS485 connection.

Hotbus SN2 Speed Node

Speed Node (HOTBUS-SN2)

The SN2 is a two input speed node, powered by 24 VDC.  The node is able to monitor two independent pulse (speed) sources for dangerous under speed conditions.  The SN2 will support pulses which are PNP or sourced.  The Node has a unique 4 digit address which is used to communicate to the T500 via a two wire RS485 connection.

Hotbus Hotbox Node Enclosure

Node Enclosure (HOTBOX)

Polycarbonate enclosure to contain and protect TN4 and SN2 nodes in dust hazard areas.

Hotbus Explosion Proof Node Enclosure

Explosion Proof Node Enclosure (EXPENC1)

Metal enclosure to contain and protect TN4 and SN2 nodes in explosion hazard areas.

Hotbus Node Tester

Hotbus™ Node Tester

The Hotbus Node Tester is a portable handheld testing unit that can be used in the field to determine the operational status of any Hotbus communications node.

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R500 Alarm Relay

R500 Elite Alarm Relay Interface

The R500 is a microprocessor-controlled unit, which accepts signals from the T500 Elite Hotbus™ monitor, and is able to cause alarm or shutdown of equipment when a sensor exceeds its programmed alarm tolerance.

F500 Fieldbus Gateway

F500 Elite Fieldbus Gateway

The F500 is a communications gateway that allows for single point access to a maximum of four T500 Elite Hotbus™ systems via Fieldbus protocol.  Fieldbus communication protocols supported include: Ethernet IP, Modbus TCP, Modbus RTU, DeviceNet, Profibus and others.

  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.  
T500 Elite Hotbus
T500 Elite Hotbus Installed
  HazardMon.com® Cloud Based Monitoring 4B Hazard Monitoring Systems  
  CSB Video - Action To Prevent Dust Explosions CSB Video - Combustible Dust: An Insidious Hazard  
  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.