4B ADB Lug Temperature Sensor


The ADB Lug series is a surface mount style NTC thermistor, Platinum RTD (PT100), or 4-20 mA "Milli Temp" type of continuous temperature monitoring. It is designed to bolt directly onto a bearing housing, motor, gearbox, machine casing or any other application where surface temperature monitoring is needed.


The mounting hole is 3/8” from the factory, but can be drilled up to 1/2” if needed.  The sensor can be connected to a PLC or to a hazard monitoring system, such as 4B’s Watchdog Super Elite, IE-Node, T500 Hotbus or T400 Elite.


The connections are not polarity sensitive therefore special connections requirements are eliminated.



  ABD Lug Surface Temperature Sensor  

• Surface Mount Installation


• NTC, PT100 RTD, or 4-20 mA Versions


• Continuous Temperature Monitoring


• 3/8” to 1/2” Bolt Entry


• 1/2” NPT Conduit Entry

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  NTC Type Technical Specifications -   Literature:  
  • Resistance at 77 °F: 10,000 Ohms   Product Datasheet Download PDF  
  • Resistance at 140 °F: 3,043 Ohms      
  • Resistance at 194 °F: 1,264 Ohms      
  • Sensing Voltage: 5 to 24 VDC      
  • Current Draw: 1 mA      
  • Minimum Temperature: -22 °F (-30 °C)   Product Dimensions:  
  • Maximum Temperature: 220 °F (105 °C)   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  PT100 RTD Type Technical Specifications -      
  • Resistance at 77 °F: 109.73 Ohms      
  • Resistance at 140 °F: 123.24 Ohms      
  • Resistance at 194 °F: 134.70 Ohms      
  • Coefficient: 3850 PPM/K (385)      
  • Sensing Voltage: 5 to 24 VDC      
  • Current Draw: 1 mA      
  • Minimum Temperature: -22 °F (-30 °C)      
  • Maximum Temperature: 220 °F (105 °C)      
  4-20 mA (Milli-Temp) Technical Specifications:      
  • Supply Voltage - 24 VDC Nominal (15 to 28 VDC)    
  • Overvoltage Rating - CAT I      
  • Reverse Polarity Protection - Yes      
  • Current at -40 °F (-40 °C) - 4 mA      
  • Current at 248 °F (120 °C) - 20 mA      
  • Temperature Accuracy - Typical ±1 °F (0.6 °C)      
  • Default Temp. Resolution Over Current Loop - 0.09 °F (0.05 °C)       
  • Operating Temperature (Probe) - Min. -40 °F (-40 °C)  Max. 248 °F (120 °C)      
  • Output Resolution (Typical) - 5 -10 µA      
  • Current Out of Range - 20.5 mA or < 4 mA      
  • CSA Class II Div 1 Groups E, F & G (U.S. & Canada)      
  CSA Certified         
  Part Numbers and Accessories:      
  • KIT-LUG-MIL - 4-20 mA Type      
  • KIT-LUG-ADB20 - NTC Type      
  • KIT-LUG-ADB29 - PT100 RTD Type      
  • ADBT4 - ADB Sensor Tester      
  Literature:   Product Dimensions:  
  Product Datasheet Download PDF   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  RTD Wiring Overview Download PDF      
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  Can the bolt hole be drilled out more than 1/2"?  
  It is not recommended to go beyond 1/2".  
ADB Lug Surface Temperature Sensor
Pillow Block Bearing Cut Away Diagram
Hot Bearing Failure
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