Qualitrol T/Guard 405 Fiber Optic Winding Temperature Monitor


The T/Guard-405 is multi-channel fiber optic transformer windings hot spot monitoring system. It has up to 16 optical channels and offers Modbus serial communication.


  • Tough and ruggedized sensors
  • Highly visible LED display
  • Extended operating temperature
  • Compatibility with serial Smart protocols
  • No gage factor or calibration required
  • RS-485, Modbus communication
  • 4-20 mA analog outputs
  • Accuracy of ±1°C
  • Resolution of ±0.1°C
  • Detachable connector blocks
  • On-board 32 MB memory
  • Available with 2 to 16 channels


  • Number of channels: 2 – 16

Group Created with Sketch. Applications

Direct transformer windings hot spot monitoring and other general purpose monitoring applications.
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