Qualitrol T/Guard 408 and 408XT Fiber Optic Temperature Monitor


Rugged multi-channel fiber optic real-time hot spot monitoring system for dry-type and oil-filled transformers.


  • Provide essential data during transformer heat run
  • Maximize cooling efficiency with accurate hot spot temperature measurement
  • Optimize loading dynamically without compromising transformer life
  • Complements predictive hot-spot algorithm simulations
  • Compatible with Qualitrol Q-Link™ for Apple® iPhone®, OptiLink and OptiLink-II
  • Available with 4, 6, 8, 10, 12 or 16 channels


  • Number of channels – 4, 6, 8, 10, 12 or 16 optical channels

Group Created with Sketch. Applications

Local monitoring of oil-filled transformer and load tap changer with Qualitrol T2 temperature probes.

This product works well with