Qualitrol T/Guard Link (RevB) Optical Hot Spot Fiber Optic Monitor

Specific for Dry Type and Oil-Filled Power Transformers

A small form factor and cost oriented fiber optic hot spot monitoring transducer for dry type and oil-filled power transformers. The T/Guard Link Rev B’s standard MODBUS communication protocol allows for a quick and easy integration to any SCADA system. Optimized for use with the Qualitrol 507 and 509 systems.


  • Offers an easy way to link Neoptix probes to Qualitrol 509 and 507 transformer controllers
  • This updated module offers a similar SCADA interface to existing Neoptix T/Guard-Link systems
  • Interfaces to all Neoptix probes
Small and sturdy cast aluminum enclosure
  • RS-485 serial interface (Modbus and ASCII communication)
  • 4-20 mA analog outputs
  • Accuracy of +/- 1 ̊C
  • Available with up to 8 channels. With Modbus, up to 32 modules can be cascaded together
  • Ideal for OEM applications


  • Number of channels: 2, 4, 6 or 8. With Modbus, up to 32 modules can be linked together, to a theoretical total of 256 channels

Group Created with Sketch. Applications

Fiber optic hot spot monitoring system for any type of transformers

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