FFProbe – Rotor Flux Monitoring

Rotor Magnetic Flux Sensor for Greater Than 50mm Air Gap

Product Overview

The Folding Flux Probe (FFProbe) is used for detection of shorted rotor windings in generators and synchronous motors where the air gap exceeds 50mm by measuring air gap flux.

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Works with the Following Assets
Assists with the Following Type of Monitoring

The Iris Power Folding Flux Probe (FFProbe) is a non-metallic sensor that detects the magnetic field emanated from each rotor pole in generators and synchronous motors to determine the presence and severity of failure mechanisms including out of round rotor, off center rotor, thermal imbalance of rotor poles, loose poles, stator Migration or shorted rotor turns.

These failure mechanisms can lead to decreased generator power, higher electrical losses, inability to meet the machine MVA rating, significant vibration and catastrophic ground faults.

Product Details


  • Iris Power FFProbe is a customizable folding probe used in generators with an air gap distance of 50 mm or over.
  • The probe height is customized during installation to accommodate the machine design.
  • The probe is foldable to allow for rotor removal and introduction without damaging the probe
  • The FFProbe assembly includes the probe, probe cable and termination box.
  • ATEX, IECEx, C-UL-US and INMETRO Hazardous location Certifications


Penetration assemblies are available for the folding flux probes  being installed on hydrogen cooled machines

Get a Quote

Call us at +1 905.677.4824 or Toll Free at +1 888-873-4747 or fill out our online quote form below.

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Articles, Technical Papers, & Case Studies

Results of Destructive Analysis of Service-Aged Hydrogenerator Stator Winding Insulation

SUMMARY The insulation system in form-wound stator windings is exposed to electrical, mechanical and thermal stresses, in addition to ...



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