What size defects can be detected?
By applying the rule of one measurement location (Thermal Wire® cable or CSL-type access tubes) in the cross section for each foot (300 mm) of shaft diameter, the zone of detection becomes dependent on the anomaly's size. Multiple tubes or Thermal Wire cables can detect larger anomalies. Closer cables or access tubes can detect smaller anomalies. Generally, Thermal Wire cables or access tubes can detect a 10% cross section anomaly. Otherwise, defects of 5% of the cross section are easy to find.