NFT Bobbin Probes
NFT Bobbin Probes use near-field eddy currents to detect inner-diameter damage in carbon-steel tubing, including fin-fan air cooler tubes.
Product overview
NFT Bobbin Probes are near-field testing probes intended primarily for detecting corrosion, erosion, pitting, and axial cracking on the inside diameter of carbon-steel tubing. Typical inspection targets include tubes in fin-fan air coolers.
The NFT method typically places a receiver coil close to the transmitter coil, using the transmitter’s near zone where directly induced eddy currents are strong. This arrangement also provides good sensitivity to defects near tubesheets and support plates.
The probes feature highly kink-resistant cables and 19-pin Amphenol connectors. Stainless-steel sleeves increase body durability for probe diameters up to and including 20 mm (0.79 in); the page also describes sleeveless, lightweight advanced-polymer bodies from this diameter upward.
Key capabilities
Inner-diameter defect detection
NFT is particularly suited to corrosion, erosion, pitting, and axial cracking on the inside diameter of carbon-steel tubing.
Sensitivity near structures
The method provides good sensitivity to defects close to tubesheets and support plates.
Kink-resistant cable
A highly kink-resistant cable supports probe durability.
Amphenol connector
The probes feature a 19-pin Amphenol connector.
Diameter-dependent body construction
The family uses stainless-steel-sleeved bodies for smaller diameters and sleeveless advanced-polymer bodies for larger diameters.
Published technical specifications
Values as published by Eddyfi Technologies. Where models or variants differ, each is listed separately.
Connection
- Connector
- 19-pin Amphenol connector
Probe body
- Stainless-steel sleeve diameter limit
- up to probe diameters of 20 mm (0.79 in), inclusively
- Sleeveless advanced-polymer construction threshold
- From this diameter up
- Highly kink-resistant cable
- 19-pin Amphenol connector
- NFT is best suited to inside-diameter defects in carbon-steel tubing.
- The body-construction descriptions overlap at 20 mm (0.79 in): stainless-steel sleeves are specified up to this diameter inclusively, while sleeveless advanced-polymer bodies are described as starting from this diameter.
Official brochures
Tubing Probe Catalog
Additional documents
Other Eddyfi products
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CompareHow EMUS supports this
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Mechanical, electrical, environmental setup done right the first time.
Qualification and acceptance testing against real criteria.
Operator and application training built around your parts.
Traceable calibration to keep measurements audit-ready.
Preventive and corrective service across the Balkan region.
Method development and problem-solving with our engineers.
Eddyfi Technologies
Part of the Eddyfi Technologies portfolio, represented by EMUS across the Balkan region.
Application Notes & resources
Official application notes and technical literature for NFT Bobbin Probes.
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