Eddy Current Inspection - non-destructive testing

Automated Eddy Current Set

Automated Eddy Current Set

About Eddy Current Inspection

Eddy-Current Inspection is a Non-Destructive Testing method which can be used to detect and quantify surface breaking and near surface defects in materials, components and structures. We can provide tube inspection of non-ferrous tubes and weld & general surface inspection. Our Eddy Current team specialises in tubular heat exchangers and condenser tube inspection and can inspect a wide range of nonferrous material tube ranging from 9.5mm outside diameter to 25.4mm outside diameter (tubes outside of this range can be inspected by prior arrangement). Our team has worked on a wide range of plant in different industries from small tubular heat exchangers (tube nest bundle-90 tubes) to large condensers (tube nest bundle-20,000 tubes) and using the latest automated Eddy Current equipment can inspect between 500 – 700 tubes per day (depending on tube length and tube diameter). We have fully qualified Eddy Current Inspectors holding a minimum of PCN level 2 certification and can work on site or from our Non Destructive Testing workshop in Clevedon, North Somerset UK. All inspections carried out by our staff in a professional and efficient manner and at the end of any inspection work customers will receive a detailed report as to the condition of their plant.


We are accredited and compliant to ISO 9001:2008

<br />We are accredited and compliant to ISO 9001:2008

By using TIS-UK you can be assured of a quality standard of service that meets statutory and regulatory requirements.

Eddy current testing equipment

Eddy current testing equipment

Eddy-Current Non-Destructive Testing (basic principle)

  • A coil is energised by an AC current
  • The coil is then positioned in close proximity to the test specimen, which must be an electrically-conducting material
  • The current in the coil generates a magnetic field
  • This field induces currents to flow in the test specimen
  • These currents (the "eddy-currents") generate their own magnetic field. This field interacts with the original field
  • Changes in the field, due to the presence of defects etc, cause changes to the coil's impedance
  • These changes appear on the display of the eddy-current test set as "defect signals"
  • The nature of these signals allows judgements to be made on the nature and origin of the source of the signals, ie the defects.
Eddy current testing - tubes

Eddy current testing - tubes

Eddy-Current Non-Destructive Testing - Tubes (basic principle)

  • The basic technique involves passing a probe along the full length of each tube to be tested
  • The probe contains coils that form two arms of an AC impedance bridge circuit
  • The eddy-current system is initially "balanced" in a reference tube containing known reference "defects", where sensitivities are set and system calibration is carried out
  • The probe is then passed along the full lengths of each tube to be tested. Any metal loss, thinning, dents etc. will unbalance the circuit and cause a defect signal to be generated
  • This signal is analysed thus enabling the nature and severity of each defect to be displayed

Contact TIS UK Ltd today for a FREE quotation.

Telephone us now on 01275 871130 or email us.