Elotest HST Heavy Plate Hard Spot Tester

During steel production occasionally local hardening may occur on the surfaces of semi-finished products (e.g. heavy plates). In the further processing and later use of the finished products (e.g. longitudinal seam-welded tubes), this hardening (also called as "hard spots") can cause problems or lead to component failure. Thus relevant specifications increasingly require an in-process hardness testing of surfaces. In the past hardness measurements had been performed only on a sample basis, commonly using "destructive" methods combined with lab analysis. Due to the increasing call for an extensive surface testing of semi-finished products, Rohmann GmbH developed a new test method (EDDY+), which had been applied for a patent.



  • Eddy+: evaluation of the eddy current response to a magnetizing pulse
  • easy signal interpretation concerning mechanical hardness values
  • low susceptibility to disturbing effects (e.g. mill scale)
  • suitable für high test speeds (up to 1 m/s)
  • inspection trolley for the manual testing of large semi-finished flat products such as heavy plates
  • integrated battery pack
  • array of Eddy+ special probes, manual lifting and lowering
  • 19″ eddy current instrument (e.g. PL600)
  • external PC with ScanAlyzer software for data recording, evaluation and documentation (option)
  • encoder for way-based data recording (option)
  • visualization of test results by means of a 3-colour signal column (“traffic lights”)
  • robust design (welded stainless steel frame)
  • inspection time up to 5 hrs (quick-change battery pack, quickly rechargeable battery)
  • easy manoeuvring (3-wheel carriage)

System Data

  • max. configuration level (eddy current instrument): 12 test channels
  • max. 8 multi-coil probes (arrays), each with up to 8 coils per test channel
  • wear protection underneath the Eddy+ arrays
  • measuring grid: down to 10 mm (0.4 “) in transverse direction
  • max. test width: 500 mm (~ 20″)
  • weight: approx. 90 kg / 199 lbs  (incl. battery pack)
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Dillinger manufactures technologically outstanding and versatile heavy plates at the traditional Saar location. References in a wide variety of application areas are available worldwide. Especially for pipeline applications, the HST test procedure developed by ROHMANN supports the precision and consistently high quality of Dillinger products. Dillinger Hütte

Eisenwerk Brühl GmbH specializes in the development and mass production of cast iron engine blocks for the automotive industry. The company is one of the most important suppliers of cast iron ZKG for the passenger car sector. To secure the production process, i.e. for the detection of material defects, hand and line testing devices from ROHMANN are used. Eisenwerk Brühl GmbH

As a subsidiary of the Etihad Aviation Group, the company offers services in the areas of line, light and heavy maintenance. The largest service provider for commercial aircraft in the field of maintenance, repair and operation in the Middle East, uses both the ELOTEST M2 handheld tester and the ELOWHEEL 1000 rim tester (RPT16) for inspecting their aircrafts. Etihad Airways Engineering

Stüken is the world market leader for deep-drawn components, punch and deflection parts of maximum precision and reliably high quality. For automated quality assurance, i.e. for the detection of material and structure defects, Stüken uses line testing equipment, e.g. the ELOTEST PL600 from ROHMANN. Hubert Stüken GmbH & Co. KG

Lufthansa Technik offers a complete service for aircraft technical services, such as maintenance, overhaul and testing of engines and chassis. In addition to the robot-based ELOSCAN test systems, Lufthansa Technik AG also uses sensors and portable test equipment from ROHMANN at several locations in Germany. Lufthansa Technik AG

NKT is a well-established and global supplier of turnkey DC and AC cable systems, providing world-class energy transport with innovative cable solutions. To ensure the quality of its own products, NKT uses the line tester ELOTEST IS500 from ROHMANN. NKT Group GmbH

Siemens Power Generation Services provides worldwide service solutions for gas or steam turbines, generators or wind turbines to increase the efficiency, reliability and operational flexibility of plants. In its global maintenance services, the company uses a.o. the ROHMANN handheld tester ELOTEST M3. Siemens

As a traditional aviation manufacturing and maintenance company, Zeppelin offers professional QM services to the global aviation industry, the automotive industry and mechanical and plant engineering. For the aerospace sector, Zeppelin carries out ZFP training courses using ROHMANN handheld testers Elotest M3, test probes and calibration standards. Zeppelin Systems GmbH

ZF is a leading global technology group in driveline and chassis technology as well as active and passive safety technology. ZF uses a wide range of innovative solutions from ROHMANN for various testing tasks in the field of crack and structural testing. ZF Friedrichshafen AG