Research is an investment in the future

All our developments are achieved through the implementation of scientific innovations based on application-oriented research. For each application it is our goal to develop solutions that guarantee improvements in the performance, speed and efficiency of testing systems. As such, we also actively contribute to the determination of international standards and guidelines.

EMDC technology – precise test results for all parts

With the EMDC (electromechanical distance compensation) technology we have developed, even the most difficult testing tasks can be easily solved. Regardless whether it is non-circular parts, hard-to-center parts, parts with complex geometries, or generally parts presenting concentricity problems: the distance between the probe and the product to be tested is controlled electromechanically. So even in cases where distance fluctuations are considerable, measurement sensitivity is consistently high and virtually perfect compensation is assured. Combined with the ELOTEST PL600, you are guaranteed a testing system with the highest in flexibility.

The Eddy+ testing method – heavy plate hard spot testing from ROHMANN

ROHMANN ELOTEST PL500

In the steel production process increased local hardening may occasionally occur on the surfaces of semi-finished products, which can result in problems that range from difficulties in further processing to component failure. A development of ours, the Eddy+ method, provides reliable and non-destructive inspections for increased surface hardness, quickly and easily detecting hardness differences. For this, specially developed hardware and software and a special probe perform a partial reversal of magnetization with a bipolar magnetization pulse, while the actual eddy current probe measures the associated permeability change. The advantage of our method is that disruptive interference is eliminated for conventional eddy current testing (caused by a rolling skin, for example) but it is still possible to achieve quite high testing speeds of 1m/s. This new testing method, too, has been registered for a patent.

Way-based filters – reliability at every testing speed

Varying speeds and fixed filter settings in testing often lead to problems in the detection of defects. This is where our way-based filters can help, such as those offered by ROHMANN’s ELOTEST PL600, which delivers reliable test results even to a complete standstill, guaranteeing speed-independent testing with consistent signal quality. This means that the material must not be tested again in the event of a standstill, and testing can be continued right away.

Electronics are the core of our testing systems


In daily use, the electronics in eddy current testing systems must satisfy extreme demands on precision, dynamics and ruggedness in the measuring sequence between probe and signal evaluation. ROHMANN uses state-of-the-art components to produce sophisticated electronic functional modules, which are built according to exacting specifications on powerful CAD systems, inspected in accordance with our own strict guidelines, and seamlessly documented. The use of digital technology here makes it easier to perform complete simulations of electronic modules and allows an integrated check of functionality, automated alignment and the computer-based calibration of our products.

Software is the life of our testing systems

Today, software can be used to program every level of modern electronics systems. Their programmability is the reason our electronics systems are so powerful and flexible. ROHMANN has a highly qualified team of experienced specialists for all programming tasks. We also have a comprehensive portfolio of programming systems and development tools, ranging from assembler to complex high-level languages, from CAD-based development systems for electronics and mechanics, to tools for graphic-oriented programming of custom solutions for specific applications. With ROHMANN software, testing instruments are more powerful, smaller, and less costly, making it easier to implement customer-specific solutions.

Mechanics are the locomotor system of our testing systems.

From the simplest mechanical guidance tool to automatic inspection mechanics and robot-based handling systems – at ROHMANN, any level of mechanical system can be realized. To achieve the highest accuracy and consistent quality, ROHMANN always uses precise CNC technology to produce its probes and mechanical systems. To ensure that these high standards are met, ROHMANN regularly performs mechanical and electronic calibrations in compliance with national and international standards, and has specifically introduced its own internal calibration system to accomplish this.

Sensor technology is the eyesight of our testing systems.

In the material to be tested sensors register eddy-current signals, so they are the first decisive link in an entire measuring sequence. The measuring sequence can only process that which has first been recorded by the sensor systems. So, sensor technology with excellent “eyesight” is indispensable. All ROHMAN probes are optimized to detect physical effects or defects, but they also meet all requirements related to the material, geometry and complexity of the test specimen’s composition. For this ROHMANN has developed advanced probes, many of which have become the global standard today.

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

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Dr. Aschwin Gopalan Head of R&D at ROHMANN