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ROHMANN Eddy Current Test Equipment and Systems
Since 1977 we have been developing, producing and distributing eddy current testing devices and systems, which are now used worldwide in crack, heat treatment, material confusion and grinding burn testing. Testing solutions for every requirement and every demand. Made in Germany.


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FastSort – fast sorting with 1, 4 or 8 frequencies – optionally with harmonic analysis to determine material properties, hardness differences and/or geometric variations

ELOTEST PL650/R „Remote“ and ELOTEST PL650/RC offer all functionalities without limitations, and are remote controlled via a touch screen or a PC client

Eddy current testing with tolerance band threshold for testing the hardness profile on shafts. The tolerance band threshold uses displacement-based eddy current signals

ELOTEST PL650 with HDR18 and rotating cup probe for crack detection on the bolt head. Industrial high performance rotor (HDR) for testing bores, bolt heads, nuts, etc.

Electromechanical distance compensation precisely controls the distance within a range of maximum 15 mm by positioning the sensor. The distance of the sensor relative to the test part is a decisive factor for the sensitivity in eddy current testing

Various multiplex applications, e.g: Parameter and sensor multiplex for up to 64 virtual mux channels per channel, multiplex rate up to 250 kHz, internal sensor multiplexer for two sensors, control of external sensor multiplexers

Product videos

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Do you have any questions?

Frequently asked questions

What is eddy current testing?

Eddy current testing can be used to check objects made of electrically conductive materials for integrity, composition and tempering condition or also for geometric dimensions. Eddy current testing is based on the physics of electromagnetic fields.

How is eddy current generated?

A current-carrying electrical conductor is surrounded by a circular magnetic field (vortex field). If the straight conductor wire is now wound into a circular conductor loop, the vortex-like field lines overlap in such a way that they form a magnetic dipole (with a north/south pole structure).

What does penetration depth mean?

In principle, eddy current testing can be classified as a surface testing method. Depending on the method, the induced eddy currents are concentrated on a more or less thin layer close to the surface. The strongest eddy currents flow directly at the surface. Therefore, the maximum test sensitivity can be achieved there.

What are probes?

The art of probes development consists in the realisation of a sensor construction that brings the required magnetic field (and thus the eddy current field) to the ‚test location‘ in the workpiece with the required test frequency, in the optimum alignment and required strength, while always minimising undesirable effects as far as possible.

Which probes are used?

Basically, there are two main groups of probes: flow sensors and tactile probes. In the case of through-flow probes, a distinction is made between: External pass-through sensor, which encloses the test object and is guided through it (e.g. rod testing with comprehensive test coils) and internal pass-through sensor, which is enclosed by the test object, i.e. the sensor is guided through the test object (e.g. in internal pipe testing). Pass-through sensors always detect a complete circumferential section of the test object, outside or inside.

What test frequency is needed?

When selecting the test frequency for eddy current testing, consider the specific requirements of the application and the sensor to be used. The recommended frequency range for the sensor should be taken from the manufacturer’s sensor data sheet.

We will gladly advise you

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