The ELOTEST\HST 3 testing trolley is used for the detection of partial hardening spots on heavy plates. The ELOTEST HST-3 is designed for manual testing of large-areas on semi-finished products using the EDDY+ method. The test signals of the integrated ELOTEST\PL650 R eddy current tester are directly displayed as a C-Scan on the fully robust mobile PC (Panasonic Toughbook) included in the scope of delivery. The recorded data can be immediately evaluated and documented here. The system status is additionally visualized to the operator via clearly visible signal lamps. This makes the ELOTEST HST-3 mobile inspection system predestined for use in harsh steel mill environments. Two powerful and exchangeable lithium-ion rechargeable batteries make the test system suitable for up to 20 hours of use independent of mains power.
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Two hardware testing channels in the ELOTEST\PL650 R and two external multiplexers to connected 4 probes each
Panasonic Semi Ruggedized 14“-TOUGHBOOK 54 HD with ScanAlyzer 7 evaluation software
10 hours testing time per battery pack applies to the trolley and the mobile PC with a second battery pack
Eight probes, each with 8 integrated sensors, robust and wear-resistant zirconium oxide industrial ceramic soles on the probe
100% testing area coverage of 640 mm, test speed up to 1m/s (corresponds to normal step speed)
Two mutually independent, replaceable high-performance lithium-ion battery packs, can be switched during operation
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.
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).
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.
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.
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.
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.