Specification

Eddydector crack detectors are eddy current instruments specifically developed to test components for surface cracks, either prior to, or after, grinding, machining or other production sequences. The eddydector’ s principle of operation is based on the environmentally clean eddy current test method. Cracks as small as 0.05 mm in depth can be detected in components parts with predominately round finished surfaces. The signal amplitude varies according to the depth of the crack; however, the effects of alloying and surface conditions will determine crack detection ability.

The system is capable of testing with eight probes at a time. Each of the plug-in test channels is an independent, individually adjustable eddy current instrument, which makes it possible to provide a complete compact test station for multi-point inspection of camshafts, valves, etc. using just the one handy instrument.

The output signals of each channel are transferred in analog form ( X and Y) to an oscilloscope or a printer. Defect signals are passed on via opto-interface to a control system ( or PLC) operating marking or sorting mechanism. Each test channel has its own bar graph display for crack signals. Defect signals remain stored until reset by either an external “ Quit� signal or by manual operation of the “ Quit� touch key. An extremely rapid inhibit signal allows reliable crack detection very close to the bored holes, where normally such cracks would be concealed by the borehole signal.

Damaged eddy current probes or cable are instantly recognized by a special probe-failure supervision feature. An inbuilt overload sensor prevents incorrect setting of the system. Despite the versatile possibilities, the eddydector is extremely easy to handle and operate, and adjustments are very simple and easy to carry out.