Metal Magnetic Memory / Eddy Current Tester
EMS-2003, a smart magnetic memory/eddy current detecting
instrument, is a new generation non-destructive testing (NDT)
instrument with advanced microelectronic, computer, magnetic memory
and digital eddy current detecting techniques. The experiment
proves that under the action of the alternative loading, the
normalization phenomenon of the magnetic domain occurs at the
places containing defects and inclusions in in-service
ferromagnetic components, and on it leakage magnetic field arises.
At the places of defects or internal stress relative concentration
the metal magnetic conductivity is in possession of minimum value,
and the tangent component of its magnetic field is in possession of
maximum value, and therefore the sign of the normal component is
changed and its value is zero. When the normal component of
magnetic field on the surface of the component is detected by means
of transducer scanning, the stress concentration areas can be
determined and accordingly the possibility of existing defects in
ferromagnetic components can be indirectly estimated from its. At
the same time the instrument has the digital eddy current detecting
function and can be applied to the detecting of cracks and the
depth of cracks in the weld with anticorrosion layer and its base
material.
With EMS-2003 smart metal magnetic memory/eddy current detecting
instrument a new and quick detecting for stress concentration
caused by material discontinuity (defects) of the equipment in
service will be carried out and early diagnostic results of
equipment fatigue damage given out. The instrument is equipped with
various different shapes of transducers and meters for length
measurement to meet inspection requirements of different shapes of
components and so can be applied to NDT of boiler pressure vessels,
pipes, blades, bearings, rails, gears, welds as well other
ferromagnetic metal components. The magnetic memory/eddy current
detecting function of the instrument can be switched each other
according to detecting requirements at will.
Features
Metal magnetic memory detecting
Measurement channel: 8 channels
Minimum measurable distance: 1mm
Maximum measurable distance: 150mm
Maximum scanning velocity: 0.5m/second
Microprocessor: 16 bits
Memorizer: 16M
Memory capacity: 128M (expandable to 2G)
High bright electroluminescence screen: EL 256x320
Range of operating temperature: -2545℃
Internal power supply: 14.4V 4AH (rechargeable lithium battery)
External power supply: AC 220V
Eddy current detecting
Frequency range: 64 Hz-5 MHz
Gain: 0-90dBstep length: 0.5 dB
Automatic/manual amplitude and phase measure
Non-equal phase/amplitude alarming
Independent storage of detecting programs
Impedance plane and stripe curve displays
Online operation prompt with hotkey help
Parameter、graphic Data can be transferred among
Instruments and microcomputers
Eddy current graphics can be stored、replayed、
analyzed and hard-copied
Selectable background for polar and right coordinate
Parameter storage and recall at will
Automatic calendar and time display