EMAT Ultrasonic Thickness Gage

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Product Description

As an Authorized dealer we are engaged in providingthe broad assortment of wide gamut of NDT Instruments.

This is a portable electromagnetic ultrasonic (abbr. as EMAT )thickness gauge to be used without couplant or direct contact on materials ofmetal or magnetism, based on electromagnetic-acoustic transduction.

The main difference of this technology is that the ultrasonic waveis generated directly in the tested object.

The principle of the action of EMA transducers is based on theexcitation and reception of ultrasonic waves by induction on the surface of anelectrically conductive object of alternating and constant magnetic fields. TheEMAT inductor, through which a high-frequency current pulse flows, creates aneddy current in the surface layer of the metal. As a result of the combinedeffect of the eddy current and the polarizing field, Lorentz forces arise,which ensure the excitation of ultrasonic oscillations of the correspondingtype. Depending on the design parameters of the inductor and the orientation ofthe polarizing field, shear SH waves of radial or linear polarization (an ovalor rectangular inductor) are excited during the monitoring process.

Due to naffectedness by surface of the object, it can be appliedto those with rust, oxide layer or coating, like oil pipe or aircraft parts,saving the effort to clear them off. Angle shift of the probe has no effect onthe result, with the available gauge range 2~300mm and the precision up to 0.01mm.This instrument can also work on hot objects such as forged pieces, radiatorsand heat exchangers, assisted by necessary kittings supplied by the manufacturer.There're optional functionalities like B-Scan, RS-485 BUS networking, GPRSwireless communicating and SMS for the users to realize their modern dreams onNDT instruments.

Areas of Application

Metallurgy
Aerospace
Pressure Vessel
Thermal Circulation
Shipbuilding
Machinery
Construction
Power Generation
Nuclear Power
Refrigeration

Purposes

To gauge thickness of metal ormagnetic objects with rough surface that might cause poor coupling for pureultrasonic transduction
To get precise thickness dataof metal part beneath coated layer, such as rust, oxide or artificial coatingmaterial. Oil pipes, aircraft parts
To work under special situation that there's air gap or some obstacle stuck between the transducerand the metal object.
As an solution to thickness gauging on objects of high temperature without loss of data and damage to thetools (transducers & instrument) and the operator forged pieces, radiators, heat exchangers (up to 300 at-and-away: up to 600)
to make the job of gauging go on under severely cold weather (lowest to -40)

EMAT Transducer

The is kitted with an EMAT probe (2MHZ, but can be customized to different specification)that can induce eddy current as to generate ultrasonic wave on the surface of ametal or magnetic object by permanent magnet and electrified coil. Strongconstitution by solid casing and temp-insensitive element enables this transducerto function over harsh conditions like coarse-textured interface and extremeclimate (kitted with heat-proof probe cable).

Specification

Standard	EN 12668-1 compliance
Measuring range	1.0 - 300.0mm
Temperature range of work pieces	-40-300
Display	4.3" industrial-leveled TFT color LCD with 800 x 480 WVGA resolution
Excitation Pulse Intensity	350 Vpp
Sampling Frequency / Bits	160MHz/10Bit
Bandwidth Range	300kHz x 5MHz
Rectification	Positive half wave, negative half wave, full wave and RF
Range Adjustment Step	1mm (Transverse wave)
Gain	Total attenuation of 110dB, step as 0.1, 2.0 and 6.0
Distance from test object	3mm
Horizontal Linearity Error	0.4%
Dynamic Range	30dB
Excitation Mode	permanent magnet
Weigh	1.0kg
Power Supply	Large-capacity lithium battery without memory effect, more than 8 hours