Votum

"Tomographic 1.2." provides simultaneously the features of EMA (electromagnetic acoustic) and ultrasonic precision thickness gauges.

EMA (US) thickness gauge is applied at oil, chemical and gas industry enterprises, shipyards, repair and maintenance bases for residual thickness gauging of parts and metal constructions.


The EMA method advantage is provided by its physical characteristics. It enables to test objects without any contact liquid and to work with materials, having dirty surface (rust, corrosion, etc.) and paint-and-lacquer coatings.


Stable operation of the EMA transducer is provided at air clearance with tested surface (0...1.5 mm), depending on electroconductivity of the tested material.


Several types of transducers are used for thickness gauging:
• EMAT – single
• EMAT – dual
• Transducer – single
• Transducer– dual


EMA/US thickness gauge uses three ultrasonic testing methods: resonance method, correlation method and pulse method. It is recommended to carry out the specimen calibration for each method (for thickness or ultrasonic wave propagation velocity in the specimen).


Resonance gauge method is used for especially thin objects where high accuracy rating is required:

• from 0,2 mm to 1 mm (Transducer)
• from 0,3 mm to 0,7 mm (EMAT)


Correlation gauge method is used if at least two backwall echo signals are available (the error is decreased if the number of echo signals is increased). This method is intended to be used in the average ranges:

• from 1 mm to 60 mm(Transducer)
• from 0.7 mm to 60 mm (EMAT)


Pulse gauge  method is used with one backwall signal and is intended for evaluating thickness gauging in the ranges:

• from 10 mm to 4800 mm (Transducer)
• from 5 mm to 650 mm (EMAT)

The program  provides the user with new features, allowing to facilitate considerably the operator's work and accelerate the testing process. These features include:

• Automatic determination of the contact between the transducer (Transducer or EMAT) and testing surface. There is also a possibility to turn on/off this feature;
• In the correlation and pulse methods, the semiautomatic (manual adjustment) and automatic settings are available. It allows to start testing without presetting of the device. Among other features, the pulse method also provides the automatic determination of the 1 echo pulse position. This features can be also activated and deactivated;
• A-scan+B-scan allow to track visually the admissible thickness error. DAC indicator of the device signalizes if an inadmissible deviation occurs;
• Automatic gain control makes unnecessary to set constantly the necessary value when a testing object is changed. Manual setting is also available to make usage more convenient; 
• Along with the table representation of results, a thickness chart is implemented, allowing to evaluate the testing object in whole; its graphic representation displays visually the zones of inadmissible thickness deviations; 
• Settings archive allows to store and download  any necessary  setting. Settings archive can contain 1000 records;
• Results archive allows to store and download any necessary record and view it on the device screen. It also allows to form a testing report.

 Documentation of testing results is carried out via universal application software Operator's workbench.