OKO EMA testing

 

ОKО-22М-EMA ultrasonic flaw detector intended use

 

The ОКО-22М-EMA ultrasonic flaw detector is an independent electronic device and is designed for application in stationary, high-performance systems (automated multichannel NDT Systems), transportable systems (mechanized NDT systems), or for manual testing.

 

As the flaw detector is a standalone device connected to a PC via Ethernet port, several EMA channels can be connected to the PC via the Switch unit. This allows creating EMA multichannel testing systems.

 

APPLICATION OF EMA TESTING TECHNIQUE IN VARIOUS INDUSTRIES:

 

Production sector, test object

Regulatory Documentation

Required number of channels

Operating frequency, MHz

Special requirements

Metallurgy, testing the flat rolled steel

EN10160, ASTM 578/A578M-96, A435A, ISO 12094

60 -100

2-3

Test object temperature can reach to 650 oС

Metallurgy, testing the rolled round steel bars

EN 10308, EN 10228-3, ASTM E – 2375, MS-STD – 2154

3-20

2-4

Operating gap is 1 mm, testing velocity is up to 2 m/s

Metallurgy, testing the slabs

-

48-160

0,5; 2; 4;

Operating gap is 0.3-1 mm, testing velocity is up to 2 m/s

Engineering, testing the pipe welded joints

API 5L, API 5 CT, EN 10246-17

12

2 - 4

Operating gap is 1 mm, velocity is up to 1 m/s

Engineering, testing the pipe body, thickness gauging

API 5L, API 5CT, EN 10246, ASTM E1816-96

56

2 - 4

Operating gap is 1 mm, velocity is up to 1 m/s

 

EMA channel OKO-22M-EMA electro-magnetic acoustic flaw detector

Figure 1. – EMA channel "ОКО-22M-EMA"

 

Structural scheme for connecting the EMA channels

Figure 2. – Structural scheme for connecting the EMA channels

 
OKO-22M-EMA electro-magnetic acoustic flaw detector detection of flat-bottom hole OKO-22M-EMA electro-magnetic acoustic flaw detector detection of groove with a depth 0.5mm and length 10mm;
А) B)

Figure 3

 
  • А) detection of flat-bottom hole with dia. 2 mm at a depth 136 mm (EMAT - 0o - 4 MHz, testing the 140 mm bar);
  • B) detection of groove with a depth 0.5 mm and length 10 mm (EMAT - 45o - 2 MHz, testing the 140 mm bar)
 

Catalog number

Frequency, MHz

Probe angle, o

Working surface size, mm

Connector type

Connector position

EMAT0.5-0
EMAT0.5-90

0.5
0.5

0
90

20×20
20×20

2Lemo00/BNC
2Lemo00/BNC

cable
cable

EMAT1-0
EMAT1-45

1.0
1.0

0
45

20×20
20×20

2Lemo00/BNC
2Lemo00/BNC

cable
cable

EMAT1-90

1.0

90

20×20

2Lemo00/BNC

cable

EMAT2-0
EMAT2-45
EMAT2-90

2.0
2.0
2.0

0
45
90

20×20
20×20
20×20

2Lemo00/BNC
2Lemo00/BNC
2Lemo00/BNC

cable
cable
cable

EMAT4-0
EMAT4-45
EMAT4-90

4.0
4.0
4.0

0
45
90

20×20
20×20
20×20

2Lemo00/BNC
2Lemo00/BNC
2Lemo00/BNC

cable
cable
cable

EMAT5-0

5.0

0

20×20

2Lemo00/BNC

cable

EMAT5-45

5.0

45

20×20

2Lemo00/BNC

cable

EMAT6-0

6.0

0

20×20

2Lemo00/BNC

cable

EMAT8-0 8.0 0 20×20 2Lemo00/BNC cable

*Working surface size and dimensions of EMA transducers can be performed at our Customer`s request. Available high temperature EMAT modification.

Figure 4. EMA transducers

 

Parameter

Value

PULSER

Initial pulse filling frequency
(Selection of a frequency filling is determined by the testing task. Available 2 channels with different frequences);

0.5, 1, 2, 3, 4, 5, 6, 8 MHz;

(up to 8 MHz available as an extra option)

Type of initial pulse

Toneburst Waveform;

Number of periods

2-6;

Pulser amplitude

up to 2000 Vpp;

Pulse energy

depends on a filling frequency;

Pulse repetition frequency (PRF)

from 50 to 4000 Hz;

RECEIVER

Gain adjustment

-20 to 68 dB (gain step 0.1, 0.5, 1, 2 dB);

Filter

0.5, 1, 2, 3, 4, 5, 6 MHz;

Delay

from 0 to 1000 mm in steel (sound velocity 3230 m/s);

Range

from 1 tо 6000 mm in steel (sound velocity 3230 m/s);

Number of averages

2 / 4 / 8 / 16 / 32;

Data presentation

А- Scan; B-Scan; C-Scan;

TCG

Depth

entire gain range;

Number of points

not less than 20;

Minimum time step between TCG points

up to 1 µs;

Maximum slope

not less than 46 dB/µs;

GATES

Two independent gates per channel Amplitude and time measurements

Two acceptance levels per gate

A/D converter

10 bit, 80 MHz;

PORTS

(for communication with PC and various peripheral devices)

Ethernet (for communication with PC);

CONNECTORS

2 lemo00 connectors for connecting the EMAT to the receiver of EMA channel;

2 BNC connectors (one connector for the first pulser, second connector for the second pulser).

1 lemo connector for Encoder connection;

1 power connector;

1 Ethernet connector for transmitting the data to PC;

1 Trigger connector is used either for synchronization between EMA channels, or for EMA channel metrological verification.

 

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"OKOndt GROUP™" represents a group of companies with more than 25-year experience in research, development and manufacture of NDT products for industrial clients all over the world, who endeavor to ensure high-level operational safety, quality, and reliability.

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