ОKО-22М-EMA ultrasonic flaw detector purpose

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

Due to the flaw detector is designed in a form of a standalone device with the connection to the PC via Ethernet port, several EMA channels can be connected to the PC via Switch unit. This allows to create EMA multi-channel 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

Figure 1. – EMA channel "ОКО-22M-EMA"

Figure 2. – Structural scheme for connecting the EMA channels

;
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 a 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.