ОKО-22М-EMA ultrasonic flaw detector intended use
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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 steel rods | 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 rod);
- B) detection of groove with a depth 0.5 mm and length 10 mm (EMAT – 45o – 2 MHz, testing the 140 mm rod)
Catalog number | Frequency, MHz | Probe angle, o | Working surface size, mm | Connector type | Connector position |
EMAT0.5-0 | 0.5 0.5 | 0 90 | 20×20 20×20 | 2Lemo00/BNC 2Lemo00/BNC | cable cable |
EMAT1-0 | 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 | 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 | 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 | 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 | up to 20; | |
| Minimum time step between TCG points | up to 1 µs; | |
| Maximum slope | up to 46 dB/µs; | |
GATES | ||
| Two independent gates per channel Amplitude and time measurements | ||
Two levels per gate | ||
| A/D converter | 10 bit, 80 MHz; | |
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. | ||
