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, |
|
Metallurgy, testing the slabs |
- |
48-160 |
0,5; 2; 4; |
Operating gap |
|
Engineering, testing the pipe welded joints |
API 5L, API 5 CT, EN 10246-17 |
12 |
2 - 4 |
Operating gap is 1 mm, |
|
Engineering, testing the pipe body, thickness gauging |
API 5L, API 5CT, EN 10246, ASTM E1816-96 |
56 |
2 - 4 |
Operating gap is 1 mm, |
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 |
0.5 |
0 |
20×20 |
2Lemo00/BNC |
cable |
|
EMAT1-0 |
1.0 |
0 |
20×20 |
2Lemo00/BNC |
cable |
|
EMAT1-90 |
1.0 |
90 |
20×20 |
2Lemo00/BNC |
cable |
|
EMAT2-0 |
2.0 |
0 |
20×20 |
2Lemo00/BNC |
cable |
|
EMAT4-0 |
4.0 |
0 |
20×20 |
2Lemo00/BNC |
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
THE ОКО-22М-EМА MAIN SPECIFICATIONS
| Parameter | OKO-22M-EMA V.2 | OKO-22-M-EMA PRO |
| 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. Selection of a frequency filling is determined by the testing task) |
|
| Type of initial pulse | Toneburst Waveform | |
| Number of periods | 2-6 | |
| Pulser amplitude | up to 4000 Vpp | |
| Pulse energy | depends on a filling frequency | |
| Pulse repetition frequency (PRF) | from 50 to 1000 Hz | from 50 to 2000 Hz |
| Receiver | ||
| Gain adjustment | — 28 dB to 68 dB (gain step 0.1, 0.5, 1, 2 dB) | |
| Filter | 0.5, 1, 2, 3, 4, 5, 6, MHz; (Selection of the filter frequency is determined by the testing task.) |
|
| Delay |
from 0 to 1000 mm in steel (sound velocity 3230 m/s) |
|
| Range | from 0 to 1000 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 | ||
| Ethernet | + | |
| 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 | ||
| IP level | ||
| Ingress Protect Rating | IP65 | IP44 |