SENDAST 2.5-45
SPECIFICATIONS
| Working wave type | shear | |
| Operating frequency | MHz | 2.5 ± 0.25 |
| Entry angle in steel | ° | 45.0 ± 1 |
| Arrow | mm | 10.5 ± 1 |
| Single delay time | µS | 4.6 ± 0.25 |
| Reserve of sensitivity (according to GOST 14782-86) | dB | Not less 37 |
| Capacity | pF | 1900 ± 200 |
| Piezocrystal | mm | disc Ø12 |
| Internal circuit of correction | Not available | |
| Internal protection against electromagnetic interference and noise | Available | |
| Connector | Lemo series 00 | |
| Overall dimensions (L×W×h) | mm | 37×18×23 ± 1 with horizontal connector 36×18×24 ± 1 with vertical connector |
| Working surface | mm | 27×15 |
| Weight | gr | 22 ± 2 |
| Operating temperature range | °С | Operating temperature range;°С;-20…+90 Allowed time of the continuous contact with subject of control from Т°=180°С is up to 1 minute |
| Средняя наработка до отказа | hr | Not less 1500 |
| Средний путь прохода | m | 8000 |
| -20 dB | -6 dB | -3 dB | ||
|---|---|---|---|---|
| Pulse duration | µS | 1.0 ± 0.15 | 0,59 ± 0,07 | |
| Bandpass range | MHz | 3.2 ± 0.2 | 1.7 ± 0.2 | |
| Bandwidth on -20 dB | % | 130 ± 20 | 70 ± 15 | |
| Directional diagram width | ° | 15.0 ± 1.5 | 7.0 ± 1 | 5.0 ± 0.5 |
MEASUREMENT CONDITIONS
Generator pulse bipolar rectangular one period 100V 0.4µs (the duration corresponds to the period of nominal frequency 2.5 MHz)Pull-up resistor 50 Ohm parallel
The connection cable – wave resistance is 50 Ohms, length is 1 m
Ultrasonic calibration block СО-3: Steel 20, speed of a sound wave is CS=3239m/s CL=5935m/s ТS.TIME DELAYS ALONG THE RADIUS↑↓=33.91 µs ТL.TIME DELAYS ALONG THE RADIUS↑↓=18.50 µs
Ultrasonic calibration block СО-2: Steel 20, speed of a sound wave is CS=3228 m/s CL=5910 m/s
NOTE
Entry angle in steel (according to GOST 14782-86) – is determined on a calibration block СО-2 by reflection from a hole of Ø6 mm at a depth of 44 mm
Sensitivity reserve (in accordance with GOST 14782-86) – the relation signal/noise. The relation of the maximum amplitude of an echo signal in calibration block СО-3 to the peak noise level of the off-load transducer in the range of time of 29 - 39 µS (the interval of time corresponds to a time delay equivalent to CO-3 block radius ± 5 µS)
The pulse-echo duration by level of -6 dB - time interval during which the value of the envelope of the pulse-echo exceeds the level of -6 dB of its maximum value
The pulse-echo duration by level of -20 dB - time interval during which the value of the envelope of the pulse-echo exceeds the level of -20 dB of its maximum value
Bandpass range by the level -6 dB - the difference between the upper and lower cut-off frequency of the amplitude frequency response by the level -6 dB from the maximum value of the amplitude frequency response
Bandpass range by the level -20 dB - the difference between the upper and lower cut-off frequency of the amplitude frequency response by the level -20 dB from the maximum value of the amplitude frequency response
Bandwidth by level of -6 dB is the ratio of the bandpass by the level -6 dB to the frequency of the maximum amplitude frequency response. Expressed in %
Bandwidth by level of -20 dB is the ratio of the bandpass by the level -20 dB to the frequency of the maximum amplitude frequency response. Expressed in %
The average passage way is a resource of transducer rectilinear displacement along the steel surface with a roughness of Rz40, pressure of 1 kg, with applying contact liquid