SENDAST 5.0-70
SPECIFICATIONS
| Working wave type | shear | |
| Operating frequency | MHz | 5.0 ± 0,5 |
| Entry angle in steel | ° | 70.0 ± 1 |
| Arrow | mm | 6.5 ± 1 |
| Single delay time | µS | 3.0 ± 0.25 |
| Reserve of sensitivity (according to GOST 14782-86) | dB | Not less 55 |
| Capacity | pF | 650 ± 100 |
| Piezocrystal | mm | disc Ø6 |
| Internal circuit of correction | Not available | |
| Internal protection against electromagnetic interference and noise | Available | |
| Connector | Lemo series 00 | |
| Overall dimensions (L×W×h) | mm | 32×13×21 ± 1 with horizontal connector 31×13×22 ± 1 with vertical connector |
| Working surface | mm | 22×11 |
| Weight | gr | 12 ± 2 |
| Operating temperature range | °С | -30…+90 °С. Allowed time of the continuous contact with subject of control from Т°=180°С is up to 1 minute |
| The average time to failure | hr | Not less 1500 |
| The average passage way | m | 8000 |
| -20 dB | -6 dB | -3 dB | ||
|---|---|---|---|---|
| Pulse duration | µS | 0.55 ± 0.08 | 0.29 ± 0.04 | |
| Bandpass range | MHz | 6.0 ± 0.6 | 2.7 ± 0.3 | |
| Bandwidth | % | 120 ± 20 | 60 ± 15 | |
| Directionla diagram width | ° | 26.0 ± 1.5 | 14.0 ± 1 | 10.0 ± 0.5 |
MEASUREMENT CONDITIONS
Generator pulse bipolar rectangular one period 100V 0,2µs (the duration corresponds to the period of nominal frequency 5,0 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 15 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 valu
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