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Destination:
Measuring of vibration and shock accelerations of objects being under high humidity conditions or under water at depth of up to 50 meters.Features:
Piezoelement operation shear circuit. Combination of small overall dimensions and acceptable sensitivity. Strong structure and hermetically sealed body. Stability of characteristics and operational reliability.
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Parameter | Unit | SD78 | SD79 |
Axial sensitivity (± 20 %) | pC/g*1 | 10 | 2 |
Relative transverse sensitivity | % | < 3 | < 5 |
Amplitude range | g*1 | ± 5 000 | ± 2 500 |
Max.shock limit (peak value) | g*1 | ± 10 000 | ± 5 000 |
Operating temperature range | °C | - 60+ 150 | |
Frequency range (ripple ± 1dB) | Hz | 0.515 000 | |
Self-resonant frequency in attached condition | kHz | > 45 | > 50 |
Strain sensitivity | g·m/µm | < 0.005 | < 0.000 5 |
Capacitance | pF | 1 000 | |
Insulation resistance in normal conditions |
| > 10 000 | |
Maximum pressure (equivalent depth 50 m) | Pa | 5·105 | |
Piezoelectric material | - | 19 | |
Design | - | Shear | |
Bottom insulation | - | no | |
Built-in cable length | m | 2*2 | |
Housing material | - | titanium alloy (stainless steel)*2 | |
Weight (without connector and cable) | gram | 10 (13) | 6 (9) |
Suplied accessories | - | stud | screw 3×20,washer Ø 3 mm,spring washer |
General view of SD78 |
| General view of SD79 | |||
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Electrical circuit ofSD78 |
| Electrical circuit ofSD79 | |||
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Additional order accessories:
calibrators ; charge amplifiers , ; measuring amplifiers ; adapter box (in set with charge amplifier ); cables ; connector adapters ; wax for mounting ; magnet mounting bases ; stud ; insulating stud .*1 - 1g = 9.807 m·s-2 or 10 m·s-2 = 1.02 g;*2 - to be determined when making out an order.
Underwater Vibration Transducers SD78, SD79