SISMA Seismometer
SISMA Seismometer has high performance triaxial with high sensitivity sensors designed for the creation of seismic and microseismic networks.
SISMA 120S
The SISMA 120S is a wideband triaxial seismometer designed for installation in permanent local and national seismic networks.
Rugged design with all internal mechanical controls automated by electronics.
Applications
- Seismic and microseismic networks
- Oil&Gas reservoir monitoring
- Earthquake monitoring
Gas reservoir
Seismic and microseismic networks
Details
The SISMA 120S is compact, reliable and easy to deploy and use; does not require calibration and it is supplied with a calibration certificate with poles and zeros detail. Wide tilt tolerance allows the unit to work within minutes from deployment.
Differential output with high gain and high dynamic range allows the unit to be used with all kinds of seismic digitizers.
The homogeneous architecture of SISMA 120S assures for each UUWV element high quality thanks to the standardized production line. Advanced selection of component materials from aluminum to titanium and special alloys, allows the maximum robustness and thermal stability.
The following diagram shows the noise floor of 0.01 Hz-40Hz sensors.
Differential output with high gain and high dynamic range allows the unit to be used with all kinds of seismic digitizers.
The homogeneous architecture of SISMA 120S assures for each UUWV element high quality thanks to the standardized production line. Advanced selection of component materials from aluminum to titanium and special alloys, allows the maximum robustness and thermal stability.
The following diagram shows the noise floor of 0.01 Hz-40Hz sensors.
Technical Characteristics
| Configuration | U, W, V (output matrix to Z, X, Y) |
| Principle of operation | Coil-magnet force feedback with capacitive transducer |
| Nominal sensitivity | 1500 V/m/s (or other to be specified at order) |
| Velocity output | Selectable X, Y, Z (default) or UVW moe |
| Pass band | From 180-120 seconds to 30-100 Hz (frequency range to be specified at order) |
| Peak output | ± 20V (differential output) |
| Output impendance | 2*100 ohm |
| Mass position output | ± 10V from UVW signals |
| Dynamic range | >148 dB |
| Parasitic resonance | Higher than 140 Hz |
| Calibration input | 1 with axis selection (U, W or V) |
| Power supply input | 9-36 Vdc isolated (U, W or V) |
| Power consumption | <0.5 W typical (1W maximum) @ 12 Vdc |
| Protection | Reverse-voltage protected and self-resetting fuse |
| Calibration coil | 33 ohm |
| Mechanical eigenfreq. | <1 Hz |
| Self noise | < USGS NLNM between 0.025 Hz and 25 Hz |
| Levelling | Manual with lockable paddles, integrated level |
| Maximum allowed tilt | ± 2° from horizontal |
| Operating temperature | -20°C to +70°C |
| Operation range | ±15° without re-centring |
| Storage temperature | -40°C to +80°C |
| Humidity | 0-100% even condensing |
| Protection grade | IP68K |
| Mass centering | Automatic (externally activate) |
| Mass lock | Electric to be activated before transportation |
| Maximum shock allowed | 5G half sine |
| Connector | 26 pin MIL-C-26842 mounted on base |
| Standard cable length | Standard 3 meters |
| Digital interface | RS232 for diagnosis and commands |
| Dimensions | Maximum diameter 240 mm (excluding connector) max height 275 mm |
| Weight | 15 kg |
| Enclosure | Air tight optimized to be insensitive to atmospheric pressure fluctuations, with stainless steel and aluminium treated against corrosion and epoxy painted |
| Regulation compliance | CE |
Gallery