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The S-20 seismometer is a three-component velocity output near broad band seismic sensor. The design is based on the electronic velocity feedback which is applied to single coil low period geophone. The frequency bandwidth is extended from 50Hz, down to 20sec.
Two sensor types are provided, a borehole seismometer type and a surface seismometer type.
The borehole type is housed into a 80mm diameter casing while the surface type unit’s diameter is 130mm. The cable length is typically 10 meters. It can be extended to 100 meters or more if required.
No mass-lock or centering is required that makes an easy connection with the digitizer. The settling time of the unit is very short, only one minute. Sensitivity is 1500V/m/sec (differentially) thus providing a very sensitive seismic sensor. A test line is also provided for calibration and testing.
The sensor is ideal for regional earthquake seismology and low frequency grumbling of volcanoes as well as for aftershock studies.
Charactristics:
| General | Surface Type | Borehole Type |
| Number of channels | 3 | 3 |
| Orientation | Vert ical , North-South, East-West | Vert ical , North-South, East-West |
| Supply | 12Vdc (10-18Vdc) | 12Vdc (10-18Vdc) |
| Mount ing | Three adjustable legs | Elastic Packer or Guiding Wheels |
| FEATURES | ||
| Sensi t ivity | 1500 V/m/sec | 1500 V/m/sec |
| Coi l Resistance | 3500 Ohms | 3500 Ohms |
| Damping | 0.7 critical | 0.7 critical |
| Bandwidth | 0.05Hz – 50Hz | 0.05Hz – 50Hz |
| PHYSICAL | ||
| Cable length | Standard 10m | Standard 10m, up to 150m |
| Size (geophone enclosure) | 130mm diameter | 420mm length, 80mm diameter |
| Weight( with 20m cable) | 4.6kg | 4.8kg |
| ENVIRONMEN | ||
| Temperature range | -20 to +70oC | -20 to +70oC |
| Humidi ty | Submersible 5m | Submersible 500m |