S100 Seismometer

The S-100 wide band seismic sensor

3-axis Wide Band Response (0.2-98Hz) seismic sensor Designed according the Force-Balance principle High Sensitivity 1000 V/m/sec, velocity output, Ultra low power consumption. Borehole Type, 50mm diameter, elastic packer mounting. Typical 20m cable length, optional up to 200m Build-in Self test function.

The S-100 is a three-component velocity equivalent output seismic sensor. The design is based on the force-balance principle, thus using three simple geophone elements with natural frequency 4.5Hz the frequency bandwidth is extended from 90Hz, down to 0.2Hz. The default cable length between the sensor body and the electronics box is approximately 20 meters but it can be extended up to100 meters. The geophones are housed in the same 50mm body producing a solid waterproof sensor suitable for installation into boreholes where the noise is much less than the surface. The geophones are orientated according the 3-axes principle. A dot mark, incised on the plastic cover of the case, indicates the direction of the North. Optionally, surface mount installation is available.

The sensor is totally controlled by an advanced signal conditioner circuit which supplies current to the geophones forcing them to a constant vibration at different frequencies. The signal conditioner circuit is fully protected against over voltage, opposite power supply polarity and lightning inductive currents. When inactive, it enters the "power-off" mode in order to reduce power consumption of the system.