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The SM1500 & SM550 Strong Motion Acceleration Sensors (Accelerometers)

  • 3-axis accelerometers
  • Ultra Low Power Consumption
  • Surface / wall mounting
  • MEMS (Force balance / ASIC technology)
  • DC – 750Hz
  • Wide Dynamic Range 96dB
  • Output range +/-2g to +/-12g linear
  • Noise level 6ugrms/sqrt(Hz)
  • Operating temperature -20 to +70oC
  • Borehole type (optional)
  • 4-20mA current loop output – NEW!

The SM550 and SM1500 are two MEMS type, three-component acceleration sensors. Both have wide frequency response. The SM1500 model provides response from DC to 750Hz, while the SM550 model provides response DC to 50Hz. Many output rages are available for both models like +/-2g, +/-4g, +/-5g, +/-6g, +/-10g, +/-12g, are. Default sensitivity is 2.4V/g for the SM1500, and 1.2V/g for the SM550.

The SM1500 and SM550 accelerometers technology is based on a variable capacitor transducer and a feedback circuit that operates in a closed-loop configuration. The feedback force is controlled by an application-specific integrated circuit (ASIC) which provides high reliability and low output noise.

The SM1500 and SM550 sensors operates from a 12Vdc power supply that can range from 9Vdc to 18Vdc. The typical power consumption is 33mA

Acceleration output is differential analog, swinging between +/-5V. Other output voltages are avialable.

4-20mA current loop output is also available for both sensors

The default cable length between the sensor and the digitizer is approximately 2 meters but it can be extended. The 2-40mA version can have a long connection cable.
The sensors are surface mounted or wall mounted over a provided adjustable base, giving the ability for leveling and orientation.

Seismic accelerometers can be used for early warning systems implementation. The concept is to install high precision accelerometers near seismic zones, generally located occurs at the borders of two tectonic plates.

The interval of time between an earthquake and a local alert can be very small, from one minute to a few seconds. The waves travel through the ground at 1 to 5 kilometers each second, whereas the signals emitted by the sensors reach the urban areas almost instantly. This allows the population to execute the security processes in time, as long as they are not into the blind zone.

Contact GEObit experts to help you on designing your early-warning application.

The GEOtinyAC! compact digital accelerograph

GEOtinyAcc is a compact miniature digital accelerograph which integrates three acceleration channels. Actually is a GEOtiny! seismometer equipped with acceleration sensor. It supports high resolution 24bit digitizer (optional 32bit ADC), embedded linux OS and GPS or NTP timing. Seedlink server ensures reliable real time data telemetry while large storage volume ensures long period local data recording. The instrument has very low power consumption so it can operate getting powered from a small 12Vdc battery.

Design simplicity is the great advantage and it is reflected to the price which is only a fraction of the price of common commercial accelerographs. The sensor delivers superior signal-to-noise ratio and broadband response. The accelerograph communicates through ethernet CAT5 connection or wifi. The user has just to plug the power on and connect with the unit. The devise is compliant with the Los Angeles building code.

  • 3-axis accelerometers
  • Ultra Low Power Consumption
  • Olny 130mm D/ 76mm H
  • MEMS (Force balance / ASIC technology)
  • DC – 750Hz, Wide Dynamic Range 96dB
  • Output range +/-2g to +/-12g linear
  • Noise level 6ugrms/sqrt(Hz)
  • Integrated 24bit digitizer, miniseed data format
  • Local storage, and/or telemetry
  • Integrated seedlink and earthworm servers
  • Web interface, SSH, FTP, SFTP
  • Operating temperature -20 to +70oC
  • Aluminium IP68 case

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