SIGMA Standard

SIGMA Standard

Product Overview

With a flat frequency passband from DC to 400Hz the SIGMA is a force balance accelerometer with one of the widest frequency responses currently on the market. It comes with four remotely configurable saturation levels between +/- 4g and +/- 0.5g. The SIGMA accelerometers are very easy to install. A single point slotted base bolt  ensures that the sensor will be fixed firmly to the installation point. Three levelling feet ensure that the sensor is levelled and locked to the installation bolt.

The unique design of the connector turret allows easy connection to the sensor. All the connectors are waterproof with O-ring seals to a water depth of up to 2 meters.

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SIGMA Standard

Key Features

Instrument Design

- Classical orthogonal sensor topology with sensor axes pointing in the three cardinal directions.

- Fine pitched adjustable feet manufactured from brass.

- All sensor components are made of non-magnetic materials, minimizing noise induced by outside magntic fields.

- Single slotted base fixing point

Instrument Characteristics

- Flat frequency response from DC to 400 Hz.

- Four remotely configurable saturation levels between +/- 4g and +/- 0.5g.

- Other options down to +/- 0.05 g available.

- Dynamic range at +/- 2g >170 dB, at +/- 4g >167 dB

- Operational range within +/- 10.0 degrees of tilt.

- Cross axis rejection >-70 dB.

- Operating temperature range: -20 to 75 deg C.


- Rugged housing made from hard anodized aluminium.

- Weight 2.38 kg.

- Dimensions: outer diameter 14 cm, height 12.5 cm

- Waterproof as per IP68 standard.

 Power and Electronics

- Power consumption 490 Milliwatt at 12 V

- Power operating range from 9 to 36 Volt.

- The sensor's electronic circuitry is galvanically isolated, protected against polarity switch and voltage transients.

To obtain a detailed data sheet for this seismometer, please contact Gaiacode Headquarters

 Disclaimer: The product specifications and the stated data are subject to change without prior notice.

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  • Ref 1 USHER, M.J., BURCH, R.F. and GURALP, C.M., “Wide-band Feedback Seismometers”, 1979. Physics of the Earth and Planetary Interiors, 18: 38-50.
  • Ref 2 M,J, USHER and C.M. Guralp, “The design of miniature wideband seismometer” Geophys. J.R. ast. Soc. (1978)-55 (605-613) ,
  • Ref 3 GURALP, C.M., “The Design of a Three-component Borehole Seismometer”, 1980. Ph.D. Thesis, Univ of Reading.
  • Ref 4 GURALP C.M. Patent Application, No: 7909579 Filed: 19th March 1979 (declaration priority from Appln No: 10279/78 Filed: 15th March 1978) “Vertical Seismometer”.
  • Ref 5 GURALP C.M. United States Patent Application Number: 4,280.206 March 1979. SEISMOMETERS.
  • Ref 6 GURALP C.M. UK Patent Application GB 2-144-287-A. July 1983 Analog-to-digital converters for Seismometers. The National Research Development Corporation (UK)
  • Ref 7 GURALP C.M. UK Patent Application No. 1900719.4; Title: Infrasound Detector [M&S-IRN.FID4315516]