Force Balanced Mini Broadband Seismometer
seismometer seismini

The SEISMINI represents the new generation of low noise MINI broadband seismometers equally suitable for stationary, field and OBS (reduced power version) applications.

The sensor's advanced force-balancing feedback provides for an extended dynamic range, excellent stability and linearity across the entire passband. This instrument uses three proprietary electrochemical transducers with identical responses mounted orthogonally along the N, E, and Z-axes. These transducers have many advantages over traditional electromechanical sensors. In particular, they have much larger ground motion-to-voltage conversion ratio that results in a uniquely shaped noise curve that is essentially flat from several Hertz to the longest periods.

Like our other seismometers, the SEISMINI is extremely rugged which makes it ideal for field use. This seismometer does not require a mass lock, mass centering, or special installation equipment or procedures. It has low power consumption, operates over a wide temperature range; is waterproof up to the one-meter depths, and stays operational within a wide range of installation tilts. It provides low cost of ownership, requiring no maintenance over the life of the instrument. Options include a (4-inch diameter) posthole package, with internal inclinometers. Three and five-year extended warranties are available.

  • Passband 0.0167 Hz to 50-100 Hz, Optional 0.01 Hz and 0.0083 Hz
  • Low Power
  • No Mass Centering or Mass Locks
  • High Sensitivity
  • 150dB Dynamic Range
  • Rugged
  • Maintenance Free
  • Waterproof
  • Operates over a wide tilt
  • Flat Frequency Response
  • Force Balanced
  • OBS and Borehole Configurations
  • Calibration Inputs
Operating principle: Electrochemical motion transducer with force-balancing feedback
Output signals: 2 horizontal, 1 vertical; very broad passband, velocity flat response
Output signal swing: 10 V (20 V p-p)
Dynamic Range: 150 dB @ 1Hz
Bandwidth: Standard: 0.0167 - 50 Hz; Optional.: 0.01, 0.0083- 50 or 100Hz
Generator constant: Standard: 2000 V/m/s; Opt.: 350 - 20,000 V/m/s
Calibration input 1kohm; 1V in - 1V out;
Mass Centering: NONE REQUIRED
Maximum installation tilt 15
Mechanical resonance >400 Hz
Waterproof: Submersible (1m)
Temperature range: Standard: -15 to + 60 C
Others optional
Basic SEISMINI Configuration The standard configuration includes mating connector and calibration sheets
Extended Period

option -01Hz or -0083Hz

Sensitivity Option option -Sxxxxx
(x specifies sensitivity)
Case Option Specify
Recorder Options DR-5000,
Supplies and Accessories Sensor Cable
General Spares None

S Printer Friendly Format For Specifications

Case dimensions 120x120x100 mm
Weight (Aluminum housing) 1.4 kg
Connector 14-pin circular
Power - Standard 10 - 18 Vdc; 12 Vdc nominal
Supply current Standard: 30 mA; LP version: 10mA


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