The World standard broadband-seismometer other seismo­meters are compared to, with very low noise, high clipping level, low power, and wide opera­tional tempe­rature range without adjustment.

A low tempe­rature version (down to -55°C) is available on request.


  • Performance equally to STS-2
  • Improved insensitivity to barometric pressure variation by a factor of 10 compared to STS-2
  • Serial interface for control and maintenance
  • Auxiliary signals switchable between mass-position and UVW-raw
  • Low power, less than 450 mW

STS-2.5 Operating Range


For more information (Instruction manual, nominal transfer function, Calibration sheet etc.) please consult the Kinemetrics support site. (Login required)


Sensor element arrangement

Galperin-type three components



Frequency Range

120 s (8.33 mHz)  - 50 Hz


1'500 Vs/m

Signal Outputs

Seismic Signals: ±20 V diffe­rential (40 Vpp), 220 Ω Impedance, Auxiliary signals: ±10 V single ended, 1 kΩ Impedance


Control lines (Fast Response, Calibration), POS/RAW), 3-30 V, 0.5 mA. Buttons for Lock/Unlock and Centering (Hostbox), RS-232 Interface

Power Supply

9-36 VDC, galva­nically isolated. 0.45 W typical, 2.0 W maximum

Tilt Range (operating)


Tilt Range (adjustable)

±5°, manually adjustable feet

Centering Range


No centering Temperature Range


Environmental Conditions

-20°C .. +70°C (performance), -40°C .. +70°C (functional), 0-100% RH


external hostbox. low temperature version available (-50°C).


Aluminum, IP-67

Size (∅ x h), Weight

235 mm x 260 mm, 12 kg (9.25" x 10.2", 26.4 lbs), 13 kg (28.6 lbs incl. accessories), same form factor as STS-2


STS-2.5, hostbox, orientation rod, instruction manual, cable 5 m (available: 3 m, 10 m, 15 m, 30 m, other lengths on request)

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