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Low Frequency Geophone 4.5Hz with Reinforced Land Case

Low Frequency Geophone 4.5Hz (ST-4.5N) is a long coil travel version geophone, which is equivalent to SM-6 B coil 4.5hz geophone. The extra coil travel offers an advantage for higher tilt requirements and where larger amplitude signals may be encountered, for example, in industrial vibration monitoring.

The ST-4.5N geophone can be supplied for vertial and horizontal orentation, which is an ideal choice for the shear-wave horizontal elements, partnering the ST-4.5N vertical geophone in a 3-component package.

  • Long travel version of the ST-4.5N geophone.
  • Reinforced land case equipped with steel spike with zinc coating.
  • Special orientations upon request beyond the normal vertical and horizontal options.
  • Widely used in structural and industrial vibration-monitoring systems.
  • Ideal choice for shear-wave horizontal elements.
  • Rugged construction with precious-metal, rotating-coil contacts.
  • Different type of geophone cases which are suitable for land,desert, snow, marsh and transition zone respectively.
  • 3-year limited warranty on basic element exclusive of high voltage, lightening or physical abuse.

We supply low frequency 4.5Hz geophone sensor, geophone element, land case geophone, 3 component and multi-geophone string with split spring connector, Mueller clip connector, 408 screw fit connector & push fit connector, KCK connector or Kooter connector. Lead wires from O.D 4.6mm to O.D 7.8mm available.

Customized geophone connectors and lead wires applicable upon request.

Click here and download data sheet of 4.5hz geophone or contact us to get special discounts.


For any inquiries, please contact with our Marketing Team at or Supporting Team at

Type ST-4.5N( Equivalent to SM-6 B-Coil 4.5hz )
Natural frequency ( Hz ) 4.5±10%
Damping 0.6±5%
Coil resistance (ohms) 375±5%
Open circuit sensitivity (V/m/s) 28.8±5%
Harmonic distortion ( % ) ≦0.2
Typical spurious Frequency ( Hz ) ≧160
Moving Mass ( g ) 11.3
Max.coil excursion p-p (mm) 4
Max.tilt angle 20º
Element Diameter (mm) 25.4
Element Height (mm) 36
Element Weight (g) 86
Operating Temperature( ℃ ) -40℃ to + 100℃
Warranty Period 3 years
●   All parameters specified herein are rated at a temperature 20℃±2℃.

●   3- year limited warranty on basic element exclusive of high voltage, lightening or physical abuse.

* Other type of geophones are also available: SM-4 equivalent, SM-6 equivalent, SM-24 equivalent, SG10 equivalent, GS-20DX equivalent, GS-32CT equivalent, GS ONE equivalent, 1Hz, 2Hz, 2.5Hz, 3Hz, 4Hz, 4.5Hz, 8Hz, 10Hz, 14Hz, 15Hz, 28Hz, 30Hz, 38Hz, 40Hz, 60Hz,80Hz and 100Hz geophones.

*  Specifications are subject to change without prior notice.

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