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20DX Geophone Sensor

20DX geophone sensor is a classic series of geophones which are specially designed for extensive field applications. 20DX series geophones are considered to be the most reliable &lowest costs options in geophysical field considering their stable structure and reliability performance in hazard field environments.

With the natural frequency options of 8Hz,10Hz, 14Hz, 28Hz, 40Hz, 60Hz or 100Hz, 20DX series geophones are suitable for assorted applications including but not limited to geophysical acquisition engineering monitoring, coil mine prospecting, security and industrial vibration monitoring.

  • Industry standard for cost effectiveness, quality and reliability.
  • Enhanced spurious response for full bandwidth at 2-ms sampling.
  • Available for vertical geophone and horizontal geophone for P wave, S wave and 3 component acquisition
  • Reinforced land and waterproof marsh case required no poting and provide easy access to basic units with lowest maintenance expenditures.
  • Standard natural frequency of 8Hz, 10Hz,14Hz,28Hz,40Hz,60Hz or 100Hz optional.
  • 3-year limited warranty on basic element exclusive of high voltage, lightning or physical abuse.

Click here and download data sheet of 20DX geophones or contact us and get more detailed information.

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Data Sheet of 20DX Series Geophone Sensor












ST-20DX 60hzST-20DX 100hz
Natural frequency ( Hz )8±5%10±5%14±5%28±5%40±5%60±5%100±5%
Open circuit damping0.38±5%0.30±5%0.22±5%0.27±5%0.37±5%0.52±5%0.45±5%
Damping with Shunt Resistor0.71±5%0.70±5%0.51±5%0.552±5%0.576±5%0.60±5%\
Calibration Shunt Resistance(ohms)180010001000100015001500\
Open Circuit Intrinsic Voltage Sensitivity(V/m/s)28.0±5%28.0±5%28.0±5%39.0±5%42.0±5%39.0±5%23.0±5%
Sensitivity with Shunt Resistor(V/m/s)23.0±5%20.0±5%20.0±5%28.0±5%30.4±5%27.0±5%\
Coil Resistance (ohms)395±5%395±5%395±5%395±5%575±5%668±5%570±5%
Harmonic Distortion ( % )≤0.2≤0.2≤0.2≤0.2≤0.2≤0.2≤0.2
Typical Spurious Frequency ( Hz )≥180≥200≥250≥350≥380≥400≥600
Moving Mass ( g )
Max.coil excursion p-p (mm)
Max.tilt angle20º20º20º20º20º20º20º
Element Diameter (mm)25.425.425.427.
Element Height (mm)33.5033.5033.5033.5033.5033.533.5
Element Weight (g)
Operating Temperature(℃)-45℃ to + 80℃45℃ to + 80℃45℃ to + 80℃45℃ to + 80℃45℃ to + 80℃45℃ to + 80℃45℃ to + 80℃
● All parameters specified herein are rated at a temperature 20℃±2℃.

● 3-year limited warranty exclusive of high voltage, lightening and physical abuse.

* Other Geophone Type are also Available: SM-4 equivalent, SM-6 equivalent, SM-24 equivalent, SG10 equivalent, GS-32CT equivalent, GS ONE equivalent, 1Hz, 2Hz, 2.5Hz, 3Hz,4Hz, 4.5Hz, 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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