| Customization: | Available |
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| Accuracy: | <1mm |
| Horizontal Line: | 1 |
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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 options 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.
| Type | ST-20DX 8hz |
ST-20DX 10hz |
ST-20DX 14hz |
ST-20DX 28hz |
ST-20DX 40hz |
ST-20DX 60hz | ST-20DX 100hz |
| Natural frequency ( Hz ) | 8±5% | 10±5% | 14±5% | 28±5% | 40±5% | 60±5% | 100±5% |
| Open circuit damping | 0.38±5% | 0.30±5% | 0.22±5% | 0.27±5% | 0.37±5% | 0.52±5% | 0.45±5% |
| Damping with Shunt Resistor | 0.71±5% | 0.70±5% | 0.51±5% | 0.552±5% | 0.576±5% | 0.60±5% | \ |
| Calibration Shunt Resistance(ohms) | 1800 | 1000 | 1000 | 1000 | 1500 | 1500 | \ |
| 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 ) | 11.0 | 11.0 | 11.0 | 11.0 | 8.20 | 6.5 | 5.0 |
| Max.coil excursion p-p (mm) | 1.5 | 1.5 | 1.5 | 1.5 | 1.50 | 1.5 | 1.5 |
| Max.tilt angle | 20º | 20º | 20º | 20º | 20º | 20º | 20º |
| Element Diameter (mm) | 25.4 | 25.4 | 25.4 | 27.0 | 27.0 | 27.0 | 27.0 |
| Element Height (mm) | 33.50 | 33.50 | 33.50 | 33.50 | 33.50 | 33.5 | 33.5 |
| Element Weight (g) | 87.0 | 87.0 | 87.0 | 100.0 | 95.0 | 95.0 | 95.0 |
| Operating Temperature(ºC) | -45ºC to + 80ºC | 45ºC to + 80ºC | 45ºC to + 80ºC | 45ºC to + 80ºC | 45ºC to + 80ºC | 45ºC to + 80ºC | 45ºC to + 80ºC |
| - All parameters specified herein are rated at a temperature 20ºC±2ºC. - 3-year limited warranty exclusive of high voltage, lightening and physical abuse. |
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