20dx Geophone Sensor for Coal Mine Prospecting and Industrial Vibration Monitoring

• After-sales Service: Available
• Warranty: 3 Year
• Accuracy: <1mm
• Shipping Cost: Estimated freight per unit.: about shipping cost and estimated delivery time.
• Currency: US$
• Return&refunds: You can apply for a refund up to 30 days after receipt of the products.
• Model NO.: 20dx geophone
• Vertical Lines: 1
• Horizontal Line: 1
• Natural Frequency: From 8Hz to 100Hz Available
• Geophone Direction: Vertical, Horizotnal or 3c Optional
• Typical Spurious Frequency: Greater Than 250Hz
• Data Tolerance: 5%
• Geophone Case: Reinforced Land Case or Marsh Case
• Geophone Spike: 75mm Steel Soil Spike or Brass Marsh Spike
• Leader in Cable Od: 4.6mm to 7.8mm Available
• Warranty Period: 3-Year
• Transport Package: Standard Export Carton
• Specification: Vertical / Horizontal
• Trademark: SEIS TECH
• Origin: China
• HS Code: 9015800090
• Production Capacity: 500, 000.00/Year
• Package Size: 20.00cm * 10.00cm * 5.00cm
• Package Gross Weight: 0.090kg

Product Description

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.