Reinforced Land Cased Geophone 28Hz(P/N: ST-20DX,28Hz) is an ideal choice for shallow seismic survey and it is mostly widely used in coalmine geological prospecting and exploration with the following features:
We supply reinforced land cased geophone 28Hz coil, geophone element, geophone sensor, single geophone, geophone array and multi geophone string with KCK connector, KCL connector, 408 connector, Kooter connector, MP16 connector, Split spring connector and Mueller clip connector optional as the lead connector. Geophone leader cable from O.D 4.6mm to O.D 7.8mm available.
Click here and download data sheet of 28hz geophones or contact us to get special discounts.
(Equivalent to SM-4,28hz)
(Equivalent to GS-20DX,28hz)
|Natural frequency ( Hz )||28 ± 5%||28±5%|
|Open circuit damping||0.6||0.22|
|Damping with Shunt Resistor||0.634 ± 5%||0.552±5%|
|Open Circuit Intrinsic Voltage Sensitivity(V/m/s)||31.0||39.0|
|Sensitivity with Shunt Resistor(V/m/s)||29.5 ± 5%||28.0±5%|
|Coil Resistance (ohms)||385 ± 5%||395±5%|
|Harmonic Distortion ( % )||＜0.2||≤0.2|
|Typical Spurious Frequency ( Hz )||≧300||≥350|
|Moving Mass ( g )||10.2||11.0|
|Max.coil excursion p-p (mm)||1.6||1.5|
|Element Diameter (mm)||26||25.4|
|Element Height (mm)||32||33.5|
|Element Weight (g)||80||87.0|
|Operating Temperature(℃)||-40℃ to + 100℃||–45℃ to + 100℃|
|Warranty Period||3 years||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, 5Hz,8Hz, 10Hz, 14Hz, 15Hz, 28Hz, 30Hz, 38Hz, 40Hz, 60Hz,80Hz and 100Hz.