Low frequency land case geophone 4Hz (ST-4) is a long coil travel version 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.
● Special orientations upon request beyond the normal vertical and horizontal options.
● 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.
● Widely used in structural and industrial vibration monitoring system.
We supply low frequency 4Hz geophone coil, geophone element, land case geophone, 3-component geophone and multi-geophone string with split spring connector, Mueller clip connector, 408 screw fit connector & push fit connector, KCK connector and KCL connector optional. Lead wires from O.D 4.6mm to O.D 7.8mm available.
Customized geophone connector and lead wire are applicable upon request.
Click here and download data sheet of 4hz geophone or contact us to get special discounts.
|Natural Frequency ( Hz )||4±10%|
|Sensitivity/G ( V/cm.s-1 )||0.28±5%|
|Coil Resistance/ Rc( Ω )||380±5%|
|Internal Resistance/ R( Ω )||345±5%|
|Damping Coefficient Bt||0.7±10%|
|Harmonic Distortion D ( % )||≦0.2|
|Insulating Resistance Ri ( MΩ )||≧20|
|Coil’s Maximum Displacement /P-P ( mm )||2|
|Suspension Mass( g )||13|
|Element Diameter ( mm )||27.2|
|Element Height ( mm )||34|
|Element Weight ( g )||85|
|Working Temperature( ℃ )||-40℃ to + 70℃|
|● All parameters specified herein are rated at a temperature 20℃±2℃
● 1- 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-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.