3D geophone GFA-50/100

for boreholes

GFA 50/100 3D borehole geo-phone is realized with 3x high sensitive geophones (nat.freq.10 Hz- 1 vertical and 2 horizontal sensors) oriented according to a triad of orthogonal Cartesian axes XYZ. Delivered with a cleat assembly to sustain its weight at the requested depth (GFA cable is graduated in meters), this borehole geophone has a pneumatic-mechanical clamping system. Applications: DOWN HOLE / CROSSHOLE / Vs30 -3 x 10 Hz geophones (1vert.+2horiz.) -cable length 50 or 100m, graduation 1 meter -for boreholes with diameter from 50 and 110mm (larger diam. on request) -probe dimensions: diam. 50mm, length 570mm -cable reel dimensions: 540x400x250mm -total weight (reel+cable+probe): less then 12 kg for Mod. GFA-50 -Cannon NK2721C or Souriau connector (other on request) -cable reel with 50/100 m of cable -pneumatic-mechanical clamping (with manual pump included) -air purge valve