PASI - Model GFA 50/100 - 3D Borehole Geophone - Datasheet

GFA 50/100 3D borehole geophone 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. You will simply have to connect the air pump to the GFA panel and you will be ready to operate in the field: by inflating air at 2- 3 bars, you will obtain the best coupling of the sensors to the borehole wall (diameter between 50 and 110mm. if used with the standard spacer block).