Profound reserves the right to revise this documentation or to make improvements
or changes in the product(s) at any time.
VIBRA geophone cone
Profound VIBRA geophone cone
The Profound geophone cone for the VIBRA
range has been designed for high-
performance ground vibration monitoring,
measuring dynamic soil parameters.
Installation of the geophone cone with
standard cone penetration rods can be done
by pushing it to the desired depth. When the
desired depth has been reached, the rod is
slightly retracted to minimise the vibration
influence of the penetration rods.
Digital ID
The geophone cone has an electronic
datasheet including the serial number.
Therefore, the source of measurement data
can always be traced.
High-performance
Besides continuously monitoring the x-, y-
and z-direction, the VIBRA also automatically
corrects the measurement data for the
individual sensitivity of each geophone
channel. This guarantees high-quality
measurements and performance.
VIBRA
+
The VIBRA geophone cone in combination
with the VIBRA
+
offers the following extras:
- Detection of the geophone's inclination,
assuring that measurements are carried
out with a correctly positioned
geophone.
- Based on data from the electronic
datasheet, the VIBRA
+
not only corrects
the sensitivity, but also the resonance
frequency and the quality factor with the
help of digital correction filters.
VIB.00350 VIBRA geophone cone
Channels 3 (X-, Y-, Z-direction)
Sensitivity (typical) 23.3 Vs/m
Resonance frequency (f
res
)
8 Hz ± 0.5 Hz
Output Resistance (Rout) 330 Ohm
Quality factor (Q) 0.75
Distortion at 18 mm/s and 12 Hz < 0.2 %
f
res
within tolerance
< 15º
Max. inclination ≤ 5º
Electronic datasheet (ID) Serial number; calibration date;
sensitivity; f
res
; R
out
;
Q
Protection rating IP66 according to
DIN 40 050/IEC 529
Material 42CrMo4V
Density 4500 kg/m
3
Cone diameter Ø 49.5 mm
Cone length 190 mm
Mass 1.280 kg
Moving mass 11 ± 0.5 g (each channel)
Screw thread GeoMil standard for CPT tubes
VIBRA connector LEMO K Series
Cable length 10 m cable
Accessory VIB.00320 cable reel 50 m
P.O. Box 469 Tel. + 31 182 - 640 964
2740 AL Waddinxveen info@profound.nl
The Netherlands www.profound.nl
VIB035/11/2007
Profound Vibration Monitoring
10
0
10
1
10
2
10
0
10
1
10
2
MEASURING RANGE V IBRA
frequency [Hz]
velocity [mm/s]
Geophone f= 8 Hz Q=0.707
DIN 45669-1 calibration point
DIN 45669-2 free standing geophone a < 3m/s
2
and f < 100 Hz
Geophone displacement limit 0.8 mm
Geophone displacement limit 0.8 mm inclination 5 degrees
Vibra v
max
= 100 mm/s u
max
< 0.8 mm
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