GeoSIG VE-5x-DH Seismometer

Key Features

  • Sensitivity      1000 V/m/s differential
  • Bandwidth       1.1 s (0.9 Hz) to 89 Hz
  • Dynamic Range   > 125 dB (0.9 - 15 Hz)
                                   > 120 dB (0.9 - 30 Hz)
  • Robust mechanical design
  • Excellent temperature and aging stability
  • Low power consumption
  • Easy testing, low maintenance
  • Fits into small diameter boreholes 
VE-5x-DH Seismometer


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The VE-5x, now a legacy product, was a triaxial short period seismometer designed for seismic monitoring applications.
The VE-5x seismometer was based on a state of the art geophone mass-spring system with electronic feedback which offered a remarkable stability under temperature fluctuations or against aging. In addition, due to the innovative design of the unit, no mass locking was required.
With the help of the TEST LINE the VE-5x-DH seismometer could be completely tested assuring proper operation.
The downhole housing contained the entire sensor system. The sensor was connected through an Overvoltage Protection stage to the recorder at the surface with a cable.
By using inclinometer tubes and the provided guide wheels, the sensor could be oriented before insertion in the hole.


 

  • General Characteristics

  •  
    Configurations: Triaxial Biaxial Uniaxial Axes Alignment**
    VE-53-DH X     X – Y – Z H – H – V
    VE-52-DH-H   X   X – Y H – H
    VE-52-DH-HV   X   X (or Y) – Z H – V
    VE-51-DH-H     X X (or Y) H
    VE-51-DH-V     X Z V
  • ** H: Horizontal, V: Vertical
  • Sensitivity:
  • 1000 V/m/s differential
  • Full Scale Range
  • 10 mm/s nominal output

  • Sensor Element

  • Dynamic Range:
  • > 125 dB (1 to 15 Hz)
    > 120 dB (1 to 30 Hz)
  • Linearity:
  • ± 0.05 % of full scale maximum
  • Cross Axis Sensitivity:
  • ± 1 % typical
    ± 3 % maximum
  • Bandwidth:
  • 1 to 80 Hz (-3 dB)
    8.0 s (0.125 Hz) to 160 Hz (BB version)
    flat response within -3 dB crossing points
  • Damping
  • 0.7 critical
  • Full Scale Output:
  • 0 ± 10 V differential
    optional 0 ± 5 V pseudo-differential
  • Measuring Range* (see plot):
  • > M1 (Local - 10 Km) and
    > M1.5 (Regional -100 Km)

  • Power

  • Supply voltage:
  • 9 to 18 VDC
  • Power Consumption:
  • 70 mA at 12 VDC
  • Overvoltage Protection:
  • All pins are protected

  • Testing

  • Test input:
  • Activated by applying a 12 VDC voltage
    to generate an output of a pulse with an
    amplitude of 50% of the full scale

  • Environment/Housing

  • Housing Type:
  • Aluminium cylinder, fully sealed
  • Housing Size:
  • Diameter 54 mm, length 420 mm
  • Weight:
  • 3.5 kg
  • Index of Protection:
  • IP 68, up to 10 bar water pressure
  • Temperature Range:
  • - 40 to 85 °C (operating)
    - 40 to 85 °C (non-operating)
  • Humidity:
  • 0 to 100 %)
  • Orientation:
  • Using 3” inclinometer casing (Photo 1) with included guidewheels (Photo 2).

  • Standard VE-53-DH

  • User specified cable already mounted, includes recorder mating connector if delivered with a GeoSIG recorder

  • Standard VE-53-DH

  • Cable & connector:
  • See separate document
    (GS_Sensor_Connector_Options)

  • Accessories

  • DH-TUBE:
  • 3” inclinometer casing as in Photo 1 in sections of 3 meters with coupling elements.
  • Installation kit:
  • All required tools and fixation consumables for up to 100 meters of casing.

  • Ordering Information

  • Please specify the depth of borehole and total cable length, required accessories, and other applicable options
  •    

  • * The BB version is not available as downhole version.

    **Specifications subject to change without notice