VE-5x-DH Seismometer

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