The VE-53-DH is a downhole, triaxial short period seismometer designed for seismic monitoring applications.
Based on a state of the art geophone mass-spring system with electronic feedback, the VE-53-DH seismometer is ideally suited for installations with low to moderate noise.
The VE-53-DH is housed in an extremely robust downhole housing of austenitic stainless steel.
Offering a remarkable stability under temperature fluctuations or against aging, the VE-53-DH also requires no mass locking due to the innovative design of the unit.
The VE-53-DH is equipped with electronic offset adjustment features that make its installation very user friendly. This powerful feature allows the users to install the VE-53-DH without mechanical offset adjustment and fine levelling.
The advanced iSensor™ interface allows easy deployment using built-in hardware like compass as well as tilt, temperature and humidity sensors.
The VE-53-DH seismometer is directly compatible with all GeoSIG solutions.
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General Characteristics
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| Configurations: |
Triaxial |
Biaxial |
Uniaxial |
Axes |
Alignment** |
| VE-53-DH-BB |
X |
|
|
X – Y – Z |
H – H – V |
| VE-53-DH |
X |
|
|
X – Y – Z |
H – H – V |
- ** H: Horizontal, V: Vertical
- Sensitivity:
- 1000 V/m/s differential ( 2 x 500 V/m/s )
- Full Scale Range:
- 20 mm/s (± 10 mm/s) nominal output
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Sensor Element
- Type:
- Over damped geophones
- Dynamic Range:
- > 125 dB (1 - 15 Hz)
> 120 dB (1 - 30 Hz)
- Non-linearity:
- ± 0.05 % of full scale maximum
- Cross Axis Sensitivity:
- ± 1 % typical, ± 3 % maximum
- Bandwidth:
- 1.1 s (0.9 Hz) to 89 Hz;
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:
- > M1 (Local - 10 Km) and
> M1.5 (Regional -100 Km)
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iSensor™ Interface
- iSensor™ interface is a state of the art innovative and proprietary hardware and software interface developed by GeoSIG, which allows through its special computer software, the operation, control, logging and data export for the built-in:
- compass
- tilt sensor
- temperature sensor
- humidity sensor
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Power
- Supply Voltage:
- 9 to 18 VDC
- Consumption:
- 60 mA typical, 100 mA max. @15 VDC
- Overvoltage Protection:
- All pins are protected
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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
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Environment/Housing
- Housing Type:
- Austenitic Stainless Steel
- Housing Size:
- 89 mm x 502 mm
- Weight:
- 7.5 kg (typical configuration)
- Index of Protection:
- Watertight up to 10 bar (100 m)
- Temperature Range:
- -20 to 70 °C (operating)
-40 to 75 °C (non-operating)
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Options
- Cable & connector:
- See separate document (GS_Sensor_Connector_Options)
- Surface control unit:
- iSensor interface
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Ordering Information
- Please specify:
- Type of VE-53-DH, full scale range, depth of deployment, cable length, and other applicable options
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**Specifications subject to change without notice
- Sensitivity 1000 V/m/s differential
- Built-in compass as well as tilt, temperature and humidity sensors
- Extremely robust downhole housing
- Suitable for borehole diameters of 100 mm and larger
- Proprietary iSensor™ interface
- Dynamic Range > 125 dB (0.9 - 15 Hz)
> 120 dB (0.9 - 30 Hz)
- Full Scale 20 mm/s (± 10 mm/s)
- Bandwidth 1 to 80 Hz (-3 dB) or 8.0 s (0.125 Hz) to 160 Hz (BB version)
