Borehole Seismometers
Productr Details :
Borehole Seismometer Extreme Condition: Model G88-4.5
High-pressure and high-temperature borehole seismometer for micro-earthquake monitoring.
The G88-4.5 is a triaxial borehole seismometer which combines robust construction and high-temperature tolerance. Deployed in more than 150 boreholes around the world in settings from geothermal monitoring to hydraulic fracturing. The design results in a long life span with some instruments currently operating after 20 years of deployment. All three orthogonal components are gimbaled to give a borehole deviation tolerance of 14°. The G88-4.5 is purpose built for long term or permanent installation in high-pressure hostile borehole environments. An alternate model, the G88-2.0 offers a lower corner frequency in exchange for a lower temperature tolerance.
Features:
- Fully gimbaled, 14° maximum tilt
- Withstands up to 150 °C
- Passive sensors
- For permanent or semi-permanent installations
- Custom versions can include accelerometers, magnetometers etc
G88-4.5 Borehole Seismometer Specifications
Geophone Parameter | Specifications |
|---|---|
Sensor Configuration: | Triaxial, Orthogonal |
Natural Frequency: | 4.5 Hz |
Operational Temperature: | -45°C to 150°C |
Geophone Tilt Tolerance: | Vert: ± 15, Horiz: ± 2° |
DC Resistance: | 3,810 Ω |
Sensitivity: | 0.787 V/cm/s |
Transduction Constant: | 0.0128 √Rc V/cm/s |
Open Circuit Damping: | 0.27 |
Moving Mass: | 23 g |
Max Coil Excursion p-p: | 0.76 cm |
Borehole Seismometer Observatory Grade: Model G88-2.0
High-pressure and low-frequency borehole seismometer for micro-earthquake monitoring.
The G88-2.0 is a triaxial borehole seismometer which combines robust construction and low corner frequency. Deployed in more than 150 boreholes around the world in settings from geothermal monitoring to hydraulic fracturing. The design results in a long life span with some instruments currently operating after 20 years of deployment. All three orthogonal components are gimbaled to give a borehole deviation tolerance of 12.5°. The G88-2.0 is purpose built for long term or permanent installation in high-pressure hostile borehole environments. An alternate model, the G88-4.5 offers a higher temperature tolerance in exchange for a higher corner frequency.
Features:
- Fully gimbaled, 12.5° maximum tilt
- Withstands up to 100 °C (frequency changes > 50 °C)
- Passive sensors
- For permanent or semi-permanent installations
- Custom versions can include accelerometers, magnetometers etc
G88-2.0 Borehole Seismometer Specifications
Geophone Parameter | Specifications |
|---|---|
Sensor Configuration: | Triaxial, Orthogonal |
Natural Frequency: | 2.0 Hz |
Operational Temperature: | -45°C to 100°C |
Geophone Tilt Tolerance: | Vert: ± 7.5, Horiz: ± 2° |
DC Resistance: | 3,810 Ω |
Sensitivity: | 0.787 V/cm/s |
Transduction Constant: | 0.0126 √Rc V/cm/s |
Open Circuit Damping: | 0.61 |
Moving Mass: | 23 g |
Max Coil Excursion p-p: | 0.76 cm |
Housing Parameter | Specifications |
|---|---|
Operational Pressure: | 33.3 Mpa |
Gimbal Tilt Range: | ± 12° |
Outer Diameter: | Ø 88 mm |
Wall Thickness: | 5.3 mm |
Height: | 930 mm |
Weight: | 20 Kg |
Casing Material | SS 316L |
Borehole Seismometer Observatory Grade: Model G110-1.0
High-pressure and low-frequency borehole seismometer for micro-earthquake monitoring.
The G110-1.0 is a single axis borehole seismometer which combines low corner frequency with the highest in-class performance level in sensitivity, reliability and longevity for micro-earthquake detection. Designed around the tried and true Mark L4C and optimised for earthquake detection and analysis it consists of a solely vertical component version of the fully triaxial seismometer G202-1.0. The geophone is gimbaled to give a borehole deviation tolerance of 9°. Represents 20 years of instrument development experience at IESE, the G110-1.0 is purpose built for long term or permanent installation in high-pressure hostile borehole environments.
Features:
- Fully gimbaled, 9° maximum tilt
- Withstands up to 60 °C
- Passive sensors
- For permanent or semi-permanent installations
G110-1.0 Borehole Seismometer Specifications
Geophone Parameter | Specifications |
|---|---|
Sensor Configuration: | Verticle |
Natural Frequency: | 1.0 Hz |
Operational Temperature: | -29°C to 60°C |
Geophone Tilt Tolerance: | ± 5° |
DC Resistance: | 5,500 Ω |
Sensitivity: | 2.77 V/cm/s |
Transduction Constant: | 0.0373 √Rc V/cm/s |
Open Circuit Damping: | 0.28 |
Moving Mass: | 1,000 g |
Max Coil Excursion p-p: | 0.635 cm |
Housing Parameter | Specifications |
|---|---|
Operational Pressure: | 33.3 Mpa |
Gimbal Tilt Range: | ± 4° |
Outer Diameter: | Ø 110 mm |
Wall Thickness: | 3.9 mm |
Height: | 672 mm |
Weight: | 20 Kg |
Casing Material | SS 316L |
Borehole Seismometer Observatory Grade: Model G202-1.0
High-pressure and low-frequency borehole seismometer for micro-earthquake monitoring.
The G202-1.0 is a triaxial borehole seismometer which combines low corner frequency with the highest in-class performance level in sensitivity, reliability and longevity for micro-earthquake detection. Designed around the tried and true Mark L4C and optimised for earthquake detection and analysis it consists three orthogonal components which are gimbaled to give a borehole deviation tolerance of 10.5°. The G202-1.0 represents 20 years of instrument development experience at IESE, and it is purpose built for long term or permanent installation in high-pressure hostile borehole environments. A single component G110-1.0 model is also available.
Features:
- Fully gimbaled, 10.5° maximum tilt
- Withstands up to 60 °C
- Passive sensors
- For permanent or semi-permanent installations
G202-1.0 Borehole Seismometer Specifications
Geophone Parameter | Specifications |
|---|---|
Sensor Configuration: | Triaxial, Orthogonal |
Natural Frequency: | 1.0 Hz |
Operational Temperature: | -29°C to 60°C |
Geophone Tilt Tolerance: | Vert: ± 5°, Hor: ± 0.5° |
DC Resistance: | 5,500 Ω |
Sensitivity: | 2.77 V/cm/s |
Transduction Constant: | 0.0373 √Rc V/cm/s |
Open Circuit Damping: | 0.28 |
Moving Mass: | 1,000 g |
Max Coil Excursion p-p: | Borehole Seismometers
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